Simple Power Op Amp Solutions

PowerAmp DesignSimple Power Op Amp Solutions

Power Op Amps Evaluation Kits Accessory Modules Full Line Catalog v4.0PowerAmp Design 3381 W Vision Dr Tucson AZ 85742 USA Tel 520 579-3441 Fax 208 279-5458

www.PowerAmpDesign.net

An Introduction to Power Amp DesignPower Amp Design specializes in high power operational amplifiers for industrial applications. With a new concept for component amplifiers, these power op amp designs feature surface mount component construction on an insulated metal substrate. An integral heat sink and fan provide optimum cooling. The new approach decreases weight and system complexity while increasing power density. Unique and compact turn-key solutions result for many high power industrial amplifier applications. These power op amp designs operate as simply as IC op amps but at far higher power levels. Power Amp Design evolved from a custom amplifier design consulting business into a catalog products business while accumulating over two decades of engineering experience in high current power amplifiers with outputs as high as 50 amps and high voltage amplifiers with outputs up to 2000 volts. Applications served by our amplifiers are as diverse as motor drives and scanning tunneling microscope transducer drives. Typical applications for amplifiers by Power Amp Design include: Sonar transducer drive Ink jet printer head drive MRI Scanning tunneling microscopes Surface scanners Magnetic deflection Motor drive Deformable mirror telescopes Mass spectrometers ATE pin drivers Vibration cancelling amplifiers Semiconductor production equipment Ultra-sound transducer drive

Power Amp Design continues to offer an expanding choice of catalog products, but can also design custom amplifiers for your application, as well as modify existing designs to meet your specific requirements. For custom installations, most amplifier models are available without the heat sink and fan or can be supplied mounted to a passive heat sink. All products are manufactured in an ISO9001 facility. Each catalog product is supported by an evaluation kit, accessory modules that can modify and enhance the performance of the basic amplifier, SPICE models for your circuit simulator and application articles to expand on data sheet information. And all products are supported expert applications assistance.

NEW IN THIS CATALOG ISSUE v4.0This issue includes several important changes to our catalog. Our application notes have been collected into a library document and are now separate from our catalog of products. The Application Notes Library can now be downloaded separately from the catalog of products. Our new line of compact power op amps is expanded with the low cost 100V, 5Amp, model PAD541 in a SIP package. The PAD541 has a height similar to the industry standard TO220 package used for monolithic amplifiers but the PAD541 outperforms those products. The PAD541 is useful in applications where motherboards are side by side in a card cage and board-to-board spacing is critical. Although most of our products are offered without the integrated heat sink and fan cooling for custom applications, the compact line specifies most products both with and without the heat sink and fan. The versions without the heat sink and fan are denoted by the -1 suffix. Check out the compact line of amplifiers and also the compact prices. We have consolidated our line of evaluation kits. Several of the evaluation kit models have been upgraded and modified to service several amplifier models. For example, the EVAL118 evaluation kit now services the PAD115, PAD118 and PAD119 model amplifiers. The upgrades make the evaluation kits easier to use and faster to build your application circuits. More kits now also include support for more of our accessory modules, allowing you to evaluate the amplifier/accessory module combination as well. We have also made changes to our accessory module line. The PAD125 Current Limit Accessory Module now replaces the PAD121 and PAD123 Current Limit Accessory Modules. The PAD125 covers the entire range the 8V to 250V and so covers amplifiers with supply voltages up to 500V total. Our rail to rail amplifier product line has also changed. The PAD117A replaces the PAD117 and PAD116 and matches the performance of both models in one new model. The A version of the PAD117 includes a supply voltage range down to 5V with an output of 10A. We have added another RRIO model also. The new PAD137 has similar AC performance to the PAD117A but with a higher power dissipation rating of 140W, a 40% improvement over the PAD117A. And finally, we have introduced the PAD38 and PAD39 power op amps. The PAD38 and PAD39 provide a form, fit and function second-source for the industrys MP38 and MP39 amplifiers respectively.

Contacts:Distributors:

EuropeCondatas Rietbachstrasse 7 8952 Schlieren Schweiz/ Switzerland Tel: +41 (0) 44 730 33 53 Fax: +41 (0) 44 730 33 63 [email protected] www.Condatas.com

Israel

Boran P.O. Box 2627 18 Hashacham St Petah-Tikva 49125 Israel email: [email protected] www.boran.co.il Tel: 972-3-9274747 Fax: 972-3-9274741

Japan

SEIWA Co. Matsumon Bldg2, 4-255 Ohmiya-cho Nara-City, Nara, Japan 630-8115 [email protected] www.seiwa-jp.com Tel: +81 742 35 9277 Fax: +81 742 35 9278

Singapore, Malaysia, Indonesia, Thailand, Philippines, Vietnam & India:

Champ Electronics 16 New Industrial Road #02-01/02 Hudson Techno Centre Singapore 536204 [email protected] www.champ.com.sg Tel: +65 6274 7488 Fax: +65 6271 6988

Representatives:

Texas, Oklahoma, Arkansas, Louisiana, Mexico

AID Electronics, Inc 2418 Marsh Lane, Suite 102, Carrollton, TX 75006 Tel: 972 478-8700, 800-669-4761 Fax: 972-478-8707 [email protected] www.aidelect.com

Massachusetts, New Hampshire, Connecticut, Rhode Island, Vermont, Maine

Crawford Associates 378 South Main Street Bradford, MA 01835 Tel: 978 374 9200 FAX: 978 374 9696 [email protected] www.crawfordassoc.com Other areas in USA and Worldwide Contact Factory For Pricing and Delivery [email protected]

Terms of SalesProduct Warranty The warranty period for Power Amp Design products is 2 years from the invoice date. During this time period Power Amp Design will, at Power Amp Design's discretion, either repair or replace defective product, or refund the purchase price of product that is found by Power Amp Design to be defective by reason of defective components, workmanship or manufacturing processes. The warranty does not include fitness for use determination or product which is found to be defective by means of abuse, neglect, misapplication or any other conditions not covered by the product's specification data sheet. Power Amp Design is not liable for loss of anticipated profits, consequential damages, loss of time or losses incurred by the customer in connection with the purchase or use of its products.Shipment Options Items are shipped F.O.B. Tucson, Arizona, USA and are insured for the value of the shipment. Shipping are usually made via UPS, Federal Express, USPS, and DHL. We can ship via other carriers as requested. Shipping costs are determined and added into the final price. Customers can have shipping costs charged to their own carrier accounts if requested at time of ordering. In most cases, Power Amp Design will prepare the necessary export documentation at no charge, however, any import fees, taxes or other customs requirements are the sole responsibility of the customer. Back-ordered Items We attempt to keep a reasonable stock of all our products available for immediate shipment. In the event that an item is temporarily out of stock, it will be backordered and shipped when available. The customer has the choice of shipping those items which are currently available immediately or holding the entire order until it can be shipped complete. Order Cancellation Purchase orders for standard products which were in stock and at the quantity requested when the order was placed can be cancelled prior to shipment without incurring any re-stocking charge or other penalty. Scheduled orders can be cancelled. However, any quantity discounts already received based on a previously agreed upon schedule of shipments will be back charged to the appropriate discount level. Orders for custom manufactured products and services may be cancelled prior to completion. However, the customer will be charged a cancellation penalty as well as all related engineering, NRE, material and incidental costs which have accumulated. Sales and Use Taxes For orders shipped within the state of Arizona, customers must pay sales tax unless there is a valid Arizona Transaction Privilege Tax Exemption Certificate on file with Power Amp Design before the sale. A similar form must be filed with us from other states for which Arizona requires that we collect sales tax on orders originating in Arizona. The necessary tax will be calculated and automatically added into the final price. Customers outside Arizona are responsible for paying any taxes your state or country requires. Return of Merchandise Items purchased of 25 pieces or less per model number may be returned without incurring any re-stocking charge or other penalty if returned complete in unopened cartons and in original condition. All other returns will be accepted only with prior approval from Power Amp Design and may be subject to a 20% re-stocking charge. In general, custom or large orders of 100 pieces or more per model number cannot be returned. Items used, modified, damaged or incomplete are not returnable. Power Amp Design reserves the right to refuse any return. An R.M.A. number must be obtained from our sales department to expedite the return process. Long-Term Availability Power Amp Design is committed to providing long-term availability of all our products. We work closely with our vendors to insure component availability. Whenever possible we design using components that are available from multiple sources. In situations where a component does become obsolete we strive to design a form, fit, and function replacement. Medical Applications Policy Power Amp Designs products are not authorized for use as critical elements in life support devices or systems. Fitness for use of our products in medical applications is strictly the responsibility of the designer of the device or system utilizing any Power Amp Design product.

Power Amp DesignPower Op Amps

500PAD113 PAD126

Total Supply Voltage (Volts)

400

PAD183

PAD115

300

PAD135

PAD38

PAD129

PAD119

200PAD20 PAD112 PAD541 PAD39

PAD137 PAD117A PAD128

PAD127 PAD118

100 0 5 10 15 20 25 30

Continuous Current (Amps)

PowerAmp DesignCOMPACT HIGH VOLTAGE OP AMPKEY FEATURES

PAD20Rev C

LOW COST HIGH VOLTAGE 150 VOLTS HIGH OUTPUT CURRENT 5A 40 WATT DISSIPATION CAPABILITY 80 WATT OUTPUT CAPABILITY INTEGRATED HEAT SINK AND FAN SMALL SIZE 40mm SQUARE

PowerAmp Design

APPLICATIONS SMALL MOTOR DRIVE HIGH VOLTAGE INSTRUMENTATION SEMICONDUCTOR TESTING

PAD20

PAD20-1

PAD20 COMPACT HIGH VOLTAGE OP AMP

DESCRIPTIONThe PAD20 high voltage operational amplifier is constructed with surface mount components to provide a low cost solution for many industrial applications. With a footprint only 40mm square, similar to the footprint of the TO3 hybrid package, the PAD20 offers outstanding performance that outperforms the more expensive hybrid amplifiers. External compensation tailors the amplifiers response to the application requirements. Fourwire programmable current limit is built-in. The PAD20 also features a substrate temperature reporting output and over-temp shutdown. The amplifier circuitry is built on a thermally conductive but electrically insulating metal substrate mounted to an integrated heat sink and fan assembly. No BeO is used in the PAD20. The PAD20-1 is also available without the integrated heat sink and fan for custom applications.

