1

DEMO MANUAL DC2798A

Rev. 0

DESCRIPTION

LTC784160V Dual-Phase Single Output Synchronous

Boost Controller with PMBus

Demonstration circuit 2798A is a high voltage, dual-phase single output boost converter with 10V to 16V input range. The output voltage is adjustable from VIN to 48V. And the output can supply a 10A maximum load current. The demo board has a LTC7841 controller, which is a 60V dual-phase single output boost controller with digital power system management. Please see the LTC7841 data sheet for more detailed information.

The DC2798A powers up to default settings and pro-duces power based on the command from the serial bus communication. This allows easy evaluation of the DC/DC converter. To fully explore the extensive power sys-tem management features of the part, download the GUI

All registered trademarks and trademarks are the property of their respective owners.

BOARD PHOTO

software LTpowerPlay® onto your PC and use ADI’s I2C/SMBus/PMBus dongle DC1613A to connect to the board. LTpowerPlay allows the user to reconfigure the part on-the-fly, view telemetry of voltage, current, temperature and fault status.

GUI Download

The software can be downloaded from:

LTpowerPlay

For more details and instructions of LTpowerPlay, please refer to LTpowerPlay GUI for LTC7841 Quick Start Guide.

Design files for this circuit board are available.

Figure 1. Single-Output LTC7841/DC2798A Demo Circuit

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DEMO MANUAL DC2798A

Rev. 0

QUICK START PROCEDUREDemonstration circuit DC2798A is easy to set up to evalu-ate the performance of the LTC7841. Refer to Figure 2 for the proper measurement equipment set-up and follow the procedure below.

1. With power off, connect the input power supply to VIN (10V to 16V) and GND (input return).

2. Connect the 48V output load between VOUT0 and GND (Initial load: No Load).

3. Connect the DVMs to the input and outputs. Set default jumper position: JP1: 100mV (ILIM); JP2: FLOAT; JP3: CCM; JP4: ON.

4. Connect the dongle to DC2798A and turn on the input power supply.

5. Follow the LTpowerPlay Quick Start Procedure section to set the proper output voltage.

6. Once the proper output voltages are established, adjust the loads within the operating range and ob-serve the output voltage regulation, ripple voltage and other parameters.

NOTE: When measuring the output or input voltage rip-ple, do not use the long ground lead on the oscilloscope probe. See Figure 3 for the proper scope probe technique. Short, stiff leads need to be soldered to the (+) and (–) terminals of an output capacitor. The probe’s ground ring needs to touch the (–) lead and the probe tip needs to touch the (+) lead.

PERFORMANCE SUMMARY Specifications are at TA = 25°C

PARAMETER CONDITIONS MIN TYP MAX UNITS

Input Voltage Range 10 16 V

Output Voltage, VOUT VIN = 10V to 16V, IOUT = 0A to 10A 16 48 (Default) V

Maximum Output Current, IOUT VIN = 10V to 16V, VOUT = 16V to 48V 10 A

Typical Efficiency VIN =12V, VOUT = 48V, IOUT = 10A 97.4 (See Figure 5) %

Default Switching Frequency 150 kHz

Figure 2. Proper Measurement Equipment Set-Up

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DEMO MANUAL DC2798A

Rev. 0

QUICK START PROCEDURE

Figure 3. Measuring Output Voltage Ripple

+ –

VOUT GND

COUT

Figure 4. Demo Set-Up with PC

Connecting a PC to DC2798A

You can use a PC to configure the power management features of the LTC7841 such as: nominal VOUT, margin

set points, ON/OFF control. The DC1613A dongle may be plugged when VIN is present.

