TL 783C,Y High Voltage Adjustable Regulator

7/23/2019 TL 783C,Y High Voltage Adjustable Regulator

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TL783C, TL783YHIGH-VOLTAGE ADJUSTABLE REGULATOR

SLVS036C SEPTEMBER 1981 REVISED APRIL 1997

1POST OFFICE BOX 655303 DALLAS, TEXAS 75265

Output Adjustable From 1.25 V to 125 VWhen Used With an External Resistor

Divider

700-mA Output Current

Full Short-Circuit, Safe-Operating-Area, andThermal Shutdown Protection

0.001%/V Typical Input Voltage Regulation

0.15% Typical Output Voltage Regulation

76-dB Typical Ripple Rejection

Standard TO-220AB Package

description

The TL783C is an adjustable three-terminal high-voltage regulator with an output range of 1.25 V to125 V and a DMOS output transistor capable of

sourcing more than 700 mA. It is designed for usein high-voltage applications where standardbipolar regulators cannot be used. Excellent performance specifications, superior to those of most bipolarregulators, are achieved through circuit design and advanced layout techniques.

As a state-of-the-art regulator, the TL783C combines standard bipolar circuitry with high-voltage

double-diffused MOS transistors on one chip to yield a device capable of withstanding voltages far higher thanstandard bipolar integrated circuits. Because of its lack of secondary breakdown and thermal runawaycharacteristics usually associated with bipolar outputs, the TL783C maintains full overload protection whileoperating at up to 125 V from input to output. Other features of the device include current limiting,safe-operating-area (SOA) protection, and thermal shutdown. Even if ADJ is inadvertently disconnected, theprotection circuitry remains functional.

Only two external resistors are required to program the output voltage. An input bypass capacitor is necessaryonly when the regulator is situated far from the input filter. An output capacitor, although not required, improves

transient response and protection from instantaneous output short circuits. Excellent ripple rejection can beachieved without a bypass capacitor at the adjustment terminal.

AVAILABLE OPTIONS

PACKAGED DEVICE

TJHEAT-SINK MOUNTED

(3-PIN)

(KC)

FORM

(Y)

0C to 125C TL783CKC TL783Y

TO-220AB

The output terminal is in electricalcontact with the mounting base.

IN

OUT

ADJ

IO

A

KC PACKAGE

(TOP VIEW)

PRODUCTION DATA information is current as of publication date.Products conform to specifications per the terms of Texas Instrumentsstandard warranty. Production processing does not necessarily includetesting of all parameters.

Copyright1997, Texas Instruments Incorporated


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TL783C, TL783YHIGH-VOLTAGE ADJUSTABLE REGULATORSLVS036C SEPTEMBER 1981 REVISED APRIL 1997

2 POST OFFICE BOX 655303 DALLAS, TEXAS 75265

TL783Y chip information

This chip, when properly assembled, displays characteristics similar to those of the TL783C. Thermalcompression or ultrasonic bonding may be used on the doped aluminum bonding pads. The chip may bemounted with conductive epoxy or a gold-silicon preform.

BONDING PAD ASSIGNMENTS

CHIP THICKNESS: 15 MILS TYPICAL

BONDING PADS: 4 4 MILS MINIMUM

TJmax = 150C

TOLERANCES ARE 10%

ALL DIMENSIONS ARE IN MILS

OUTPUT TERMINAL MUST BEBONDED TO BOTH 2 AND 4

102

74

(2)(1)

(3)

ADJ

OUT(2), (4)

(1)

(3)TL783YIN

(4)


3/15




functional block diagram

+

ProtectionCircuit

OUT

IN

VrefR1

R2

VO

VI

Error

Amplifier

ADJ

VO V

ref 1 R2

R1

absolute maximum ratings over operating temperature range (unless otherwise noted)

Input-to-output differential voltage, Vl VO 125 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Continuous total power dissipation at (or below) TA= 25C (see Note 1) 2 W. . . . . . . . . . . . . . . . . . . . . . . . . .Continuous total power dissipation at (or below) TC= 70C (see Note 1) 20 W. . . . . . . . . . . . . . . . . . . . . . . . .Operating free-air, TA, case, TC, or virtual junction, TJ, temperature range 0C to 150C. . . . . . . . . . . . . . . . .Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 260C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings only, and

functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not

implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTE 1: For operation above TA= 25C or TC= 70C, refer to Figures 1 and 2, respectively. To avoid exceeding the design maximum virtual

junction temperature, these ratings should not be exceeded. Due to variations in individual device electrical characteristics and thermal

resistance, the built-in thermal overload protection may be activated at power levels slightly above or below the rated dissipation