PAD20 INSTALLED IN EVALUATION KIT

A NEW CONCEPTA critical task in any power amplifier application is cooling the amplifier. Until now component amplifier manufacturers often treated this task as an after-thought, left for the user to figure out. At Power Amp Design the best heat sink and fan is chosen at the start and becomes an integral part of the overall amplifier design. The result is the most compact and volumetric efficient design combination at the lowest cost. In addition, this integrated solution concept offers an achievable real-world power dissipation rating, not the ideal rating usually cited when the amplifier case is somehow kept at 25oC. The user no longer needs to specify, procure or assemble separate components.

Power Amp Design

3381 W Vision Dr

Tucson AZ 85742

USA Phone (520)579-3441

Fax (208)279-5458

Web Site: www.PowerAmpDesign.net

COMPACT HIGH VOLTAGE OP AMP

PAD20CIRCUIT & CONNECTIONS

EQUIVALENT CIRCUIT

PowerAmp Design PAD20 COMPACT HIGH VOLTAGE OP AMP

PINOUT & CONNECTIONSCc 3 2 1 6 4 5 AC Cc1 Cc2 OUT +VS GND SUB C1

VIEW FROM COMPONENT SIDERS -IN +IN IC +IL -IL SD TMP -VS 7 8 14 13 12 11 10 9 * * * C2

TO FEEDBACK & LOAD

PHASE COMPENSATION GAIN Cc 1 470pF > 2 220pF > 10 68pF > 20 47pF

SLEW RATE 1V/uS 2V/uS 5V/uS 6V/uS * SEE APPLICATION CIRCUITS FOR OTHER CONNECTIONS AND FUNCTIONS.

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PAD20 COMPACT HIGH VOLTAGE OP AMPSUPPLY VOLTAGE, +Vs to Vs4 150V INPUT VOLTAGE +Vs to Vs 20V DIFFERENTIAL INPUT VOLTAGE OUTPUT CURRENT, peak, within SOA 7A POWER DISSIPATION, internal, DC 40W

ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS

__________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSTEMPERATURE, pin solder, 10s, 300C 150C TEMPERATURE, junction2 TEMPERATURE RANGE, storage 40 to 70C5 TEMPERATURE RANGE, storage, PAD20-1 105C OPERATING TEMPERATURE, substrate 40 to 105C

PowerAmp Design

PARAMETERINPUTOFFSET VOLTAGE OFFSET VOLTAGE vs. temperature OFFSET VOLTAGE vs. supply 3 BIAS CURRENT, initial BIAS CURRENT vs. supply OFFSET CURRENT, initial INPUT RESISTANCE, DC INPUT CAPACITANCE COMMON MODE VOLTAGE RANGE COMMON MODE VOLTAGE RANGE COMMON MODE REJECTION, DC NOISE

TEST CONDITIONS1Full temperature range

MIN

TYP1 20

MAX5 50 20 100 0.1 50

PAD20-18

UNITSmV V/OC V/V pA pA/V pA G pF V V dB V RMS dB MHz degree V V A V/S S V mA

100 4 +Vs15 Vs+8 98 100kHz bandwidth, 1k RS RL= 10k, CC=68 pF CC=68pF Full temperature range IO = 5A IO = 5A CC = 68pF 2V Step, CC = 68pF No load, DC 108 1 60 +Vs7 Vs+7 +Vs6 Vs+6 5 5 4 8 108 10


GAINOPEN LOOP GAIN BANDWIDTH PRODUCT @ 1MHz PHASE MARGIN

OUTPUTVOLTAGE SWING VOLTAGE SWING CURRENT, continuous, DC SLEW RATE, AV = +50 SETTLING TIME, to 0.1% RESISTANCE

POWER SUPPLYVOLTAGE CURRENT, quiescent

15

60 10

75 122.1 to air 3.1 to air 105 70 1.7 to case 2.5 to case 105 NA

THERMALRESISTANCE, AC, junction to air or case RESISTANCE, DC junction to air or case TEMPERATURE RANGE, substrate 5 TEMPERATURE RANGE, ambient6

Full temperature range, f 60Hz Full temperature range 40 40

C/W C/W O C O CO

O

FAN, 40mm dc brushless, ball bearingOPERATING VOLTAGE 12 NA V OPERATING CURRENT 50 NA mA AIR FLOW 7.5 NA CFM RPM 7000 NA RPM NOISE 30 NA dB 7 45 kHrs NA L10, life expectancy, 50OC 7 60 kHrs NA L10, life expectancy, 25OC NOTES: 1. Unless otherwise noted: TC = 25OC, compensation Cc = 100pF, DC input specifications are value given, power supply voltage is typical rating. 2. Derate internal power dissipation to achieve high MTBF. 3. Doubles for every 10OC of case temperature increase. 4. +Vs and Vs denote the positive and negative supply voltages. 5. Limited by fan characteristics. During operation, even though the heat sink may be at 85OC the fan will be at a lower temperature. 6. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz. 7. L10 refers to the time it takes for 10% of a population of fans to fail. Lower ambient temperature increases fan life. 8. Specifications for the PAD20-1 are the same as for the PAD20 except as shown in this column.

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PAD20 OPERATING CONSIDERATIONSforth a few times to bed the amplifier into the heat sink grease. On the final twist align the mounting holes of the amplifier with the mounting holes in the heat sink and finish the mounting using 4-40 hex male-female spacers and torque to 4.7 in lb [53 N cm] max. Mount the amplifier to the mother board with 4-40 X 1/4 screws. See Dimensional Information for additional recommendations.

COOLING FANThe PAD20 relies on its fan for proper cooling of the amplifier. Make sure that air flow to the fan and away from the heat sink remains unobstructed. To eliminate electrical noise created by the cooling fan we recommend a 47F capacitor placed directly at the point where the fan wires connect to the PCB. See application note AN-24 for further details.

PowerAmp Design

CURRENT LIMITThe current limiting function of the PAD20 is a versatile circuit that can be used to implement a four-wire current limit configuration or, in combination with some external components can be configured to implement a fold-over current limit circuit. The four-wire current limit configuration insures that parasitic resistance in the output line, Rp, does not affect the programmed current limit setting. See Figure 1. The sense voltage for current limit is 0.63V. Thus approximately: 0.63V IL = RS Where IL is the value of the limited current and RS is the value of the current limit sense resistor from 0.4-40. See graph for Current Limit Value vs RS. In addition, the sense voltage has a temperature coefficient approximately equal to 2.2mV/oC. The fold-over function reduces the available current as the voltage across the output transistors increases to help insure that the SOA of the output transistors is not exceeded. Refer to Figure 4 in Application Circuits for details on how to connect the current limit circuitry to implement either a four-wire current limit or current limit with a fold-over function. In some applications better current limiting protection and a lower sense voltage may be desired. In this case the PAD20 can be operated with the PAD125 current limit accessory module. See Figure 3 in the applications section and the PAD125 datasheet for more details.

TEMPERATURE REPORTINGAn analog output voltage is provided (pin 8, TMP) relative to ground and proportional to the temperature in degrees C. The slope is approximately -10.82mV/oC. The output voltage follows the equation: T = (2.127 V) (92.42) Where V is the TMP output voltage and T is the substrate temperature in degrees C.


THERMAL SHUTDOWNThe temperature monitoring circuit automatically turns off the amplifier when the substrate temperature reaches 110oC. When the substrate cools down 10oC the amplifier is enabled once again. The thermal shutdown feature is activated either by amplifier overloads or a failure of the fan circuit.

EXTERNAL SHUTDOWNWhen pin 9 ( SD ) is taken low (ground) the amplifier is turned off and remains off as long as pin 9 is low. When pin 9 is monitored with a high impedance circuit it also functions as a flag, reporting when the amplifier is shut down. A high (+5V) on pin 9 indicates the temperature is in the normal range. A low (ground) indicates a shutdown condition. See Application Circuits Figure 2.

PHASE COMPENSATIONThe PAD20 must be phase compensated. The compensation capacitor, CC, is connected between pins 2 and 3. The compensation capacitor must be an NPO type capacitor rated for the full supply voltage (150V). On page 2, under Amplifier Pinout and Connections, you will find a table that gives recommended compensation capacitance value for various circuit gains and the resulting slew rate for each capacitor value. Consult also the small signal response and phase response plots for the selected compensation value in the Typical Performance Graphs section. A compensation capacitor less than 47pF is not recommended.

MOUNTING THE PAD20The amplifier is supplied with four 4-40 M/F hex spacers at the four corners of the amplifier. Once the amplifier is seated, secure the module with the provided 4-40 nuts and torque to 4.7 in lb [53 N cm] max. See Dimensional Information for a detailed drawing. It is recommended that the heat sink be grounded to the system ground. This can easily be done by providing a grounded circuit board pad around any of the holes for the mounting studs.