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DEMO MANUAL DC2798A

Rev. 0

QUICK START PROCEDURE

Figure 5. Efficiency vs Load Current at VIN = 12V, fS = 150kHz, VOUT = 48V

Figure 6. VOUT Load Transient Response at VIN = 12V, VOUT = 48V Figure 7. VOUT Voltage Ripple at VIN = 12V, VOUT = 48V, IOUT = 10A

LOAD CURRENT (A)0

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100

91

99

97

95

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98

96

94

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dc2798a F05

104 82 6

200μs/DIVdc2798A F06

VOUT20MHz BW100mV/DIV

0A TO 2.5ALOAD STEP

5μs/DIV dc2798A F07

VOUT20MHz BW200mV/DIV

Figure 8. Thermal at VIN = 12V, VOUT = 48V, IOUT = 10A, TA = 25°C, No Airflow

5

DEMO MANUAL DC2798A

Rev. 0

LTPOWERPLAY SOFTWARE GUI

Figure 9. LTpowerPlay Main Interface

LTpowerPlay is a powerful Windows-based development environment that supports Analog Devices power sys-tem management ICs and μModules, including LTM4675, LTM4676, LTM4677, LTM4678, LTM4680, LTM4700, LTM4664, LTC3880, LTC3882, LTC3883, LTC3884, LTC7880 and LTC7841. The software supports a variety of different tasks. You can use LTpowerPlay to evaluate Analog Devices ICs by connecting to a demo board sys-tem. LTpowerPlay provides unprecedented diagnostic and debug features. It becomes a valuable diagnostic tool dur-ing board bring-up to program or tweak the power man-agement scheme in a system, or to diagnose power issues when bringing up rails. LTpowerPlay utilizes the DC1613A USB-to-SMBus controller to communicate with one of

many potential targets, including LTM4675, LTM4676, LTM4677, LTM4678, LTM4680, LTM4700, LTM4664, LTC3880, LTC3882, LTC3883, LTC3884, LTC7880 and LTC7841’s demo system, or a customer board. The soft-ware also provides an automatic update feature to keep the software current with the latest set of device drivers and documentation. The LTpowerPlay software can be downloaded from:

LTpowerPlay

To access technical support documents for LTC Digital Power Products visit the LTpowerPlay Help menu. Online help also available through the LTpowerPlay.

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DEMO MANUAL DC2798A

Rev. 0

LTPOWERPLAY QUICK START PROCEDUREThe following procedure describes how to use LTpowerPlay to monitor and change the settings of LTC7841.

1. Download and install the LTPowerPlay GUI:

LTpowerPlay

2. Launch the LTpowerPlay GUI.

a. The GUI should automatically identify the DC2798A. The system tree on the left hand side should look like this:

b. A green message box shows for a few seconds in the lower left-hand corner, confirming that LTC7841 is communicating:

c. Writing to the MFR_VOUT_COMMAND register via the PMBus allows the adjustment of the VOUT reference from 0% to 100% of the maximum reference of 2.4V. With current demo board setting (R193 = 191k, and R194 = 10k), the VFB/VOUT ratio is about 1/20. Follow Equation 1 to get the correct VOUT.

VOUT = 20 • MFR_VOUT_COMMAND (%) • 2.4 (1)

If you want to set the output voltage to be 48V. In the Config tab, type in 99.8 in the MFR_VOUT_COMMAND_LTC7841 box, like this:

Then, click the “W” (PC to RAM) icon to write these register values to the LTC7841. After finishing this step, the VOUT internal reference voltage is set to ~2.4V.

If the write is successful, you will see the following message:

7

DEMO MANUAL DC2798A

Rev. 0

LTPOWERPLAY QUICK START PROCEDUREd. If you want to set the output voltage to be 24V. In the

Config tab, type in 50 in the MFR_VOUT_COMMAND_LTC7841 box. Then the VOUT internal reference voltage is set to ~1.2V.

e. In order to turn on the power stage, click the “Apply an operation to all devices” icon

f. In the popup “Apply an operation to all devices” dialog box, click the “On” button to turn on the power stage

g. After the test, in the popup “Apply an operation to all devices” dialog box, click the “Immediate Off” button to turn off the power stage.