Figure 1

TA Free-Air Temperature C

FREE-AIR TEMPERATURE

DISSIPATION DERATING CURVE

1000

800

400

200

0

1800

600

25 50 75 100

1400

1200

1600

2000

125 150

Derating Factor = 16 mW/C

RJA 62.5C/W

MaximumC

ontinuousPowerDissipationmW

Figure 2

TC Case Temperature C

16

12

4

025 50 75 100

20

CASE TEMPERATURE

DISSIPATION DERATING CURVE

125 150

8

24

Derating Factor = 250 mW/C

Above 70C

RJC4C/WMaximum

ContinuousPowerDissipationW


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recommended operating conditions

MIN MAX UNIT

Input-to-output voltage differential, VI VO 125 V

Output current, IO 15 700 mA

Operating virtual junction temperature, TJ 0 125 C

electrical characteristics at Vl VO= 25 V, IO= 0.5 A, TJ= 0Cto 125C (unless otherwise noted)

TL783CTEST CONDITIONS

MIN TYP MAX

TJ= 25C 0.001 0.01

Input voltage regulation I O= o , ra e ss pa onTJ= 0C to 125C 0.004 0.02

Ripple rejection VI(PP)= 10 V, VO= 10 V, f = 120 Hz 66 76 dB

VO 5 V 7.5 25 mV

O= m o m , J=VO 5 V 0.15% 0.5%

u pu vo age regu a onVO 5 V 20 70 mV

O= m o m , ra e ss pa onVO 5 V 0.3% 1.5%

Output voltage change withtemperature

0.4%

Output voltage long-term

drift1000 hours at TJ= 125C, VI VO= 125 V, See Note 2 0.2%

Output noise voltage f = 10 Hz to 10 kHz, TJ= 25C 0.003%

Minimum output current to

maintain regulationVI VO= 125 V 15 mA

VI VO= 25 V, t = 1 ms 1100

VI VO= 15 V, t = 30 ms 715ea ou pu curren

VI VO= 25 V, t = 30 ms 700 900m

VI VO= 125 V, t = 30 ms 100 250

Input current at ADJ 83 110 A

Change in input current at

ADJVI VO= 15 V to 125 V, IO= 15 mA to 700 mA, P rated dissipation 0.5 5 A

Reference voltage

(OUT to ADJ)

VI VO= 10 V to 125 V,

See Note 3

IO= 15 mA to 700 mA, P rated dissipation, 1.2 1.27 1.3 V

Pulse-testing techniques maintain the junction temperature as close to the ambient temperature as possible. Thermal effects must be taken into

account separately. Input voltage regulation is expressed here as the percentage change in output voltage per 1-V change at the input.

NOTES: 2. Since long-term drift cannot be measured on the individual devices prior to shipment, this specification is not intended to be a

guarantee or warranty. It is an engineering estimate of the average drift to be expected from lot to lot.

3. Due to the dropout voltage and output current-limiting characteristics of this device, output current is limited to less than 700 mA

at input-to-output voltage differentials of less than 25 V.


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electrical characteristics at Vl VO= 25 V, IO= 0.5 A, TJ= 25C (unless otherwise noted)

TL783YTEST CONDITIONS

MIN TYP MAX

Input voltage regulation VI VO= 20 V to 125 V, P rated dissipation 0.001 %/V

Ripple rejection VI(PP)= 10 V, VO= 10 V, f = 120 Hz 76 dB

VO 5 V 7.5 mVO= m o m

VO 5 V 0.15%u pu vo age regu a on

VO 5 V 20 mVO= m o m , ra e ss pa on

VO 5 V 0.3%

Output voltage change with

temperature0.4%

Output noise voltage f = 10 Hz to 10 kHz 0.003%

VI VO= 25 V, t = 1 ms 1100

VI VO= 15 V, t = 30 ms 715ea ou pu curren

VI VO= 25 V, t = 30 ms 900m

VI VO= 125 V, t = 30 ms 250

Adjustment-terminal current 83 A

Change in adjustment-

terminal currentVI VO= 15 V to 125 V, IO= 15 mA to 700 mA, P rated dissipation 0.5 A

Reference voltage

(OUT to ADJ)

VI VO= 10 V to 125 V,

See Note 3

IO= 15 mA to 700 mA, P rated dissipation, 1.27 V

Pulse-testing techniques maintain the junction temperature as close to the ambient temperature as possible. Thermal effects must be taken into

account separately. Input voltage regulation is expressed here as the percentage change in output voltage per 1-V change at the input.

