Linear Technology LTC3725 Quick Start Manual Download Page 10

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1031A-C 

36V-72VIN, SYNCHRONOUS FORWARD CONVERTER  

 

 

10

 

Item  Qty 

Reference 

Part Description 

Manufacture / Part # 

  

  

 

  

  

  REQUIRED CIRCUIT COMPONENTS

1

 

C2,C3,C4,C5 

CAP., X7R, 1.0uF, 100V, 20%, 1210 

TDK, C3225X7R2A105M 

C71,C24 

CAP., X7R, 1uF, 16V 10%, 0805 

TAIYO YUDEN, EMK212BJ105KG 

C27,C70 

CAP., X7R, 330pF, 25V, 10%, 0603 

AVX, 06033C331KAT2A 

C29,C78 

CAP., X7R, 33nF, 25V, 10%, 0603 

AVX, 06033C333KAT2A 

C30 

CAP., X7R, 2.2nF, 250V, 10%, 1812 

MURATA, GA343QR7GD222KW01L 

C31,C33 

CAP., X5R, 100uF, 6.3V, 20%, 1210 

TDK, C3225X5R0J107M 

C73,C55 

CAP., C0G, 470pF, 25V, 10%, 0603 

AVX, 06033A471KAT2A 

C66 

CAP., C0G, 1nF, 200V, 10%, 1206 

AVX, 12062A102KAT2A 

C67 

CAP., X7R, 4.7uF, 25V, 20%, 1206 

TDK, C3216X7R1E475M 

10 

C68 

CAP., POSCAP, 220uF, 6.3V, 20% 7343 

SANYO, 6TPE220MI 

11 

C69 

CAP., NPO, 1.5nF, 50V, 10%, 0805 

AVX, 08055A152KAT2A 

12 

C72 

CAP., X7R, 0.1uF, 25V, 10%, 0805 

AVX, 08053C104KAT2A 

13 

C75 

CAP., NPO, 47pF, 25V, 10%, 0603 

AVX, 06033A470KAT2A 

14 

C77 

CAP., X7R, 2.2uF, 16V, 20%, 1206 

TDK, C3216X7R1C225M 

15 

C79 

CAP., X7R, 2.2nF, 25V, 10%, 0603 

AVX, 06033C222KAT2A 

16 

C81 

CAP., C0G, 10pF, 50V, 5%, 0603 

AVX, 06035A100JAT2A 

17 

D1 

DIODE, Schottky, CMPSH1-4, 40V, SOT23 

CENTRAL SEMI., CMPSH1-4-LTC 

18 

D28 

Diode, MMBZ5236B, SOT23 

DIODES INC., MMBZ5236B-7 

19 

D29 

Diode, 1N4148W     SOD-123 

DIODES INC., 1N4148W-7-F 

20 

L1 

INDUCTOR, 1.0uH 

VISHAY DALE, IHLP2525CZER1R0M01 

  

L1  (second source) 