MOUNTING THE PAD20-1 AMPLIFIERIn most applications the amplifier must be attached to a heat sink. Spread a thin and even coat of heat sink grease across the back of the PAD20-1 and also the heat sink where the amplifier is to be mounted. Push the amplifier into the heat sink grease on the heat sink while slightly twisting the amplifier back andPower Amp Design 3381 W Vision Dr Tucson AZ 85742 USA Phone (520)579-3441 Fax (208)279-5458 Web Site: www.PowerAmpDesign.net

4


PAD20TYPICAL PERFORMANCE GRAPHS

POWER DERATING

QUIESCENT CURRENT VS SUPPLY VOLTAGE NORMALIZED QUIESCENT CURRENT, IQ (%) 110

50 TOTAL POWER DISSIPATION, PD (W)

D2 PA

40PA D2 0

105

1 0-

PowerAmp Design

30

100

20USE CASE TEMP FOR PAD20-1 USE AMBIENT TEMP FOR PAD20

95

10

90

0 -40 -20 0 20 40 60 80 100 CASE OR AMBIENT AIR TEMPERATURE, T (OC)

85 0 15 30 45 60 +/- SUPPLY VOLTAGE, (V) 75

OFFSET VOLTAGE DRIFT 1.8NORMALIZED QUIESCENT CURRENT, IQ(%)

QUIESCENT CURRENT VS TEMPERATURE 125


2.1

OFFSET VOLTAGE,Vos (mV)

1.5 1.2 0.9 0.6 0.3 0 -0.3 -0.6 -0.9 -40

120

115

110

105

100

95 -40 -20 0 20 40 60 80 CASE TEMPERATURE, OC 100 120

-20

0

20 40 60 CASE TEMP, OC

80

100

120

OUTPUT SWING FROM SUPPLY RAILS 6 OUTPUT SWING FROM +Vs OR -Vs, V3

HARMONIC DISTORTION

5.5

T

5

DISTORTION, %

U , -O OC 25 = C

TP

UT0.3

Av = -10 Cc = 68pF 16 LOAD Vs = 50V

0.035WW

4.5

TC=25OC, +OUTPUT

50

4 0 1 2 3 OUTPUT AMPS, A 4 5

0.003 0.003 30

100

1k 1000 FREQUENCY, F(Hz)

10k 10000

30k

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COMPACT HIGH VOLTAGE OP AMPSMALL SIGNAL RESPONSE 120-90c= C F 0p 47

PAD20TYPICAL PERFORMANCE GRAPHSSMALL SIGNAL PHASE RESPONSE

100 OPEN LOOP GAIN, A(dB)

80PHASE, (O)F 8p F =6 pF 7p Cc 70 =4 =4 Cc Cc pF 20 =2 Cc

-120

PowerAmp Design

220 Cc =

60

pF

4050 LOAD 200mA

-150CcCc F 7p =4

=6

8p

F

20

0 1 10 10 10k 100k1 1M 10000000 100 1000 10000100000 00000010M 1k 100 FREQUENCY, F(Hz)POWER RESPONSE 200 OUTPUT VOLTAGE SWING, V(p-p)

-180 10k 10000

100k 1M 100000 1000000 FREQUENCY, F(Hz)

10M 10000000

TEMPERATURE OUTPUT


2.6 2.4

100 90 80 70 60 50 40 30 20

TEMP OUTPUT, VOLTS (V)300k

2.2 2 1.8 1.6 1.4 1.2 1

F 0p =22 CC pF 70 =4 CC

F 7p =4 F CC 8p =6 CC

10 1000 1k

100k 10000 100000 10k FREQUENCY, F(Hz)CURRENT LIMIT VS RS

0.8 -40

-20 0 20 40 60 80 100 SUBSTRATE TEMPERATURE, OC

120

2 1 CURRENT LIMIT VALUE, I(A)

0.1

TC=-25OC

+IL TC=25OC TC=85OC

TC=-25OC 0.01 -IL TC=25OC TC=85OC .002 0.4

1 10 100 CURRENT LIMIT RESISTOR, RS()

400

1kHz sine clipped by current limit into 15 load

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PAD20PERFORMANCE GRAPHS CONTINUED

SHUTDOWN RESPONSE, NEGATIVE OUTPUT TO ZERO TRANSITION The oscilloscope display at the left shows a view of a 5kHz, 2.5A p-p amplifier output signal being interrupted near the negative peak by a shutdown signal on Ch1. The Ch2 display shows the output current going to zero about 6S after the shutdown signal goes low.

PowerAmp Design

SHUTDOWN RESPONSE, POSITIVE OUTPUT TO ZERO TRANSITION The oscilloscope display at the right shows a view of a 5kHz, 2.5A p-p amplifier output signal being interrupted near the positive peak by a shutdown signal on Ch1. The Ch2 display shows the output current going to zero about 40S after the shutdown signal goes low.


SHUTDOWN RECOVERY The oscilloscope display at the left shows a view of a 5kHz, 2.5A p-p amplifier output signal on Ch2 resuming normal operation in the negative output direction after a shutdown signal on Ch1 go high (not shutdown). The output signal resumes normal operation after a delay of about 40S .

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COMPACT HIGH VOLTAGE OP AMPSHUTDOWN RECOVERY

PAD20PERFORMANCE GRAPHS CONTINUED

The oscilloscope display at the left shows a view of a 5kHz, 2.5A p-p amplifier output signal on Ch2 resuming normal operation in the positive output direction after a shutdown signal on Ch1 go high (not shutdown). The output signal resumes normal operation after a delay of about 10S.


Ch2, Pulse Response, 5kHz, 10Vp-p G=-10, Cc=68pF, 50 Load

Ch2, Pulse Response, 5kHz, 90Vp-p G=-10, Cc=68pF, 50 Load

Ch2, Pulse Response, Overloaded Input, 5kHz, 100Vp-p G=-10, Cc=68pF, 50 Load

15kHz sine into 25 load, G=-10,CC=68pF

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PAD20SAFE OPERATING AREA

SAFE OPERATING AREA 10 OUTPUT CURRENT, Io (A)1mDC , 30 O C

10 10 0S

S

PowerAmp Design

S

10 0AM BI

m

S

10 m

S

EN T


1

] ]]

1S 10S 50S PULSE 3% DUTY CYCLE

0.2 6 200 10 100 SUPPLY TO OUTPUT DIFFERENTIAL,Vs-Vo (V)

SAFE OPERATING AREAThe safe operating area (SOA) of a power amplifier is its single most important specification. The SOA graph presented above serves as a first approximation to help you decide if the PAD20 will meet the demands of your application. But a more accurate determination can be reached by making use of the PAD Power spreadsheet which can be found in the Power Amp Design website under the Design Spreadsheet tab. While the graph above adequately shows DC SOA and some pulse information it does not take into account ambient temperatures higher than 30OC, AC sine, phase or non-symmetric conditions that often appear in real-world applications. The PAD Power spreadsheet takes all of these effects into account.

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PAD20DIMENSIONAL INFORMATION


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PAD20DIMENSIONAL INFORMATION CONTINUED


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PAD20APPLICATION CIRCUITS

RF

PowerAmp Design

RIN IN 14

12 IC

11 +IL

10 -IL OUT 5 RP RS RL

13


FIGURE 1. 4-WIRE CURRENT LIMITSD 9

5V 0 5.1k 2N2222

HIGH IMPEDANCE MEASURING CIRCUIT SHUTDOWN MONITOR LOW=SHUTDOWN HIGH=NORMAL OPERATION

TRANSISTOR CIRCUIT

5V 5V 0

SD 9 HIGH IMPEDANCE MEASURING CIRCUIT SHUTDOWN MONITOR LOW=SHUTDOWN HIGH=NORMAL OPERATION

OPEN COLLECTOR OR OPEN DRAIN LOGIC GATES CIRCUIT

FIGURE 2. EXTERNAL SHUTDOWN WITH MONITOR

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3 2 1 4 6 5 AC Cc1 Cc2 OUT +VS GND SUB

PAD20 VIEW FROM COMPONENT SIDERS -IN +IN IC +IL -IL SD TMP -VS 7 8 14 13 12 11 10 9

PowerAmp Design

TO FEEDBACK & LOAD

1 RESET

2 OUT

3 SD

4 STATUS

5 GND

6 -Vs

7 NC

8 +IL

9 -IL

10 IC

11 12 +Vs NC

PAD125 VIEW FROM COMPONENT SIDE


FIGURE 3 TYPICAL CONNECTIONS TO PAD125 CURRENT LIMIT ACCESSORY MODULE

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FIGURE 4 DUAL SLOPE (FOLD-OVER) CURRENT LIMIT

With the three current limit function pins (pins 10-12) dual slope current limiting can be implemented that more closely approximates the SOA curve of the amplifier than can be achieved with standard current limiting techniques. Values for resistors R1-R7 and RS can be calculated using the PAD Power Excel spreadsheet that can be downloaded from the Power Amp Design web site under the Design Spreadsheet tab.

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PowerAmp DesignPOWER OPERATIONAL AMPLIFIERKEY FEATURES

PAD38Rev B

HIGH VOLTAGE 200 VOLTS HIGH CURRENT 10 AMPS 125 WATT DISSIPATION CAPABILITY HIGH SLEW RATE- 10V/S FOUR WIRE CURRENT LIMIT

PowerAmp Design PAD38 POWER OPERATIONAL AMPLIFIER

APPLICATIONS

LINEAR AND ROTARY MOTOR DRIVE YOKE/MAGNETIC FIELD EXCITATION PROGRAMMABLE POWER SUPPLIES INDUSTRIAL (PA) AUDIO

DESCRIPTIONThe PAD38 is a power operational amplifier constructed with surface mount components to provide a cost effective solution for many industrial applications. With a footprint only 3.3in2 the PAD38 offers outstanding performance that rivals more expensive hybrid component amplifiers or rack-mount amplifiers. User selectable external compensation tailors the amplifiers response to the application requirements. Programmable current limit is builtin. The amplifier circuitry is built on a thermally conductive but electrically insulating substrate. No BeO is used in the PAD38. The resulting module is a small, high performance solution for many industrial applications.