NOTES: 2 Since long-term drift cannot be measured on the individual devices prior to shipment, this specification is not intended to be a

guarantee or warranty. It is an engineering estimate of the average drift to be expected from lot to lot.

3 Due to the dropout voltage and output current-limiting characteristics of this device, output current is limited to less than 700 mA

at input-to-output voltage differentials of less than 25 V.


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TYPICAL CHARACTERISTICS

Figure 3

2

1.8

1.6

1.4

1.2

1

0.8

0.6

0.4

0.2

0250 50 75 100 125

OutputCurrentLimitA

VI VO Input-to-Output Voltage Differential V

OUTPUT CURRENT LIMITvs

INPUT-TO-OUTPUT VOLTAGE DIFFERENTIAL

tw= 1 ms

TC= 0C

TC= 25C

TC= 125C

Figure 4

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

2

00 25 50 75 100

OutputCurrentLimitA


INPUT-TO-OUTPUT VOLTAGE DIFFERENTIAL

VI VO Input-to-Output Voltage Differential V

tw= 30 ms

TC= 0C

TC= 25C

TC= 125C

125

Figure 5

0 10 20 30 40

1.6

1.4

1.2

1

0.8

0.6

0.4

0.2

0

OutputCurrentLimitA

Time ms


TIME

VI VO= 25 V

TC= 25C

Figure 6

0 10 20 30 40 50 60 70 80 90

100

80

60

40

20

0

120

RippleRejectiondB

VO Output Voltage V

RIPPLE REJECTIONvs

OUTPUT VOLTAGE

VI(AV) VO= 25 V

VI(PP)= 10 VIO= 100 mA

f = 120 Hz

Co= 0

TJ= 25C

100


7/15





Figure 7

0 100 200 300 400 500 600 700 800

RippleRejectiondB

IO Output Current mA

RIPPLE REJECTIONvs

OUTPUT CURRENT

100

80

60

40

20

0

VI(AV)= 25 V

VI(PP)= 10 V

VO= 10 V

f = 120 Hz

Co= 0

TJ= 25C

Figure 8

100

0.01

90

80

70

60

50

40

30

20

10

0

0.1 1 10 100 1000

Co= 10 F

RippleRejectiondB

f Frequency kHz

RIPPLE REJECTIONvs

FREQUENCY

Co= 0

VI(AV)= 25 V

VI(PP)= 10 V

VO= 10 VIO= 500 mA

TJ= 25C

Figure 9

1

f Frequency kHz

VI= 35 V

VO

= 10 V

IO= 500 mA

TJ= 25C

101 102 103 104 105 106 107

101

102

103

104

101

102

OUTPUT IMPEDANCEvs

FREQUENCY

OutputImpedance

Zo

Figure 10

1.30

1.29

1.28

1.27

1.26

1.25

1.24

1.23

1.2275 50 25 0 25 50 75 100 125 150

ReferenceVoltageV

TJ Virtual Junction Temperature C

REFERENCE VOLTAGEvs

VIRTUAL JUNCTION TEMPERATURE

VI= 20 V

IO= 15 mA

Vref

175


8/15




Figure 11

86

84

82

800 25 50 75

88

INPUT CURRENT AT ADJ

vs


90

100 125


VI= 25 VVO= VrefIO= 500 mA

InputCurrentatADJ

A

Figure 12

20

10

5

075 50 25 0 25 50

DropoutVoltageV

DROPOUT VOLTAGE

vs


75 100 125

25

15


VO= 100 mV

IO= 700 mA

IO= 600 mA

IO= 500 mA

IO= 250 mA

IO= 100 mA

IO= 15 mA

Figure 13

0.2

0.3

0.4

0.50 25 50 75 100 125 150

OutputVoltageDeviation% 0.1

0

OUTPUT VOLTAGE DEVIATION

vs


VO


VI= 25 V

VO= 5 VIO= 15 mA to 700 mA

Figure 14

6

4

2

00 25 50 75

OutputCurrentmA

8

10

12

100 125

OUTPUT CURRENT

vs

INPUT VOLTAGE

IO

VI Input Voltage V

TC= 25C

TC= 125C

TC= 0C

This is the minimum current required to maintain voltage

regulation.