INDUCTOR, 1.0uH 

COOPER, HCP0703-1R0-R 

21 

L2 

INDUCTOR, 0.87uH 

COOPER, HC1-R87 

22 

Q8 

FET, N-CH,. Si7450DP, POWERPAK SO-8 

VISHAY, Si7450DP 

23 

Q12,Q14 

FET, N-CH,. Si7336ADP, POWERPAK SO-8 

VISHAY, Si7336ADP 

24 

Q34 

N-CH., Transistor.  2N7002  SOT23 

DIODES INC., 2N7002-7-F 

25 

Q27 

NPN TRANSISTOR, FCX491 

ZETEX, FCX491 

26 

Q28 

N-CH FET, 150V, FDC2512, Super SOT-6 

FAIRCHILD, FDC2512 

27 

R2 

RES., CHIP, 1.2, 1/4W, 5%, 1206 

AAC, CR18-1R2JM 

28 

R54,R55 

RES., CHIP, 100, 1/16W, 1%, 0603 

VISHAY, CRCW06031000FRT6 

29 

R18 

RES., CHIP, 365K, 1/8W, 1%, 0805 

VISHAY, CRCW0805365KFKEB 

30 

R22 

RES., CHIP, 15.0K, 1/16W, 1%, 0603 

AAC, CR16-1502FM 

31 

R29 

RES., CHIP, 100K, 1/8W, 5%, 0805 

AAC, CR10-104JM 

32 

R41 

RES., CHIP, 4.42K, 1/16W,1%, 0603 

AAC, CR16-4421FM 

33 

R46 

RES., CHIP, 604, 1/16W, 1%, 0603 

AAC, CR16-6040FM 

34 

R48 

RES., CHIP, 0.022, 1W, 2%, 2010 

IRC, LRC-LRF2010-01-R022-G 

35 

R50 

RES., CHIP, 0.002, 1W, 1%, 2512 

PANASONIC, ERJM1WTF2M0U 

36 

R51 

RES., CHIP, 2.4, 1/4W, 5%, 1206 

AAC, CR18-2R4JM 

37 

R58 

RES., CHIP, 5.1K, 1/16W, 5%, 0603 

AAC, CR16-512JM 

38 

R3,R61 

RES., CHIP, 100, 1/16W, 5%, 0603 

AAC, CR16-101JM 

39 

R63,R66 

RES., CHIP, 100K, 1/16W, 5%, 0603 

AAC, CR16-104JM 

40 

R68 

RES., CHIP, 6.2K, 1/16W, 5%, 0603 

AAC, CR16-622JM 

41 

R69 

RES., CHIP, 124K, 1/16W, 1%, 0603 

AAC, CR16-1243FM 

42 

R76 

RES., CHIP, 1K, 1/4W, 5%, 1206 

AAC, CR18-102JM 

43 

R79 

RES., CHIP, 510, 1/8W, 5%, 0805 e3 

AAC, CR10-511JM 

44 

R85 

RES., CHIP, 3.01K, 1/16W, 1%, 0603 

AAC, CR16-3011FM 

Summary of Contents for LTC3725

Page 1: ...ettling Time 40us Nominal Switching Frequency 300kHz Efficiency VIN 48V IOUT 20A 91 5 Typical OPERATING PRINCIPLES The LTC3726 controller is used on the secondary and the LTC3725 driver with self starting capability is used on the primary When an input voltage is ap plied the LTC3725 begins a controlled soft start of the output voltage As this voltage begins to rise the LTC3726 secondary controlle...

Page 2: ...he input supply in order to meas ure the DC1031A C s input current c A voltmeter with a capability of measuring at least 72V can be placed across the input termi nals in order to get an accurate input voltage measurement 3 Turn on the power at the input NOTE Make sure that the input voltage never ex ceeds 72V 4 Check for the proper output voltage of 5 0V 5 Turn off the power at the input 6 Once th...

Page 3: ...QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1031A C 36V 72VIN SYNCHRONOUS FORWARD CONVERTER 3 Figure1 Proper Measurement Equipment Setup Figure2 Measuring Input or Output Ripple ...

Page 4: ... DATA Figures 3 through 11 are measured data for a typical DC1031A C Figures 12 through 21 are schematics bill of mate rials and layout Figure3 Efficiency 200lfm airflow Figure4 Output Ripple Voltage 72Vin 20Aout 50mV div 1us div 86 88 90 92 94 6 8 10 12 14 16 18 20 LOAD CURRENT A EFFICIENCY 36V 48V 72V ...

Page 5: ...QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1031A C 36V 72VIN SYNCHRONOUS FORWARD CONVERTER 5 Figure5 Output Voltage Transient Response 48Vin 10A to 20A step Vout 200mV DIV Iout 10A div 20us DIV ...

Page 6: ...NSTRATION CIRCUIT 1031A C 36V 72VIN SYNCHRONOUS FORWARD CONVERTER 6 Figure6 Temp Data 48Vin 20A 25 C 200LFM airflow front Figure7 Temp Data 48Vin 20A 25 C 200LFM airflow back Figure8 Temp Data 36Vin 20A 25 C 200LFM airflow front ...