Power Amp Design 3381 W Vision Dr Tucson AZ 85742 USA Phone (520)579-3441 Fax (208)279-5458 Web Site: www.PowerAmpDesign.net

POWER OPERATIONAL AMPLIFIER


EQUIVALENT CIRCUIT


PINOUT & CONNECTIONS

Cc 3 2 1 9 10 11 12 13 14 4 6 7 8 5 +VB GND NC Cc2 NC Cc1 NC NC NC NC NC +Vs C2 + C1

VIEW FROM COMPONENT SIDERS OUT 17 16 15

-ILIM NC NC -Vs -IN +IN GND NC -VB IQ +ILIM 30 29 28 27 26 25 24 23 22 21 20 19 18

TO FEEDBACK & LOAD

-Vs C4 PHASE COMPENSATION TYP. SLEW RATE GAIN Cc 1 470pF 4V/uS 3 220pF 9V/uS > 5 100pF 15V/uS > 12 47pF 20V/uS + C3

Power Amp Design

3381 W Vision Dr

Tucson AZ 85742

USA Phone (520)579-3441

Fax (208)279-5458


2

PAD38 POWER OPERATIONAL AMPLIFIERSUPPLY VOLTAGE, +Vs to Vs BOOST VOLTAGE, OUTPUT CURRENT, within SOA POWER DISSIPATION, internal, DC INPUT VOLTAGE, differential INPUT VOLTAGE, common mode 200V Vs 20V 25A 125W 20V VB


__________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSTEMPERATURE, pin solder, 10s TEMPERATURE, junction2 TEMPERATURE RANGE, storage OPERATING TEMPERATURE, case 200C 175C 40 to 105C 40 to 105C




MIN

TYP1 20

MAX3 50 20 100 0.1 50

UNITSmV V/OC V/V pA pA/V pA G pF V V dB V RMS dB MHz degree V V

100 4 +VB15 VB+7 98 100kHz bandwidth, 1k RS RL= 10k, CC=100pF CC=100pF Full temperature range IO = 10A IO = 10A +VB=+Vs+10V, IO = 10A -VB=-Vs-10V, IO = -10A CC = 100pF 2V Step, CC = 100pF No load, DC 108 45 Vs8 Vs+7 +Vs2 -Vs2.8 10 2 60 +Vs6.6 Vs+6 +Vs1.2 +Vs+2.2 10 12 2.5 4 106 10


OUTPUTVOLTAGE SWING VOLTAGE SWING VOLTAGE SWING VOLTAGE SWING CURRENT, continuous, DC SLEW RATE, AV = 10 SETTLING TIME, to 0.1% RESISTANCE

11

A V/S S V mA mAO O

POWER SUPPLYVOLTAGE CURRENT, quiescent, boost supply CURRENT, total

15

75

100 22 260.9 1.2 105

THERMALRESISTANCE, AC, junction to air RESISTANCE, DC junction to air, outputs TEMPERATURE RANGE, heat sink5

Full temperature range, f 60Hz Full temperature range 40

C/W C/W O C

NOTES: 1. Unless otherwise noted: TC = 25OC, compensation Cc = 470pF, DC input specifications are value given, power supply voltage is typical rating. 2. Derate internal power dissipation to achieve high MTBF. 3. Doubles for every 10OC of case temperature increase. 4. +Vs and Vs denote the positive and negative supply voltages to the output stage. +VB and VB denote the positive and negative supply voltages to the input stages. 5. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz. 7. Power supply voltages +VB and VB must not be less than +Vs and Vs respectively. Total voltage +VB to VB 240V maximum. 8. The PAD38 is constructed with MOSFET transistors and ESD handling procedures must be observed.

Power Amp Design

3381 W Vision Dr

Tucson AZ 85742

USA Phone (520)579-3441

Fax (208)279-5458


3


PAD38 OPERATING CONSIDERATIONS PHASE COMPENSATIONThe PAD38 must be phase compensated. The compensation capacitor, CC, is connected between pins 4 and 6. The compensation capacitor must be an NPO type capacitor rated for the full supply voltage (200V). On page 2, under Amplifier Pinout and Connections, you will find a table that gives recommended compensation capacitance value for various circuit gains and the resulting slew rate for each capacitor value. Consult also the small signal response and phase response plots for the selected compensation value in the Typical Performance Graphs section. A compensation capacitor less than 100pF is not recommended.

SAFETY FIRSTThe operating voltages of the PAD38 are potentially deadly. When developing an application circuit it is wise to begin with power supply voltages as low as possible while checking for circuit functionality. Increase supply voltages slowly as confidence in the application circuit increases. Always use a hands off method whereby test equipment probes are attached only when power is off.

PowerAmp Design

CURRENT LIMITThe current limiting function of the PAD38 is a versatile circuit that can be used to implement a four-wire current limit configuration. The four-wire current limit configuration insures that parasitic resistance in the output line, Rp, does not affect the programmed current limit setting. See Figure 1 below. The sense voltage for current limit is 0.7V. Thus: 0.7V IL = RS Where IL is the value of the limited current and RS is the value of the current limit sense resistor. In addition, the sense voltage has a temperature coefficient approximately equal to 2.2mV/oC.RF

USING THE IQ PIN FUNCTIONWhen pin 25 (IQ) is tied to pin 6 (Cc1) the class AB bias of the output stage becomes C bias. The quiescent current of the PAD38 typically drops by 10mA. In some applications the reduced quiescent current is important. However, note that applying this option will raise the output impedance of the amplifier which may change the stability of the circuit and will increase crossover distortion also.

PAD38 POWER OPERATIONAL AMPLIFIER

BOOST OPERATIONThe small signal stages of the PAD38 are connected to the VB power supply pins. When the VB voltages are greater than the Vs power supply pins the small signal stages of the amplifier are biased so that the output transistors can be driven very close to the Vs rails. Close swings to the supply rails increase the efficiency of the amplifier and make better use the supply voltages. This technique is often used to operate the amplifier with only a single high current power supply, thus reducing the system size and cost. Also see the application article AN-22 Single Supply Operation with Power Op Amps for more detailed information and circuits.

RIN IN 30 24 23 +ILIM -ILIM PAD38 OUT RP 15-17 RS RL

29

Figure 1 MOUNTING THE AMPLIFIERIn most applications the amplifier must be attached to a heat sink. Spread a thin and even coat of heat sink grease across the back of the PAD38 and also the heat sink where the amplifier is to be mounted. Push the amplifier into the heat sink grease on the heat sink while slightly twisting the amplifier back and forth a few times to bed the amplifier into the heat sink grease. On the final twist align the mounting holes of the amplifier with the mounting holes in the heat sink and finish the mounting using 4-40 hex male-female spacers. Mount the amplifier to the mother board with 4-40 X 1/4 screws.Power Amp Design 3381 W Vision Dr Tucson AZ 85742 USA Phone (520)579-3441 Fax (208)279-5458 Web Site: www.PowerAmpDesign.net

4



POWER DERATING 140 120 100 80 60 40 20 0 -40 -20 0 20 40 60 80 100 CASE TEMPERATURE, TC (OC) 120NORMALIZED QUIESCENT CURRENT, IQ (%) 120 110 100

QUIESCENT CURRENT VS SUPPLY VOLTAGE

TOTAL POWER DISSIPATION, PD (W)

PowerAmp Design

90 80 70 60 50 0 40 80 120 160 TOTAL SUPPLY VOLTAGE, (V) 200


OFFSET VOLTAGE DRIFT 1.8

QUIESCENT CURRENT VS TEMPERATURE NORMALIZED QUIESCENT CURRENT, IQ(%) 120

2.1


1.5 1.2 0.9 0.6 0.3 0 -0.3 -0.6 -0.9 -40

110

100


-20

0


80

100

120

OUTPUT SWING FROM SUPPLY RAILS 6 OUTPUT SWING FROM +Vs OR -Vs, V+VB=+VS +OUTPUT,PUT -OUT S -VB=-V

HARMONIC DISTORTION 1 1 Av = -10 Cc = 100pF 8 LOAD Vs = 38V5W

5

DISTORTION, %

4

0.1

3TJ=25OC-10V B=-VS UT, -V -OUTP+VB=+V +OUTPUT, S+10V

2

0.01

1

0 0 2

4 6 OUTPUT AMPS, A

8

10

0.001 0.001 30

50 W

100


10k 10000

30k

Power Amp Design

3381 W Vision Dr

Tucson AZ 85742

USA Phone (520)579-3441

Fax (208)279-5458


5

POWER OPERATIONAL AMPLIFIERSMALL SIGNAL RESPONSE 120 100 OPEN LOOP GAIN, A(dB)c= C

PAD38TYPICAL PERFORMANCE GRAPHSSMALL SIGNAL PHASE RESPONSE -90 -100 -110 -120Cc =4 7 0p

80 60

F

C c= 22 0p F C c= 47 pF

PHASE, (O)

F 0p 10 F 0p 47 c= C

PowerAmp Design

-130 -140 -150 -160

C c= C

22

c=

0p F 0p F

40 20 0 -20 1 10 10 8 LOAD IO=500mA DC

Cc =4

10

7p F

-170 -180 30k

1k 10k 100k 1000000 100 1000 10000 100000 1M 3M FREQUENCY, F(Hz)POWER RESPONSE

1M 100k 100000 1000000 FREQUENCY, F(Hz)

3M


200 OUTPUT VOLTAGE SWING, V(p-p)

100 90 80 70 60 50 40 30 20

F 47p C C= pF 100 C C= pF 220 C C=

pF 470 C C=

10 1000 1k

100k 10000 100000 10k FREQUENCY, F(Hz)

1000000 1M

10kHz square into 8 load, G= 10,CC=100pF, Vs=50V


30kHz sine into 8 load, G= 10,CC=100pF, Vs=50V

Power Amp Design

3381 W Vision Dr

Tucson AZ 85742

USA Phone (520)579-3441

Fax (208)279-5458


6



30 OUTPUT CURRENT, Io (A)

SAFE OPERATING AREA1m S

PowerAmp Design

1025 O C85 O C 12 5O C

10 m S

1


PULSE 3% DUTY CYCLE


SAFE OPERATING AREA

Power Amp Design

3381 W Vision Dr

Tucson AZ 85742

USA Phone (520)579-3441

Fax (208)279-5458


7



1

14


30

15


8

PowerAmp DesignPOWER OPERATIONAL AMPLIFIERKEY FEATURES

PAD39Rev B

HIGH VOLTAGE 100 VOLTS HIGH CURRENT 10 AMPS 125 WATT DISSIPATION CAPABILITY HIGH SLEW RATE- 10V/S FOUR WIRE CURRENT LIMIT OPTIONAL BOOST VOLTAGE INPUTS


APPLICATIONS

LINEAR AND ROTARY MOTOR DRIVE YOKE/MAGNETIC FIELD EXCITATION PROGRAMMABLE POWER SUPPLIES INDUSTRIAL (PA) AUDIO

DESCRIPTIONThe PAD39 is a power operational amplifier constructed with surface mount components to provide a cost effective solution for many industrial applications With a footprint only 3.3in2 the PAD39 offers outstanding performance that rivals more expensive hybrid component amplifiers or rack-mount amplifiers. User selectable external compensation tailors the amplifiers response to the application requirements. Programmable current limit is builtin. The amplifier circuitry is built on a thermally conductive but electrically insulating substrate. No BeO is used in the PAD39. The resulting module is a small, high performance solution for many industrial applications.