9/15





Figure 15

TJ= 25C

Co= 0

Co= 10 F

0 1 2 3 4

Time s

OutputVoltageDeviationV

VO

ChangeinInputVoltageV

0.4

0.2

0

0.2

1

0.5

0

LINE TRANSIENT RESPONSE

Figure 16

VI= 35 VVO= 10 VCo= 1 FTJ= 25C

OutputCurrentA

IO

6

4

2

0

2

4

6

0.8

0.6

0.4

0.2

00 40 80 120 160 200 240

Time s

LOAD TRANSIENT RESPONSE

OutputVoltageDev

iationV

VO

DESIGN CONSIDERATIONS

The internal reference (see functional block diagram) generates 1.25 V nominal (Vref) between OUT and ADJ.This voltage is developed across R1 and causes a constant current to flow through R1 and the programming

resistor R2, giving an output voltage of:VO=Vref(1 + R2/R1) + lI(ADJ)(R2)

orVO~ Vref(1 + R2/R1).

The TL783C was designed to minimize the input current at ADJ and maintain consistency over line and loadvariations, thereby minimizing the associated (R2) error term.

To maintain II(ADJ)at a low level, all quiescent operating current is returned to the output terminal. This quiescentcurrent must be sunk by the external load and is the minimum load current necessary to prevent the output fromrising. The recommended R1 value of 82 provides a minimum load current of 15 mA. Larger values can beused when the input-to-output differential voltage is less than 125 V (see output current curve, Figure 14) orwhen the load sinks some portion of the minimum current.

bypass capacitors

The TL783C regulator is stable without bypass capacitors; however, any regulator becomes unstable withcertain values of output capacitance if an input capacitor is not used. Therefore, the use of input bypassing isrecommended whenever the regulator is located more than four inches from the power-supply filter capacitor.A 1-F tantalum or aluminum electrolytic capacitor is usually sufficient.


10/15




bypass capacitors (continued)

Adjustment-terminal capacitors are not recommended for use on the TL783C because they can seriouslydegrade load transient response as well as create a need for extra protection circuitry. Excellent ripple rejection

is presently achieved without this added capacitor.

Due to the relatively low gain of the MOS output stage, output voltage dropout may occur under large loadtransient conditions. The addition of an output bypass capacitor greatly enhances load transient response as

well as prevents dropout. For most applications, it is recommended that an output bypass capacitor be usedwith a minimum value of:

Co(F) = 15/VO

Larger values provide proportionally better transient response characteristics.

protection circuitry

The TL783C regulator includes built-in protection circuits capable of guarding the device against most overload

conditions encountered in normal operation. These protective features are current limiting, safe-operating-areaprotection, and thermal shutdown. These circuits protect the device under occasional fault conditions only.

Continuous operation in the current limit or thermal shutdown mode is not recommended.

The internal protection circuits of the TL783C protect the device up to maximum-rated VIas long as certainprecautions are taken. If Vlis instantaneously switched on, transients exceeding maximum input ratings mayoccur, which can destroy the regulator. These are usually caused by lead inductance and bypass capacitorscausing a ringing voltage on the input. In addition, when rise times in excess of 10 V/ns are applied to the input,

a parasitic npn transistor in parallel with the DMOS output can be turned on causing the device to fail. If thedevice is operated over 50 V and the input is switched on rather than ramped on, a low-Q capacitor, such astantalum or aluminum electrolytic should be used rather than ceramic, paper, or plastic bypass capacitors. AQ factor of 0.015 or greater usually provides adequate damping to suppress ringing. Normally, no problemsoccur if the input voltage is allowed to ramp upward through the action of an ac line rectifier and filter network.

Similarly, when an instantaneous short circuit is applied to the output, both ringing and excessive fall times canresult. A tantalum or aluminum electrolytic bypass capacitor is recommended to eliminate this problem.However, if a large output capacitor is used and the input is shorted, addition of a protection diode may benecessary to prevent capacitor discharge through the regulator. The amount of discharge current delivered isdependent on output voltage, size of capacitor, and fall time of Vl. A protective diode (see Figure 17) is requiredonly for capacitance values greater than:

Co(F) = 3 x 104/(VO)

2

Care should always be taken to prevent insertion of regulators into a socket with power on. Power should beturned off before removing or inserting regulators.


11/15





protection circuitry (continued)

IN

TL783C

OUT VO

R1

R2

ADJ

VI

Co

Figure 17. Regulator With Protective Diode

load regulation

The current set resistor (R1) should be located close to the regulator output terminal rather than near the load.This eliminates long line drops from being amplified through the action of R1 and R2 to degrade load regulation.To provide remote ground sensing, R2 should be near the load ground.