Page 7: ...STRATION CIRCUIT 1031A C 36V 72VIN SYNCHRONOUS FORWARD CONVERTER 7 Figure9 Temp Data 36Vin 20A 25 C 200LFM airflow back Figure10 Temp Data 72Vin 20A 25 C 200LFM airflow front Figure11 Temp Data 72Vin 20A 25 C 200LFM airflow back ...

Page 8: ...2 Pulse PA0297 2 1 4mH 1 1 C3 C4 C5 100V 3x1 0uF C77 2 2uF 36 72Vin VOUT 100 R55 Q27 FCX491 Si7336ADP Q14 3 01K Si7336ADP Q12 D29 1N4148W R76 1K 1 4W C72 0 1uF 5 0V 20A VIN C55 470pF VOUT C78 33nF LINEAR TECHNOLOGY HAS MADE A BEST EF FORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER SUPPLIED SPECIFICATIONS HOWEVER IT REMAINS THE CUSTOMER S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE A...

Page 9: ... SUBSTITUTION AND PRINTED CIRUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE CUSTOMER NOTICE R41 R52 opt 1 4W R51 2 4 1 4W D25 LTC3725EMSE U1 3 8 9 10 7 2 4 5 1 6 11 NDRV VCC VSLMT IS GATE SSFLT FB IN FS IN ULVO PGND GND 1 5nF VSW R48 1W C81 10pF Vout Iout C79 2 2nF E7 910 R89 Q11 opt 4 5 2 3 6 7 8 1 100...

Page 10: ...OD 123 DIODES INC 1N4148W 7 F 20 1 L1 INDUCTOR 1 0uH VISHAY DALE IHLP2525CZER1R0M01 0 L1 second source INDUCTOR 1 0uH COOPER HCP0703 1R0 R 21 1 L2 INDUCTOR 0 87uH COOPER HC1 R87 22 1 Q8 FET N CH Si7450DP POWERPAK SO 8 VISHAY Si7450DP 23 2 Q12 Q14 FET N CH Si7336ADP POWERPAK SO 8 VISHAY Si7336ADP 24 1 Q34 N CH Transistor 2N7002 SOT23 DIODES INC 2N7002 7 F 25 1 Q27 NPN TRANSISTOR FCX491 ZETEX FCX491...

Page 11: ...sistor FMMT718 SOT23 7 5 R49 R83 R84 R87 R88 RES CHIP 0 1 16W 0603 Panasonic ERJ3GEY0R00V 8 0 R52 opt RES CHIP 1206 9 0 R53 R56 R75 opt RES CHIP 0603 11 1 R77 RES CHIP 0 1 8W 0805 AAC CJ10 000M 12 0 R86 opt RES CHIP 0805 HARDWARE FOR DEMO BOARD ONLY 1 2 E1 E2 TESTPOINT TURRET 094 MILL MAX 2501 2 2 2 E3 E4 STUD PEM KFH 032 10 3 4 E3 E4 2 EACH NUT BRASS 10 32 ANY 4 2 E3 E4 Ring Lug Ring 10 KEYSTONE ...

Page 12: ...QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1031A C 36V 72VIN SYNCHRONOUS FORWARD CONVERTER 12 Figure15 Top ...

Page 13: ...QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1031A C 36V 72VIN SYNCHRONOUS FORWARD CONVERTER 13 Figure16 Layer 2 ...

Page 14: ...QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1031A C 36V 72VIN SYNCHRONOUS FORWARD CONVERTER 14 Figure17 Layer 3 ...

Page 15: ...QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1031A C 36V 72VIN SYNCHRONOUS FORWARD CONVERTER 15 Figure18 Layer 4 ...

Page 16: ...QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1031A C 36V 72VIN SYNCHRONOUS FORWARD CONVERTER 16 Figure19 Layer 5 ...

Page 17: ...QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1031A C 36V 72VIN SYNCHRONOUS FORWARD CONVERTER 17 Figure20 Bottom ...

Page 18: ...QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1031A C 36V 72VIN SYNCHRONOUS FORWARD CONVERTER 18 Figure21 Bottom Mirrored ...

Page 19: ...Mouser Electronics Authorized Distributor Click to View Pricing Inventory Delivery Lifecycle Information Analog Devices Inc DC1031A C ...

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