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8

DEMO MANUAL DC2787A

Rev. 0

ITEM

QTY REFERENCE

PART DESCRIPTION

MANUFACTURER/PART NUMBER

25

4

R2, R36, R53, R56

RES.,AEC-Q200,1 OHM,5%,1/10W,0603

VISHAY, CRCW06031R00JNEA

26

43

R5, R10-R12, R14, 

R20, R24, R32, R33, 

R35, R40, R41, R45, 

R47, R50, R51, R76, 

R226-R231, R240, R241, 

R246, R252, R254-R256, 

R258, R264, R266-R268, 

R270, R271, R273-R276, 

R278, R279

RES.,0 OHM,1/10W,0603

VISHAY, CRCW06030000Z0EA

27

1

R6

RES.,AEC-Q200,1M OHM,1%,1/8W,0805

PANASONIC, ERJ6ENF1004V

28

1

R8

RES.,34k OHMS,1%,1/10W,0603

NIC, NRC06F3402T

29

9

R9, R13, R22, R28, R49, 

R60, R62, R272, R277

RES.,AEC-Q200,10k OHMS,1%,1/10W,0603

VISHAY, CRCW060310K0FKEA

30

4

R15, R37, R52, R57

RES.,100k OHMS,1%,1/10W,0603

VISHAY, CRCW0603100KFKEA

31

4

R16, R48, R64, R68

RES.,53.6k OHMS,1%,1/10W,0603,AEC-Q200

VISHAY, CRCW060353K6FKEA

32

4

R17, R43, R70, R71

RES.,AEC-Q200,6.81k OHMS,1%,1/8W,0805

VISHAY, CRCW08056K81FKEA

33

1

R18

RES.,3.74k OHMS,1%,1/10W,0603

PANASONIC, ERJ3EKF3741V

34

4

R23, R75, R244, R259

RES.,AEC-Q200,60.4k OHMS,1%,1/10W,0603

VISHAY, CRCW060360K4FKEA

35

4

R25, R66, R245, R248

RES.,AEC-Q200,4.32k OHMS,1%,1/10W,0603

VISHAY, CRCW06034K32FKEA

36

1

R26

RES.,182k OHMS,1%,1/10W,0603,AEC-Q200

PANASONIC, ERJ3EKF1823V

37

1

R27

RES.,20k OHMS,5%,1/10W,0603,AEC-Q200

NIC, NRC06J203TRF

38

1

R29

RES.,80.6k OHMS,1%,1/10W,0603

VISHAY, CRCW060380K6FKEA

39

2

R30, R247

RES.,0.2 OHM,1%,1/2W,2010,SENSE, AEC-Q200

VISHAY, WSL2010R2000FEA

40

1

SW1

SWITCH,SLIDE,DPDT,0.3A,6VDC,PTH

C&K, JS202011CQN

41

4

U1-U4

IC, Hybrid Step-Down Synchronous Controller QFN-32 ANALOG DEVICES, LTC7821EUH#PBF

42

1

U7

IC, SYNCHRONOUS STEP-DOWN CONVERTER

ANALOG DEVICES, LTC3630AEMSE#PBF

Additional Demo Board Circuit Components

1

0

C16, C46, C48, C51, 

C160, C171, C172, 

C290-C295

CAP., OPTION, 0603

2

0

Q1A, Q1A1, Q11A, 

Q11A1, Q22, Q22A, 

Q22A1-Q22A3, Q25, Q26, 

Q29, Q30, Q33, Q34, Q37

XSTR., OPTION, MOSFET N-CH, PPAK SO-8

3

0

Q23, Q24, Q27, Q28, 

Q31, Q32, Q35, Q36

XSTR., OPTION, MOSFET N-CH, PG-TDSON-8

4

0

R3, R31, R34, R44, R46, 

R65, R74, R234, R235, 

R250, R251, R253, 

R262, R263, R265

RES., OPTION, 0603

5

0

RN1-RN4

THERMISTOR, OPTION, 0603

PARTS LIST

Summary of Contents for 2787A

Page 1: ...the property of their respective owners PERFORMANCE SUMMARY voltage ripple to enable much higher power applications Other benefits include low EMI emissions due to a soft switched front end and reduced MOSFET stress The LTC7821 design eliminates the inrush current typically associated with switched capacitor circuits by prebalancing the capacitors on start up The LTC7821 also monitors sys tem volt...

Page 2: ...2 DEMO MANUAL DC2787A Rev 0 BOARD PHOTO Figure 1 4x LTC7821 100A DC2787A Demo Circuit ...

Page 3: ...hin the operating range and measure the efficiency output ripple voltage and other parameters 9 After completing all tests adjust the load to 0A power off the input power supply Notes 1 When measuring the output or input voltage ripple 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 termina...

Page 4: ...4 DEMO MANUAL DC2787A Rev 0 QUICK START PROCEDURE V Load 0 100A 1mΩ V V VIN 40V 60V A Figure 2 Proper Measurement Equipment Setup Figure 3 Measuring Output Voltage Ripple ...

Page 5: ...g vs Load Current at VIN 48V VOUT 12V fSW 400kHz DC2787A F04 90 92 94 96 98 100 0 20 40 60 80 100 EFFICIENCY 40VIN 48VIN 60VIN OUTPUT LOAD CURRENT A DC2787A F05 0 5 10 15 20 25 30 0 20 40 60 80 100 LOAD CURRENT PER PHASE A TOTAL LOAD CURRENT A PHASE 1 PHASE 2 PHASE 3 PHASE 4 Efficiency vs Load Current Current Sharing vs Load Current ...