VI

TL783C

R1

Rline

RL

R2

VO

IN OUT

ADJ

Figure 18. Regulator With Current-Set Resistor


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APPLICATION INFORMATION

VI= 125 V

TL783C

IN OUT

ADJ

1 F

0 to 8 k

10 F

Needed if device is more than 4 inches from filter capacitor

R2

R182

++

VO

V

ref 1

R2R1

Figure 19. 1.25-V to 115-V Adjustable Regulator Figure 20. 125-V Short-Circuit-Protected Off-LineRegulator

10 F

0.1 F

IN

OUT

ADJ

R2

8.2 k, 2W

125 V

120 V, 1.5 W

7.5 k, 1 W

VI = 145 to 200 V

TIP150

TL783CR1

82

+

50 F

82

+

VI= 70 to 125 V

10

1 k

TIP30C

TIPL762

VO= 50 V

at 0.5 A

TL783C

3.3 k,1W

10 k

Figure 21. 50-V Regulator With Current Boost

IN

OUT

ADJ

Figure 22. Adjustable Regulator With CurrentBoost and Current Limit

50 F+

125 V

10

1 k TIPL762

1

R2

TL783C

R1

82

VO

V

ref 1

R2R1

10 kIN

OUT

ADJ


13/15




APPLICATION INFORMATION

Figure 23. Current-Sinking Regulator

VI

Load

R

I V

refR

IN

OUT

ADJ

TL783C

Figure 24. Current-Sourcing Regulator

VI

1 F

R

I

VrefR

TL783C

Load

IN

OUT

ADJ

Figure 25. High-Voltage Unity-Gain Offset Amplifier

V +

INPUT

V

TL081

R2

OUTPUT

VCC

1 F

+

TL783C

82

VOFFSET

Vref

I R282

IN

OUT

ADJ

Figure 26. 48-V, 200-mA Float Charger

6.25

48 V

82

3.9 k

VI= 90 V

TL783C

TL783C

IN

OUT

ADJ

IN

OUT

ADJ


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MECHANICAL DATA

KC (R-PSFM-T3) PLASTIC FLANGE-MOUNT PACKAGE

4040207/ B 01/95

(see Note F)

0.185 (4,70)

0.270 (6,86)

0.230 (5,84)

0.175 (4,46)

(see Note H)

0.052 (1,32)

0.048 (1,22)

0.122 (3,10)

0.102 (2,59)

0.025 (0,64)

0.012 (0,30)

0.420 (10,67)

MAX

0.250 (6,35)

0.380 (9,65)

(see Note H)0.146 (3,71)

0.156 (3,96)DIA

0.125 (3,18)

(see Note C)

3

0.070 (1,78)

0.045 (1,14)

1

0.035 (0,89)

0.029 (0,74)

0.625 (15,88)

0.562 (14,27)

0.500 (12,70)

0.560 (14,22)

0.120 (3,05)

0.100 (2,54)

0.100 (2,54)M0.010 (0,25)

0.200 (5,08)

NOTES: A. All linear dimensions are in inches (millimeters).

B. This drawing is subject to change without notice.

C. Lead dimensions are not controlled within this area.

D. All lead dimensions apply before solder dip.E. The center lead is in electrical contact with the mounting tab.

F. The chamfer is optional.

G. Falls within JEDEC TO-220AB

H. Tab contour optional within these dimensions


15/15

IMPORTANT NOTICE

Texas Instruments (TI) reserves the right to make changes to its products or to discontinue any semiconductor

product or service without notice, and advises its customers to obtain the latest version of relevant information

to verify, before placing orders, that the information being relied on is current.

TI warrants performance of its semiconductor products and related software to the specifications applicable at

the time of sale in accordance with TIs standard warranty. Testing and other quality control techniques areutilized to the extent TI deems necessary to support this warranty. Specific testing of all parameters of each

device is not necessarily performed, except those mandated by government requirements.

Certain applications using semiconductor products may involve potential risks of death, personal injury, or

severe property or environmental damage (Critical Applications).

TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, INTENDED, AUTHORIZED, OR WARRANTED

TO BE SUITABLE FOR USE IN LIFE-SUPPORT APPLICATIONS, DEVICES OR SYSTEMS OR OTHER

CRITICAL APPLICATIONS.

Inclusion of TI products in such applications is understood to be fully at the risk of the customer. Use of TI

products in such applications requires the written approval of an appropriate TI officer. Questions concerning

potential risk applications should be directed to TI through a local SC sales office.

In order to minimize risks associated with the customers applications, adequate design and operating

safeguards should be provided by the customer to minimize inherent or procedural hazards.

TI assumes no liability for applications assistance, customer product design, software performance, or

infringement of patents or services described herein. Nor does TI warrant or represent that any license, either

express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property

right of TI covering or relating to any combination, machine, or process in which such semiconductor products

or services might be or are used.

Copyright 1996, Texas Instruments Incorporated

Documents

TL 783C,Y High Voltage Adjustable Regulator