EQUIVALENT CIRCUIT



Cc 3 2 1 9 10 11 12 13 14 4 6 7 8 5 +VB GND NC Cc2 NC Cc1 NC NC NC NC NC +Vs C2 + C1

VIEW FROM COMPONENT SIDERS OUT 17 16 15

-ILIM NC NC -Vs -IN +IN GND NC -VB IQ +ILIM 30 29 28 27 26 25 24 23 22 21 20 19 18

TO FEEDBACK & LOAD

-Vs C4 PHASE COMPENSATION TYP. SLEW RATE GAIN Cc 1 470pF 4V/uS 3 220pF 9V/uS > 5 100pF 15V/uS > 12 47pF 20V/uS + C3

Power Amp Design

3381 W Vision Dr

Tucson AZ 85742

USA Phone (520)579-3441

Fax (208)279-5458


2

PAD39 POWER OPERATIONAL AMPLIFIERSUPPLY VOLTAGE, +Vs to Vs BOOST VOLTAGE, OUTPUT CURRENT, within SOA POWER DISSIPATION, internal, DC INPUT VOLTAGE, differential INPUT VOLTAGE, common mode 100V Vs 20V 25A 125W 20V VB


__________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSTEMPERATURE, pin solder, 10s TEMPERATURE, junction2 TEMPERATURE RANGE, storage OPERATING TEMPERATURE, case 200C 175C 40 to 105C 40 to 105C




MIN

TYP1 20

MAX3 50 20 100 0.1 50

UNITSmV V/OC V/V pA pA/V pA G pF V V dB V RMS dB MHz degree V V

100 4 +VB15 VB+7 98 100kHz bandwidth, 1k RS RL= 10k, CC=100pF CC=100pF Full temperature range IO = 10A IO = 10A +VB=+Vs+10V, IO = 10A -VB=-Vs-10V, IO = -10A CC = 100pF 2V Step, CC = 100pF No load, DC 108 45 Vs8 Vs+7 +Vs2 -Vs2.8 10 2 60 +Vs6.6 Vs+6 +Vs1.2 +Vs+2.2 10 15 2.5 4 106 10


OUTPUTVOLTAGE SWING VOLTAGE SWING VOLTAGE SWING VOLTAGE SWING CURRENT, continuous, DC SLEW RATE, AV = 10 SETTLING TIME, to 0.1% RESISTANCE

11

A V/S S V mA mAO O

POWER SUPPLYVOLTAGE CURRENT, quiescent, boost supply CURRENT, total

15

40

50 22 260.9 1.2 105


Full temperature range, f 60Hz Full temperature range 40

C/W C/W O C

NOTES: 1. Unless otherwise noted: TC = 25OC, compensation Cc = 470pF, DC input specifications are value given, power supply voltage is typical rating. 2. Derate internal power dissipation to achieve high MTBF. 3. Doubles for every 10OC of case temperature increase. 4. +Vs and Vs denote the positive and negative supply voltages to the output stage. +VB and VB denote the positive and negative supply voltages to the input stages. 5. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz. 7. Power supply voltages +VB and VB must not be less than +Vs and Vs respectively. Total voltage +VB to VB 120V maximum. 8. The PAD39 is constructed with MOSFET transistors and ESD handling procedures must be observed.

Power Amp Design

3381 W Vision Dr

Tucson AZ 85742

USA Phone (520)579-3441

Fax (208)279-5458


3

POWER OPERATIONAL AMPLIFIER SAFETY FIRSTThe operating voltages of the PAD39 are potentially deadly. When developing an application circuit it is wise to begin with power supply voltages as low as possible while checking for circuit functionality. Increase supply voltages slowly as confidence in the application circuit increases. Always use a hands off method whereby test equipment probes are attached only when power is off.

PAD39 OPERATING CONSIDERATIONS PHASE COMPENSATIONThe PAD39 must be phase compensated. The compensation capacitor, CC, is connected between pins 4 and 6. The compensation capacitor must be an NPO type capacitor rated for the full supply voltage (100V). On page 2, under Amplifier Pinout and Connections, you will find a table that gives recommended compensation capacitance value for various circuit gains and the resulting slew rate for each capacitor value. Consult also the small signal response and phase response plots for the selected compensation value in the Typical Performance Graphs section. A compensation capacitor less than 100pF is not recommended.

PowerAmp Design

CURRENT LIMITThe current limiting function of the PAD39 is a versatile circuit that can be used to implement a four-wire current limit configuration. The four-wire current limit configuration insures that parasitic resistance in the output line, Rp, does not affect the programmed current limit setting. See Figure 1 below. The sense voltage for current limit is 0.7V. Thus: 0.7V IL = RS Where IL is the value of the limited current and RS is the value of the current limit sense resistor. In addition, the sense voltage has a temperature coefficient approximately equal to 2.2mV/oC.

USING THE IQ PIN FUNCTIONWhen pin 25 (IQ) is tied to pin 6 (Cc1) the class AB bias of the output stage becomes C bias. The quiescent current of the PAD39 typically drops by 10mA. In some applications the reduced quiescent current is important. However, note that applying this option will raise the output impedance of the amplifier which may change the stability of the circuit and will also increase crossover distortion.


BOOST OPERATIONThe small signal stages of the PAD39 are connected to the VB power supply pins. When the VB voltages are greater than the Vs power supply pins the small signal stages of the amplifier are biased so that the output transistors can be driven very close to the Vs rails. Close swings to the supply rails increase the efficiency of the amplifier and make better use the supply voltages. This technique is often used to operate the amplifier with only a single high current power supply, thus reducing the system size and cost.

RF

RIN IN 30 24 23 +ILIM -ILIM OUT RP 15-17 RS RL

29

Figure 1 MOUNTING THE AMPLIFIERIn most applications the amplifier must be attached to a heat sink. Spread a thin and even coat of heat sink grease across the back of the PAD39 and also the heat sink where the amplifier is to be mounted. Push the amplifier into the heat sink grease on the heat sink while slightly twisting the amplifier back and forth a few times to bed the amplifier into the heat sink grease. On the final twist align the mounting holes of the amplifier with the mounting holes in the heat sink and finish the mounting using 4-40 hex male-female spacers. Mount the amplifier to the mother board with 4-40 X 1/4 screws.Power Amp Design 3381 W Vision Dr Tucson AZ 85742 USA Phone (520)579-3441 Fax (208)279-5458 Web Site: www.PowerAmpDesign.net

4



POWER DERATING 140 120 100 80 60 40 20 0 -40 -20 0 20 40 60 80 100 CASE TEMPERATURE, TC (OC) 120NORMALIZED QUIESCENT CURRENT, IQ (%) 110

QUIESCENT CURRENT VS SUPPLY VOLTAGE

TOTAL POWER DISSIPATION, PD (W)

105

PowerAmp Design

100

95

90

85

80 20 40 60 80 TOTAL SUPPLY VOLTAGE, (V) 100




2.1


1.5 1.2 0.9 0.6 0.3 0 -0.3 -0.6 -0.9 -40

110

100


-20

0


80

100

120

OUTPUT SWING FROM SUPPLY RAILS 6 OUTPUT SWING FROM +Vs OR -Vs, V+VB=+VS +OUTPUT,PUT -OUT S -VB=-V

HARMONIC DISTORTION 1 1 Av = -10 Cc = 100pF 8 LOAD Vs = 38V5W

5

DISTORTION, %

4

0.1

3TJ=25OC-10V B=-VS UT, -V -OUTP+VB=+V +OUTPUT, S+10V

2

0.01

1

0 0 2

4 6 OUTPUT AMPS, A

8

10

0.001 0.001 30

50 W

100


10k 10000

30k

Power Amp Design

3381 W Vision Dr

Tucson AZ 85742

USA Phone (520)579-3441

Fax (208)279-5458


5

POWER OPERATIONAL AMPLIFIERSMALL SIGNAL RESPONSE 120 100 OPEN LOOP GAIN, A(dB)c= C

PAD39TYPICAL PERFORMANCE GRAPHSSMALL SIGNAL PHASE RESPONSE -90 -100 -110 -120Cc =4 7 0p

80 60

F

C c= 22 0p F C c= 47 pF

PHASE, (O)

F 0p 10 F 0p 47 c= C

PowerAmp Design

-130 -140 -150 -160

C c= C

22

c=

0p F 0p F

40 20 0 -20 1 10 10 8 LOAD IO=500mA DC

Cc =4

10

7p F

-170 -180 30k

1k 10k 100k 1000000 100 1000 10000 100000 1M 3M FREQUENCY, F(Hz)POWER RESPONSE

1M 100k 100000 1000000 FREQUENCY, F(Hz)

3M


OUTPUT VOLTAGE SWING, V(p-p)

100 90 80 70 60 50 40F 470p C C=C C=4C C= pF 100 C C= pF 220

7pF

30

20

10 1000 1k

100k 10000 100000 10k FREQUENCY, F(Hz)

1000000 1M

10kHz square into 8 load, G= 10,CC=100pF, Vs=50V


30kHz sine into 8 load, G= 10,CC=100pF, Vs=50V

Power Amp Design

3381 W Vision Dr

Tucson AZ 85742

USA Phone (520)579-3441

Fax (208)279-5458


6



30 OUTPUT CURRENT, Io (A)

SAFE OPERATING AREA1m S

PowerAmp Design

10

10 m 25 O C85 O C

S

1

12 5O C


PULSE 3% DUTY CYCLE

0.1 1 10 100 SUPPLY TO OUTPUT DIFFERENTIAL,Vs-Vo (V)