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DEMO MANUAL DC2798A

Rev. 0

PARTS LISTITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 4 C1, C85-C87 CAP., 470µF, ALUM POLY HYB, 25V, 20%, 10x10.2mm, G, SMD, RADIAL, AEC-Q200

PANASONIC, EEHZK1E471P

2 3 C3, C105, C120 CAP., 4.7µF, X5R, 25V, 10%, 0603 MURATA, GRM188R61E475KE15D

3 2 C9, C23 CAP., 0.22µF, X7R, 25V, 10%, 0603 MURATA, GRM188R71E224KA88D

4 10 C10-C12, C24-C26, C88, C93, C122, C123

CAP., 10µF, X7R, 63V, 10%, 1210 SAMSUNG, CL32B106KMVNNWE

5 2 C13, C28 CAP., 0.01µF, X7R, 16V, 10%, 0603 AVX, 0603YC103KAT2A

6 1 C18 CAP., 0.01µF, X7R, 25V, 10%, 0603, AEC-Q200 AVX, 06033C103K4Z2A

7 1 C20 CAP., 100pF, C0G/NP0, 50V, 5%, 0603 AVX, 06035A101JAT2A

8 2 C71, C77 CAP., 1000pF, C0G, 100V, 5%, 0805 TDK, C2012C0G2A102J060AA

9 4 C94, C95, C115, C116 CAP., 22µF, X7R, 25V, 10%, 1210 SAMSUNG, CL32B226KAJNNNE

10 1 C104 CAP., 470pF, X7R, 50V, 10%, 0603 AVX, 06035C471KAT2A

11 2 C106, C117 CAP., 0.1µF, X7R, 100V, 10%, 0603 AVX, 06031C104KAT2A

12 8 C107-C114 CAP., 68µF, ALUM POLY HYB, 63V, 20%, 10x10.2mm, G, SMD, RADIAL, AEC-Q200

PANASONIC, EEHZC1J680P

13 1 C118 CAP., 120pF, C0G/NPO, 100V, 5%, 0603 AVX, 06031A121JAT2A

14 1 C119 CAP., 1000pF, X7R, 16V, 10%, 0603 WURTH ELEKTRONIK, 885012206034

15 1 C121 CAP., 390pF, COG/NPO, 50V, 5%, 0603 AVX, 06035A391JAT2A

16 1 C124 CAP., 2.2µF, X7S, 16V, 10%, 0603, AEC-Q200 TDK, CGA3E1X7S1C225K080AC

17 2 C125, C126 CAP., 1µF, X7S, 100V, 10%, 0805 MURATA, GRJ21BC72A105KE11L

18 2 D1, D2 DIODE, SCHOTTKY, 100V, 1A, POWERDI-123 DIODES INC., DFLS1100-7

19 1 D5 DIODE, ZENER, 6.8V, 400mW, SOD-323 NEXPERIA, PDZ6.8B, 115

20 2 L1, L2 IND., 6.8µH, POWER SHIELDED WIREWOUND, 10%, 30A, 0.00205Ω, 27.9mm x 27.94mm

COILCRAFT, SER2915H-682KL

21 4 Q1, Q2, Q5, Q6 XSTR., MOSFET, N-CH, 60V, 64A, PG-TDSON-8 INFINEON, BSC065N06LS5

22 4 Q3, Q4, Q7, Q8 XSTR., MOSFET, N-CH, 60V, 100A, PG-TDSON-8 INFINEON, BSC027N06LS5

23 3 R13, R15, R194 RES., 10k, 1%, 1/10W, 0603 VISHAY, CRCW060310K0FKEC

24 2 R14, R37 RES., 0.002Ω, 1%, 3W, 2512, METAL, SENSE, AEC-Q200 PANASONIC, ERJMS4SF2M0U

25 2 R21, R44 RES., 100Ω, 1%, 1/10W, 0603, AEC-Q200 PANASONIC, ERJ3EKF1000V

26 2 R90, R92 RES., 1.0Ω, 5%, 1/2W, 0805 PANASONIC, ERJ6DQJ1R0V

27 1 R183 RES., 5.1k, 1%, 1/10W, 0603, AEC-Q200 NIC, NRC06F5101TRF

28 1 R185 RES., 470k, 1%, 210mW, 0805, NTC THERMISTOR, AEC-Q200 VISHAY, NTCS0805E3474FXT

29 3 R192, R198, R199 RES., 100k, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW0603100KFKEA