Page 6: ... DIV VOUT 20MHz BW 100mV DIV 50A 75A 50A LOAD 20A DIV 2787A F06 Figure 6 Load Step at VIN 48V VOUT 12V Figure 7 Thermal performance VIN 48V VOUT 12V IOUT 100A TA 23 C No Airflow Figure 8 Thermal performance VIN 48V VOUT 12V IOUT 100A A 23 C 200LFM Airflow ...

Page 7: ...V 10 0603 AVX 06033C472KAT2A 10 8 C42 C44 C57 C84 C89 C97 C152 C155 CAP 150uF ALUM OS CON 16V 20 8x6 9mm SMD RADIAL PANASONIC 16SVPC150M 11 4 C45 C110 C156 C215 CAP 27pF C0G 250V 5 0603 MURATA GQM1875C2E270JB12D 12 2 C52 C53 CAP 22uF X5R 25V 10 1210 MURATA GRM32ER61E226KE15K 13 1 C54 CAP 0 047uF X7R 25V 10 0603 AVX 06033C473KAT2A 14 1 C55 CAP 220pF C0G 50V 5 0603 AVX 06035A221JAT2A 15 4 C255 C257 ...

Page 8: ...741V 34 4 R23 R75 R244 R259 RES AEC Q200 60 4k OHMS 1 1 10W 0603 VISHAY CRCW060360K4FKEA 35 4 R25 R66 R245 R248 RES AEC Q200 4 32k OHMS 1 1 10W 0603 VISHAY CRCW06034K32FKEA 36 1 R26 RES 182k OHMS 1 1 10W 0603 AEC Q200 PANASONIC ERJ3EKF1823V 37 1 R27 RES 20k OHMS 5 1 10W 0603 AEC Q200 NIC NRC06J203TRF 38 1 R29 RES 80 6k OHMS 1 1 10W 0603 VISHAY CRCW060380K6FKEA 39 2 R30 R247 RES 0 2 OHM 1 1 2W 2010...

Page 9: ... 3 2 J5 J6 CONN RF BNC RCPT JACK 5 PIN STR THT 50 Ohms AMPHENOL RF 112404 4 4 J1 J4 RING LUG CRIMP 10 NON INSULATED SOLDERLESS TERMINALS KEYSTONE 8205 5 8 J1 J4 NUT HEX 10 32 BRASS PENCOM NU1132 6 1 JP2 CONN HDR MALE 1x3 2mm STR THT NO SUBS ALLOWED Wurth Elektronik 62000311121 7 4 J1 J4 WASHER 10 LOCK EXT TIN FINISH PENCOM WA4526 8 6 MH1 MH6 STANDOFF NYLON SNAP ON 0 625 KEYSTONE 8834 9 1 XJP2 CONN...

Page 10: ... CUSTOMER NOTICE ANALOG DEVICES INC HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER SUPPLIED SPECIFICATIONS HOWEVER IT REMAINS THE CUSTOMER S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY CONTACT ANALOG DEVICES INC APPLICATIONS ENGINE...

Page 11: ... DC2787A_REV03 705 DC2787A_REV03 N A Thursday May 16 2019 CONVERTER C127 C132 R40 0 C290 OPT C147 C106 0 22uF C122 C139 10uF 100V 1210 C292 OPT C86 2 2uF 1210 100V C125 10uF 100V 1210 C128 R255 0 C95 0 1uF D6 CMDSH 4E 2 1 C107 0 1uF C111 10uF 100V 1210 C143 C293 OPT R37 100k Q8 BSC014N04LSI 4 5 6 7 8 3 1 2 U2 LTC7821EUH MODE PLLIN 1 CLKOUT 2 RUN 3 FAULTB 4 PGOOD 5 TIMER 6 TRACK SS 7 EXT_REF 8 ISEN...

Page 12: ...MO CIRCUIT SCHEMATIC APPROVALS PCB DES APP ENG Phone 1 408 432 1900 Milpitas CA 95035 1630 McCarthy Blvd For ADI Customer Use Only CUSTOMER NOTICE ANALOG DEVICES INC HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER SUPPLIED SPECIFICATIONS HOWEVER IT REMAINS THE CUSTOMER S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION COMPONENT SUBSTITUTION AND PRINT...

Page 13: ...2787A_REV03 710 DC2787A_REV03 705 DC2787A_REV03 N A Thursday May 16 2019 CONVERTER C138 R264 0 C185 10uF 100V 1210 R267 0 R74 OPT Q37 OPT 4 5 6 7 8 3 1 2 C136 C209 2 2uF 1210 100V C291 OPT C188 C180 100V J6 IOSTEP C210 2 2uF 1210 100V R68 53 6k 1 R59 1k R235 OPT C157 2 2uF Q14 BSC014N04LSI 4 5 6 7 8 3 1 2 C149 1210 E9 GND C47 2 2uF 1210 J5 VOUT R278 0 C116 RN4 OPT t R268 0 Q11A1 OPT 5 6 7 4 2 3 8 ...

Page 14: ...disclose or transfer any portion of the Evaluation Board to any other party for any reason Upon discontinuation of use of the Evaluation Board or termination of this Agreement Customer agrees to promptly return the Evaluation Board to ADI ADDITIONAL RESTRICTIONS Customer may not disassemble decompile or reverse engineer chips on the Evaluation Board Customer shall inform ADI of any occurred damage...

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