SAFE OPERATING AREA

Power Amp Design

3381 W Vision Dr

Tucson AZ 85742

USA Phone (520)579-3441

Fax (208)279-5458


7



1

14


30

15


8

PowerAmp DesignHIGH VOLTAGE OPERATIONAL AMPLIFIERKEY FEATURES

PAD112Rev C

PowerAmp Design

LOW COST HIGH VOLTAGE 150 VOLTS HIGH OUTPUT CURRENT 5 AMPS 50 WATT DISSIPATION CAPABILITY 100 WATT OUTPUT CAPABILITY INTEGRATED HEAT SINK AND FAN COMPATIBLE WITH PAD123 MODULE

PAD112

APPLICATIONS LINEAR MOTOR DRIVE HIGH VOLTAGE INSTRUMENTATION SEMICONDUCTOR TESTING

DESCRIPTIONThe PAD112 high voltage operational amplifier is constructed with surface mount components to provide a cost effective solution for many industrial applications. With a footprint only 3.8 in2 the PAD112 offers outstanding performance that rivals more expensive hybrid component amplifiers or rack-mount amplifiers. User selectable external compensation tailors the amplifiers response to the application requirements. Four-wire programmable current limit is built-in but the PAD112 is also compatible with the precision PAD123 Current Limit Accessory Module. The PAD112 also features a substrate temperature reporting output and overtemp shutdown. The amplifier circuitry is built on a thermally conductive but electrically insulating substrate mounted to an integral heat sink and fan assembly. No BeO is used in the PAD112. The resulting module is a small, high performance turn-key solution for many industrial applications.

HIGH VOLTAGE OPERATIONAL AMPLIFIER


A NEW CONCEPTA critical task in any power amplifier application is cooling the amplifier. Until now component amplifier manufacturers often treated this task as an after-thought, left for the user to figure out. At Power Amp Design the best heat sink and fan is chosen at the start and becomes an integral part of the overall amplifier design. The result is the most compact and volumetric efficient design combination at the lowest cost. In addition, this integrated solution concept offers an achievable real-world power dissipation rating, not the ideal rating usually cited when the amplifier case is somehow kept at 25oC. The user no longer needs to specify, procure or assemble separate components.

Power Amp Design

3381 W Vision Dr

Tucson AZ 85742

USA Phone (520)579-3441

Fax (208)279-5458




EQUIVALENT CIRCUIT

PowerAmp Design PAD112 HIGH VOLTAGE OPERATIONAL AMPLIFIER


Cc * * * 3 2 1 6 4 9 10 5 8 7 AC NC +Vcc Cc2 Cc1 TMP SD OUT1 GND SUB +HV C1

VIEW FROM COMPONENT SIDERS -IN +IN NC -Vcc NC NC NC IC +IL -IL OUT2 -HV 22 21 20 19 18 17 16 15 14 13 12 11 * * *

TO FEEDBACK & LOAD

C2 PHASE COMPENSATION GAIN Cc 1 470pF > 10 100pF SLEW RATE 3.7V/uS 14V/uS * SEE APPLICATION CIRCUITS FOR OTHER CONNECTIONS AND FUNCTIONS.

Power Amp Design

3381 W Vision Dr

Tucson AZ 85742

USA Phone (520)579-3441

Fax (208)279-5458


2

PAD112 HIGH VOLTAGE OPERATIONAL AMPLIFIERSUPPLY VOLTAGE, +HV to HV SUPPLY VOLTAGE, +Vcc to Vcc SUPPLY VOLTAGE, +Vcc SUPPLY VOLTAGE, Vcc OUTPUT CURRENT, peak POWER DISSIPATION, internal, DC 150V 150V +HV+15V7 HV-15V7 10A, within SOA 50W


__________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSINPUT VOLTAGE +Vcc to Vcc 20V DIFFERENTIAL INPUT VOLTAGE TEMPERATURE, pin solder, 10s 300C TEMPERATURE, junction2 175C TEMPERATURE RANGE, storage 40 to 70C5 OPERATING TEMPERATURE, heat sink 40 to 105C




MIN

TYP1 20

MAX3 50 20 100 0.1 50

UNITSmV V/OC V/V pA pA/V pA G pF V V dB V RMS dB MHz degree V V A V/S S V mA mAO O

100 4 +Vcc15 Vcc+7 110 100kHz bandwidth, 1k RS RL= 10k, CC=100pF CC=100pF Full temperature range IO = 5A IO = 5A CC = 100pF 2V Step, CC = 100pF No load, DC 108 2 45 +HV7 HV+7 11 +HV6 HV+6 5 14 6 8 128 10


OUTPUTVOLTAGE SWING VOLTAGE SWING CURRENT, continuous, DC SLEW RATE, AV = 10 SETTLING TIME, to 0.1% RESISTANCE

POWER SUPPLYVOLTAGE CURRENT, quiescent CURRENT, shutdown, pin 7 low

15

50 18 1.2

75 22 1.72 2.7 105


Full temperature range, f 60Hz Full temperature range 40 12 50 7.5 7000 30 45 60

C/W C/W O C V mA CFM RPM dB kHrs kHrs

FAN, 40mm dc brushless, ball bearingOPERATING VOLTAGE OPERATING CURRENT AIR FLOW RPM NOISE 8 L10, life expectancy, 50OC O 8 L10, life expectancy, 25 C

NOTES: 1. Unless otherwise noted: TC = 25OC, compensation Cc = 470pF, DC input specifications are value given, power supply voltage is typical rating. 2. Derate internal power dissipation to achieve high MTBF. 3. Doubles for every 10OC of case temperature increase. 4. +HV and HV denote the positive and negative supply voltages to the output stage. +Vcc and Vcc denote the positive and negative supply voltages to the input stages. 5. Limited by fan characteristics. During operation, even though the heat sink may be at 85OC or more the fan will be at a lower temperature. 6. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz. 7. Power supply voltages +Vcc and Vcc must not be less than +HV and HV respectively. Total voltage +Vcc to Vcc 150V maximum. 8. L10 refers to the time it takes for 10% of a population of fans to fail. Lower ambient temperature increases fan life.

Power Amp Design

3381 W Vision Dr

Tucson AZ 85742

USA Phone (520)579-3441

Fax (208)279-5458


3


PAD112 OPERATING CONSIDERATIONS TEMPERATURE REPORTINGAn analog output voltage is provided (pin 6, TMP) relative to ground and proportional to the temperature in degrees C. The slope is approximately -10.82mV/oC. The output voltage follows the equation: T = (2.127 V) (92.42) Where V is the TMP output voltage and T is the substrate temperature in degrees C. This high impedance output circuit is susceptible to capacitive loading and pickup from the output of the amplifier. When monitoring TMP filter the voltage as shown in Figure 3. See Applications Circuits.

SAFETY FIRSTThe operating voltages of the PAD112 are potentially deadly. When developing an application circuit it is wise to begin with power supply voltages as low as possible while checking for circuit functionality. Increase supply voltages slowly as confidence in the application circuit increases. Always use a hands off method whereby test equipment probes are attached only when power is off.

PowerAmp Design


PAD112

THERMAL SHUTDOWN CURRENT LIMITThe current limiting function of the PAD112 is a versatile circuit that can be used to implement a four-wire current limit configuration or, in combination with some external components can be configured to implement a fold-over current limit circuit. The four-wire current limit configuration insures that parasitic resistance in the output line, Rp, does not affect the programmed current limit setting. See Figure 1. The sense voltage for current limit is 0.65V. Thus: 0.65V IL = RS Where IL is the value of the limited current and RS is the value of the current limit sense resistor. In addition, the sense voltage has a temperature coefficient approximately equal to 2.2mV/oC. The fold-over function reduces the available current as the voltage across the output transistors increases to help insure that the SOA of the output transistors is not exceeded. Refer to Application Circuits for details on how to connect the current limit circuitry to implement either a four-wire current limit or current limit with a fold-over function. The PAD112 is also compatible with the precision PAD125 Current Limit Accessory Module. See Figure 4 and the datasheet for the PAD125 for further details. The temperature monitoring circuit automatically turns off the amplifier when the substrate temperature reaches 110oC. When the substrate cools down 10oC the amplifier is enabled once again. The thermal shutdown feature is activated either by amplifier overloads or a failure of the fan circuit.


EXTERNAL SHUTDOWNWhen pin 7 ( SD ) is taken low (ground) the amplifier is turned off and remains off as long as pin 7 is low. When pin 7 is monitored with a high impedance circuit it also functions as a flag, reporting when the amplifier is shut down. A high (+5V) on pin 7 indicates the temperature is in the normal range. A low (ground) indicates a shutdown condition. See Application Circuits for details on how to implement an external shutdown circuit and how to monitor the shutdown status when temperature is in the normal range. A low (ground) indicates a shutdown condition. See Application Circuits for details on how to implement an external shutdown circuit and how to monitor the shutdown status.

PHASE COMPENSATIONThe PAD112 must be phase compensated. The compensation capacitor, CC, is connected between pins 4 and 5. The compensation capacitor must be an NPO type capacitor rated for the full supply voltage (150V). On page 2, under Amplifier Pinout and Connections, you will find a table that gives recommended compensation capacitance value for various circuit gains and the resulting slew rate for each capacitor value. Consult also the small signal response and phase response plots for the selected compensation value in the Typical Performance Graphs section. A compensation capacitor less than 100pF is not recommended.

MOUNTING THE AMPLIFIERThe amplifier is supplied with four 4-40 M/F hex spacers at the four corners of the amplifier. Once the amplifier is seated, secure the module with the provided 4-40 nuts and torque to 4.7 in lb [53 N cm] max. See Dimensional Information for a detailed drawing. It is recommended that the heat sink be grounded to the system ground. This can easily be done by providing a grounded circuit board pad around any of the holes for the mounting studs.

