5 4 3 2 R23 L5 T3 CT02-100 R49 C69 *100V 123 R3 1nF 1uF R63 100K 2 CMPSH1-4 B B C84 R80 0.1uF 100K 3 6 D R79 68K 1 BAS21 3 R78 10pF T4 3 B D1 4 5.0V@40A DC888A-C 12V@20A FB 6 VCC R62 VCC 24 NDRV 18 1 VIN 19 MODE 4 OPT 7 R46 604 J1-7 +ITH C77 2.2uF 7 P1-7 * 8 R71 J1-8 OPT R72 P1-8 8 J1-9 9 OPT * 36V R74 R107 * C30 -VIN R82 -VOUT 2.2nF 250V +VOUT SG 150 C86 68pF 150 Q31 MMBT2907A R56 R102 100 * C31,C68 C33 220uF, 4V 220uF, 6.3V 68uF, 16V opt SYNC P1-9 10 J1-10 OPT Vaux -ITH 9 R73 10 SSS P1-10 B 11 R81 D2 CMPSH1-4 R108 6 * VERSION TABLE DC888A-B C C79 J1-11 -VOUT 11 Q32 FMMT619 3 4 Vsg P1-3 3 P1-4 4 J1-3 -VOUT P1-11 J1-4 Q26 FMMT718 -VOUT -VOUT Vout/Iout R60 OPT * * 3.3V@50A C74 OPT D31 -VOUT 100uH CMPSH1-4 D DC888A-A VS+ 10 OPT R68 R69 R70 0 110K R59 OPT * L1 DA2318-ALC VERSION * VS- 11 VCC C 1 R64 R67 * +VPKS P1-6 C75 T4 connection for A-A A J1-6 6 OPT C85 0.1uF -VPKS J1-5 6 1 Q30 2N7002 * VCC -VOUT D30 5 R41 C83 3 D24 1 D29 5 VCC 3 opt. C78 10nF 2 4 Q29 Si2303BDS 1 A C 3 Q27 VSOUT C82 opt. FS/IN- 5 E4 - 9 21 PT- U2 LTC3706EGN PHASE 1 22 PT+ * C70 5 1uF SW T4 TO CONFIGURE FOR POLYPHASE -Vout FCX491A SG 1 C71 D * SG FS/SYNC 3 IS+ REGSD R101 100 VCC 13 GND opt. 4 6 2 IS+ 16 IS 10 C81 C100 C101 150pF 470pF -VOUT R53 12 R66 100K T4 connection for A-B & A-C * P1-5 17 C29 10nF FB/IN+ 4 PGND C24 * 8 * + C68 E8 T2 5 0.1uF 11 C55 GATE 7 NDRV 3 2 SSFLT R22 15.0K 6 2 P1-2 VSLMT J1-2 9 SSP * + C31 C67 10uF 25V 4 1/4W -VOUT 5.1K C72 LTC3725EMSE * ITH * U1 1 ULVO 2 + C33 +Vout D26 CMPSH1-4 12 6 5 2 1 4 P1-1 C 8 VCC R18 365K C34 321 Q25 R52 1/4W R58 3 1 Vaux 7 * R29 100K 1 E3 FMMT718 R51 J1-1 E7 -VOUT C27 -VIN * + +VOUT 1 2 Vsg 4 R48 1.5W 100pF Q28 FDC2512 8765 SW 321 100 TO CONFIGURE FOR POLYPHASE Q12 Q13 Q23 R75 510 8765 C66 *200V 4 0 11 * SLP -VIN 5 6 5678 Q14 Q15 Q24 14 E2 * R76 B 10 8 * 4 5 IS- 15 -Vin 4 3 L6 1/4W -VOUT RUN/SS IS+ * Q8 Q9 Q11 Si7450DP -VOUT * PGOOD * R84 7 3 C5 2.2uF 100V C51 *100V A * 8 C4 2.2uF 100V T1 1 2 FG 2 D C3 2.2uF 100V 3 SW 20 C2 2.2uF 100V D27 BAS21 4 1/4W *R24 GND 36V-72Vin 2 PGND 1 0.68uH E1 23 +Vin 1 C34 C66 C51,C69 C70 C75 C79 D30 D31 L6 Q8 22uF 1.5nF 4.7nF 3.3nF 47pF 4.7nF opt. opt. PA1382.650 opt. 22uF 1.5nF 2.2nF 3.3nF 100pF 3.3nF opt. opt. 10uF 680pF 1.0nF 10nF 470pF 4.7nF BAS21 MMBZ5258B PA1382.650 PA1494.242 Si7450DP Si7450DP Q12-Q15 R41 R48 R68 R76 R78 R84 R102 R107 R108 T1 2.74K 0.015 9.1K 9.53 2.2K opt. opt. 0 PA0950(6:6:1:1) 6.8 4.42K 0.015 9.1K 8.06 620 750 1.0K 0.010 6.2K 7.50 390 330 opt. 0 PA0954(4:4:1:1) 11.5K opt. 240 0 10 opt. PA0955(6:6:2:1) Q23,Q24 R23,R24,R51,R52 Si7336ADP 5.1 Si7336ADP HAT2244WP opt. A A NOTE: C2-C5 2.2uF,100V Murata GRM32ER72A225K L5 VISHAY IHLP2525CZERR68M01 T2 Pulse PA1954NL CUSTOMER NOTICE CONTRACT NO. LINEAR TECHNOLOGY 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 CIRUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 4 3 2 APPROVALS DRAWN J. WU DATE 10/16/06 CHECKED TECHNOLOGY TITLE LTC3725EMSE, LTC3706EGN, 36V - 72Vin Forward Converter APPROVED ENGINEER 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 R. Huff 10/16/06 DESIGNER Thursday, August 30, 2007 SIZE CAGE CODE SCALE: DWG NO REV A DC888A FILENAME: SHEET 1 1 OF 1