30 1 R193 RES., 191k, 1%, 1/10W, 0603 VISHAY, CRCW0603191KFKEA

31 1 R200 RES., 30k, 1%, 1/10W, 0603, AEC-Q200 KOA SPEER, RK73H1JTTD3002F

32 1 R201 RES., 38.3k, 1%, 1/10W, 0603, AEC-Q200 NIC, NRC06F3832TRF

33 1 R202 RES., 150k, 1%, 1/10W, 0603 PANASONIC, ERJ3EKF1503V

34 1 U1 IC, POWER CONTROLLER, QFN-36 (5x6) ANALOG DEVICES., LTC7841EUHE#PBF

9

DEMO MANUAL DC2798A

Rev. 0

PARTS LISTITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Additional Demo Board Circuit Components

1 1 C5 CAP., 0.1µF, X7R, 50V, 10%, 0603 AVX, 06035C104KAT2A

2 0 C19, C35 CAP., OPTION, 0603

3 1 D3 LED, GREEN, WATERCLEAR, 1206 WURTH ELEKTRONIK, 150120GS75000

4 1 D4 LED, RED, WATERCLEAR, 1206 WURTH ELEKTRONIK, 150120RS75000

5 0 D6 DIODE, OPTION, SCHOTTKY, POWERDI 123

6 1 Q9 XSTR., MOSFET N-CH, 60V, 300mA, SOT-23 VISHAY, 2N7002K-T1-GE3

7 1 Q10 XSTR., MOSFET, P-CH, 20V, 5.9A, TO-236 (SOT23-3) VISHAY, Si2365EDS-T1-GE3

8 0 R11, R19, R20, R42, R47, R187, R196

RES., OPTION, 0603

9 8 R12, R17, R22, R38, R43, R184, R186, R188

RES., 0Ω, 1/10W, 0603, AEC-Q200 VISHAY, CRCW06030000Z0EA

10 2 R16, R197 RES., 4.99k, 1%, 1/10W, 0603 PANASONIC, ERJ3EKF4991V

11 1 R27 RES., 200Ω, 1%, 1/10W, 0603 VISHAY, CRCW0603200RFKEA

12 1 R28 RES., 127Ω, 1%, 1/10W, 0603, AEC-Q200 NIC, NRC06F1270TRF

13 1 U2 IC, MEMORY, EEPROM, 2Kb (256x8), TSSOP-8, 400kHz MICROCHIP, 24LC025-I/ST

Hardware For Demo Board Only

1 16 E1-E7, E10, E15, E22, E37-E40, E42, E44

TEST POINT, TURRET, 0.094" MTG. HOLE, PCB 0.062" THK MILL-MAX, 2501-2-00-80-00-00-07-0

2 4 J1-J4 EVAL BOARD STUD HARDWARE SET, #10-32 ANALOG DEVICES, 720-0010

3 1 J5 CONN., HDR, SHROUDED, MALE, 2×6, 2mm, VERT, ST, THT FCI, 98414-G06-12ULF

4 1 J6 CONN., HDR, FEMALE, 2×4, 2mm, R/A THT SULLINS CONNECTOR SOLUTIONS, NPPN042FJFN-RC

5 1 J7 CONN., HDR, MALE, 2×4, 2mm, R/A THT MOLEX, 87760-0816

6 2 JP1, JP2 CONN., HDR, MALE, 1×4, 2mm, VERT, ST, THT SAMTEC, TMM-104-02-L-S

7 1 JP3 CONN., HDR., MALE, 2×3, 2mm, VERT, ST, THT WURTH ELEKTRONIK, 62000621121

8 1 JP4 CONN., HDR, MALE, 1×3, 2mm, VERT, ST, THT WURTH ELEKTRONIK, 62000311121

9 4 MP1-MP4 STANDOFF, NYLON, SNAP-ON, 0.625 (5/8"), 15.9mm KEYSTONE, 8834

10 4 XJP2, XJP7-XJP9 CONN., SHUNT, FEMALE, 2-POS, 2mm SAMTEC, 2SN-BK-G

10

DEMO MANUAL DC2798A

Rev. 0

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SCHEMATIC DIAGRAM

11

DEMO MANUAL DC2798A

Rev. 0

Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

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A

SCHEMATIC DIAGRAM

12

DEMO MANUAL DC2798A

Rev. 0

ANALOG DEVICES, INC. 2020

03/20www.analog.com

ESD Caution ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.

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