Power Amp Design

3381 W Vision Dr

Tucson AZ 85742

USA Phone (520)579-3441

Fax (208)279-5458


4

HIGH VOLTAGE OPERATIONAL AMPLIFIERPOWER DERATINGNORMALIZED QUIESCENT CURRENT, IQ (%)


QUIESCENT CURRENT VS SUPPLY VOLTAGE 115

50 TOTAL POWER DISSIPATION, PD (W)

PowerAmp Design

40

110

30

105

20

100

10

95

0 -40

90

-20 0 20 40 60 80 AMBIENT AIR TEMPERATURE, TA (OC)

100

0

40 80 120 TOTAL SUPPLY VOLTAGE, (V)

160

PAD112



2.1


1.5 1.2 0.9 0.6 0.3 0 -0.3 -0.6 -0.9 -40


140

120

100


-20

0


80

100

120

OUTPUT SWING FROM SUPPLY RAILS 6 OUTPUT SWING FROM +Vs OR -Vs, V1

HARMONIC DISTORTION

5.5

T

5

DISTORTION, %

OU ,OC 25 = C

U TP

T

Av = -10 Cc = 100pF 8 LOAD Vs = 45V

0.1 0.1

7.6W

4.5

TC=25OC, +OUTPUT76W

4 0 1 2 3 OUTPUT AMPS, A 4 5

0.01 0.01 30

100


10k 10000

30k

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HIGH VOLTAGE OPERATIONAL AMPLIFIERSMALL SIGNAL RESPONSE 120-90 SMALL SIGNAL PHASE RESPONSE


PowerAmp Design


-105Cc =4 70 pF

80PHASE, (O)

-120

60pF 00 =1 Cc pF 70 =4 Cc

-135

pF 00 =1 Cc

40

-150

20

-165

0 1 10 10 10k 100k1 1M 10000000 100 1000 10000100000 00000010M 1k 100 FREQUENCY, F(Hz)POWER RESPONSE 200 OUTPUT VOLTAGE SWING, V(p-p)

-180 30k

100k 1M 100000 1000000 2M FREQUENCY, F(Hz)

PAD112

TEMPERATURE OUTPUT 2.6 2.4 TEMP OUTPUT, VOLTS (V)

130 100 90 80 70 60 50 40 30

2.2 2 1.8 1.6 1.4 1.2 1


pF 100 C C=

pF 470 C C=

20 1000 1k

100k 10000 100000 10k FREQUENCY, F(Hz)

300k

0.8 -40


120


20kHz sine into 8 load, G=-10,CC=100pF

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PAD112

PERFORMANCE GRAPHS CONTINUED

SHUTDOWN RESPONSE, NEGATIVE OUTPUT TO ZERO TRANSITION The oscilloscope display at the left shows a view of a 10kHz 2A p-p amplifier output signal being interrupted near the negative peak by a shutdown signal on Ch1. The Ch2 display shows the output current going to zero about 20S after the shutdown signal goes low.

PowerAmp Design PAD112

SHUTDOWN RESPONSE, POSITIVE OUTPUT TO ZERO TRANSITION The oscilloscope display at the right shows a view of a 10kHz 2A p-p amplifier output signal being interrupted near the positive peak by a shutdown signal on Ch1. The Ch2 display shows the output current going to zero about 20S after the shutdown signal goes low.


Pulse Response, Negative to Positive, 250 Load G=-10, Cc=100pF

Pulse Response, Positive to Negative, 250 Load G=-10, Cc=100pF

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PAD112


SHUTDOWN RECOVERY TO POSITIVE OUTPUT TRANSITION The oscilloscope display at the left shows a view of a 10kHz, 2A p-p amplifier output signal on Ch2 recovering from a shutdown signal on Ch1 (high on Ch1 means not shutdown). The output recovers to its expected output near the positive peak after about 40S.


SHUTDOWN RECOVERY TO NEGATIVE OUTPUT TRANSITION The oscilloscope display at the left shows a view of a 10kHz, 2A p-p amplifier output signal on Ch2 recovering from a shutdown signal on Ch1(high on Ch1 means not shutdown). The output recovers to its expected output near the negative peak in less than 40S.


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SAFE OPERATING AREA 1010 0 S10 S

PowerAmp Design

OUTPUT CURRENT, Io (A)

1mDC ,3

S

10 00O C AM BI EN

m

S

10

m

S

PAD112

T

] ]]

1

1S 10S 50S PULSE 3% DUTY CYCLE



SAFE OPERATING AREAThe safe operating area (SOA) of a power amplifier is its single most important specification. The SOA graph presented above serves as a first approximation to help you decide if the PAD112 will meet the demands of your application. But a more accurate determination can be reached by making use of the PAD Power spreadsheet which can be found in the Power Amp Design website under Design Spreadsheet tab. While the graph above adequately shows DC SOA and some pulse information it does not take into account ambient temperatures higher than 30OC, AC sine, phase or non-symmetric conditions that often appear in real-world applications. The PAD Power spreadsheet takes all of these effects into account.

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9




PADXXX


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RF

PowerAmp Design

RIN IN 22

15 IC

14 13 +IL -IL OUT 9,12 RP RS RL

21

PAD112

FIGURE 1. 4-WIRE CURRENT LIMITSD 7


5V 0 5.1k 2N2222

HIGH IMPEDANCE MEASURING CIRCUIT SHUTDOWN MONITOR LOW=SHUTDOWN HIGH=NORMAL OPERATION

TRANSISTOR CIRCUIT

5V 5V 0

SD 7 HIGH IMPEDANCE MEASURING CIRCUIT SHUTDOWN MONITOR LOW=SHUTDOWN HIGH=NORMAL OPERATION

OPEN COLLECTOR OR OPEN DRAIN LOGIC GATES CIRCUIT

FIGURE 2. EXTERNAL SHUTDOWN WITH MONITOR

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PowerAmp Design

10k 2200pF

TMP MONITOR

6 7 8 TMP SD GND

MONITOR 2200pF

PAD112

FIGURE 3 MONITORING TMP AND SD OUTPUTS


3 2 1 4 6 9 10 5 8 7 AC NC +Vcc Cc2 Cc1 TMP SD OUT1 GND SUB +HV

C1

PAD112 VIEW FROM COMPONENT SIDERS -IN +IN NC -Vcc NC NC NC IC +IL -IL OUT2 -HV 22 21 20 19 18 17 16 15 14 13 12 11

TO FEEDBACK & LOAD

C2

1 RESET

2 OUT

3 SD

4 STATUS

5 GND

6 -Vs

7 NC

8 +IL

9 -IL

10 IC

11 12 +Vs NC

PAD125 VIEW FROM COMPONENT SIDE

FIGURE 4 TYPICAL PAD112 CONNECTIONS TO PAD125 ACCESSORY MODULE

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FIGURE 5 DUAL SLOPE (FOLD-OVER) CURRENT LIMIT

With the three current limit function pins (pins 13-15) dual slope current limiting can be implemented that more closely approximates the SOA curve of the amplifier than can be achieved with standard current limiting techniques. Values for resistors R1-R7 and RS can be calculated using the PAD Power spreadsheet that can be downloaded from the Power Amp Design web site. Fold-over current limit can also be achieved when using the PAD123 Current Limit Accessory Module. See the datasheet for the PAD123 for further details.

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PowerAmp DesignHIGH VOLTAGE OPERATIONAL AMPLIFIERKEY FEATURES

PAD113Rev H

PowerAmp Design

LOW COST HIGH VOLTAGE 500 VOLTS HIGH OUTPUT CURRENT 1.5A 29 WATT DISSIPATION CAPABILITY 97 WATT OUTPUT CAPABILITY INTEGRATED HEAT SINK AND FAN

APPLICATIONS PIEZO TRANSDUCER DRIVE HIGH VOLTAGE INSTRUMENTATION SEMICONDUCTOR TESTING

PAD113

DESCRIPTIONThe PAD113 high voltage operational amplifier is constructed with surface mount components to provide a cost effective solution for many industrial applications. With a footprint only 3.8 in2 the PAD113 offers outstanding performance that rivals much more expensive hybrid component amplifiers or rack-mount amplifiers. User selectable external compensation tailors the amplifiers response to the application requirements. Four-wire programmable current limit is built-in. The PAD113 also features a substrate temperature reporting output and overtemp shutdown. The amplifier circuitry is built on a thermally conductive but electrically insulating substrate mounted to an integral heat sink and fan assembly. No BeO is used in the PAD113. The resulting module is a small, high performance turn-key solution for many industrial applications.



A NEW CONCEPTA critical task in any power amplifier application is cooling the amplifier. Until now component amplifier manufacturers often treated this task as an after-thought, left for the user to figure out. At Power Amp Design the best heat sink and fan is chosen at the start and becomes an integral part of the overall amplifier design. The result is the most compact and volumetric efficient design combination at the lowest cost. In addition, this integrated solution concept offers an achievable real-world power dissipation rating, not the ideal rating usually cited when the amplifier case is somehow kept at 25oC. The user no longer needs to specify, procure or assemble separate components.Fax (208)279-5458 Web Site: www.PowerAmpDesign.net

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EQUIVALENT CIRCUIT



Cc * * * 3 2 1 4 6 9 10 5 8 7 AC NC +Vcc Cc2 Cc1 TMP SD OUT1 GND SUB +HV C1

VIEW FROM COMPONENT SIDERS -IN +IN NC -Vcc NC NC NC IC +IL -IL OUT2 -HV 22 21 20 19 18 17 16 15 14 13 12 11 * * *

TO FEEDBACK & LOAD

C2 PHASE COMPENSATION GAIN Cc 1 150pF > 15 33pF > 50 10pF SLEW RATE 3V/uS 25V/uS 40V/uS * SEE APPLICATION CIRCUITS FOR OTHER CONNECTIONS AND FUNCTIONS.

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PAD113 HIGH VOLTAGE OPERATIONAL AMPLIFIERSUPPLY VOLTAGE, +HV to HV SUPPLY VOLTAGE, +Vcc to Vcc SUPPLY VOLTAGE, +Vcc SUPPLY VOLTAGE, Vcc OUTPUT CURRENT, peak POWER DISSIPATION, internal, DC 500V 500V +HV+15V7 HV-15V7 1.5A, within SOA 29W Total


__________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSINPUT VOLTAGE +Vcc to Vcc 20V DIFFERENTIAL INPUT VOLTAGE TEMPERATURE, pin solder, 10s 300C TEMPERATURE, junction2 150C TEMPERATURE RANGE, storage 40 to 70C5 OPERATING TEMPERATURE, heat sink 40 to 105C




MIN

TYP1 20

MAX3 50 20 100 0.1 50

UNITSmV V/OC V/V pA pA/V pA G pF V V dB V RMS dB MHz degree V V A V/S S V mA mAO O

100 4 +Vcc15 Vcc+7 110 100kHz bandwidth, 1k RS RL= 10k, CC=2.7pF Full temperature range IO = 1A IO = 1A CC = 10pF 2V Step, Cc=10pF No load, DC 108 4 60 +HV8 HV+8 40 5 15 +HV6 HV+6 1.5 128 10


OUTPUTVOLTAGE SWING VOLTAGE SWING CURRENT, continuous, DC SLEW RATE, AV = 100 SETTLING TIME, to 0.1% RESISTANCE

POWER SUPPLYVOLTAGE CURRENT, quiescent CURRENT, shutdown, pin 7 low

40

225 10 1.2

250 11.5 1.72.6 4.3 105


Full temperature range, f 60Hz Full temperature range 40 12 150 5 8000 31 45 60

C/W C/W O C V mA CFM RPM dB kHrs kHrs

FAN, 40mm dc brushless, ball bearingOPERATING VOLTAGE OPERATING CURRENT AIR FLOW RPM NOISE 8 L10, life expectancy, 50OC O 8 L10, life expectancy, 25 C

NOTES: 1. Unless otherwise noted: TC=25OC, compensation Cc=220pF, DC input specifications are value given, power supply voltage is typical rating. 2. Derate internal power dissipation to achieve high MTBF. 3. Doubles for every 10OC of case temperature increase. 4. +HV and HV denote the positive and negative supply voltages to the output stage. +Vcc and Vcc denote the positive and negative supply voltages to the input stages. 5. Limited by fan characteristics. During operation, even though the heat sink may be at 85OC or more the fan will be at a lower temperature. 6. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz. 7. Power supply voltages +Vcc and Vcc must not be less than +HV and HV respectively. Total voltage +Vcc to Vcc 500V maximum. 8. L10 refers to the time it takes for 10% of a population of fans to fail. Lower ambient temperature increases fan life.

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PAD113 OPERATING CONSIDERATIONS

SAFETY FIRSTThe operating voltages of the PAD113 are potentially deadly. When developing an application circuit it is wise to begin with power supply voltages as low as possible while checking for circuit functionality. Increase supply voltages slowly as confidence in the application circuit increases. Always use a hands off method whereby test equipment probes are attached only when power is off. See application note AN-16 for PCB layout guidelines. 4.7 in lb [53 N cm] max. See Dimensional Information for a detailed drawing. It is recommended that the heat sink be grounded to the system ground. This can easily be done by providing a grounded circuit board pad around any of the holes for the mounting studs.

PowerAmp Design

TEMPERATURE REPORTINGAn analog output voltage is provided (pin 6, TMP) relative to ground and proportional to the temperature in degrees C. The slope is approximately -10.82mV/oC. The output voltage follows the equation: T = (2.127 V) (92.42) Where V is the TMP output voltage and T is the substrate temperature in degrees C. This high impedance output circuit is susceptible to capacitive loading and pickup from the output of the amplifier. When monitoring TMP filter the voltage as shown in Figure 3. See Applications Circuits.

EXTERNAL CIRCUIT COMPONENTSThe output of the PAD113 can swing up to +/- 240V and this may stress or destroy external components that are often not seriously considered when developing circuits with small signal op amps. High voltage rated resistors may be purchased for the feedback circuit or, alternately, several ordinary resistors may be placed in series to obtain the proper voltage rating. The compensation capacitor CC is a NPO type and is rated for 500V. See AN-16 for PCB layout guidelines.

PAD113


THERMAL SHUTDOWNThe temperature monitoring circuit automatically turns off the amplifier when the substrate temperature reaches 110oC. When the substrate cools down 10oC the amplifier is enabled once again. The thermal shutdown feature is activated either by amplifier overloads or a failure of the fan circuit.


CURRENT LIMITThe current limiting function of the PAD113 is a versatile circuit that can be used to implement a four-wire current limit configuration or, in combination with some external components can be configured to implement a fold-over current limit circuit. The four-wire current limit configuration insures that parasitic resistance in the output line, Rp, does not affect the programmed current limit setting. See Figure 1. The sense voltage for current limit is 0.63V. Thus approximately: 0.63V IL = RS Where IL is the value of the limited current and RS is the value of the current limit sense resistor from 0.4-40. See graph for Current Limit Value vs RS. In addition, the sense voltage has a temperature coefficient approximately equal to 2.2mV/oC. The fold-over function reduces the available current as the voltage across the output transistors increases to help insure that the SOA of the output transistors is not exceeded. Refer to Application Circuits for details on how to connect the current limit circuitry to implement either a four-wire current limit or current limit with a fold-over function. The PAD113 is also compatible with the precision PAD125 Current Limit Accessory Module. See Figure 4 and the datasheet for the PAD125 for further details.

EXTERNAL SHUTDOWNWhen pin 7 ( SD ) is taken low (ground) the amplifier is turned off and remains off as long as pin 7 is low. When pin 7 is monitored with a high impedance circuit it also functions as a flag, reporting when the amplifier is shut down. A high (+5V) on pin 7 indicates the temperature is in the normal range. A low (ground) indicates a shutdown condition. See Application Circuits for details on how to implement an external shutdown circuit and how to monitor the shutdown status when temperature is in the normal range. A low (ground) indicates a shutdown condition. See Application Circuits for details on how to implement an external shutdown circuit and how to monitor the shutdown status.

PHASE COMPENSATIONThe PAD113 must be phase compensated. The compensation capacitor, CC, is connected between pins 4 and 5. The compensation capacitor must be an NPO type capacitor rated for the full supply voltage (500V). On page 2, under Amplifier Pinout and Connections, you will find a table that gives recommended compensation capacitance value for various circuit gains and the resulting slew rate for each capacitor value. Consult also the small signal response and phase response plots for the selected compensation value in the Typical Performance Graphs section. A compensation capacitor less than 10pF is not recommended.Fax (208)279-5458 Web Site: www.PowerAmpDesign.net

MOUNTING THE AMPLIFIERThe amplifier is supplied with four 4-40 M/F hex spacers at the four corners of the amplifier. Once the amplifier is seated, secure the module with the provided 4-40 nuts and torque toPower Amp Design 3381 W Vision Dr Tucson AZ 85742

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HIGH VOLTAGE OPERATIONAL AMPLIFIERQUIESCENT CURRENT VS SUPPLY VOLTAGE NORMALIZED QUIESCENT CURRENT, IQ (%) 102


POWER DERATING 30 TOTAL POWER DISSIPATION, PD (W)

PowerAmp Design

100

20

98

96

10

94

0 -40

92-20 0 20 40 60 80 AMBIENT AIR TEMPERATURE, TA (OC) 100

0

100 200 300 400 TOTAL SUPPLY VOLTAGE, (V)

500

PAD113



2.1


1.5 1.2 0.9 0.6 0.3 0 -0.3 -0.6 -0.9 -40


106

104

102

-20

0


80

100

120

100 -40

-20

0 20 40 60 80 CASE TEMPERATURE, OC

100

120

OUTPUT SWING FROM SUPPLY RAILS 11 OUTPUT SWING FROM +Vs OR -Vs, V 10 9 8 7 6 5TPUT O , +OU T C=25 CUT PU T

HARMONIC DISTORTION 1 1 Av = -50 Cc = 10pF 32 LOAD Vs = 60V DISTORTION, %3.6W

T= C 2 5 OC , -O

36W4 0 0.25 0.5 0.75 1 OUTPUT AMPS, A 1.25 1.5

0.1 0.1 30

100


10k 10000

30k

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HIGH VOLTAGE OPERATIONAL AMPLIFIERSMALL SIGNAL RESPONSE 120-90Cc= 150 pF

PAD113TYPICAL PERFORMANCE GRAPHSSMALL SIGNAL PHASE RESPONSE

PowerAmp Design


-120

Cc =

80PHASE, (O) -150F 0p =1 Cc

33 pF

60

pF =10 Cc

-180

F 3p =3 pF Cc 50 =1 Cc

40

20

-210

0 1 10 10 10k 100k1 1M 10000000 100 1000 10000100000 00000010M 1k 100 FREQUENCY, F(Hz)POWER RESPONSE 500 400 OUTPUT VOLTAGE SWING, V(p-p) 300

-240 50k 100000 100k

1M 1000000 FREQUENCY, F(Hz)

10M 10000000

PAD113

TEMPERATURE OUTPUT 2.6 2.4 TEMP OUTPUT, VOLTS (V) 2.2 2 1.8 1.6 1.4 1.2 1 0.8 -40


200pF 150 C C=

F 10p C C=

F 33p C C=

100 90 80 70 60 50 1000 1k 100k 10000 100000 10k FREQUENCY, F(Hz)CURRENT LIMIT VS RS

300k


120

2 1 CURRENT LIMIT VALUE, I(A)

0.1

TC=-25OC

+IL TC=25OC TC=85OC

TC=-25OC 0.01 -IL TC=25OC TC=85OC .002 0.4

1 10 100 CURRENT LIMIT RESISTOR, RS()

400


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PAD113


SHUTDOWN RESPONSE, NEGATIVE OUTPUT TO ZERO TRANSITION The oscilloscope display at the left shows a view of a 5kHz, 1A p-p amplifier output signal being interrupted near the negative peak by a shutdown signal on Ch1. The Ch2 display shows the output current going to zero about 150S after the shutdown signal goes low.


SHUTDOWN RESPONSE, POSITIVE OUTPUT TO ZERO TRANSITION The oscilloscope display at the right shows a view of a 5kHz, 1A p-p amplifier output signal being interrupted

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