5 4 +VIN +VIN CIN1 CIN2 CIN3 2.2uF 100V TDK 1812 D 6 5 2 1 4 D3 BAS516 6 SW1 10 11 C3 1uF 16V 1 2 3 VCCBOOST GND TG INP TS C21 6 5 R50 C31 CG R8 2.2 220pF R14 33K R15 115K R42 0 C10 0.1uF R22 13.3K R29 +VB 1 COMP 2 FB=1.23V VR2 15 ROSC OUT 14 4 SYNC PGND 13 5 SS/MAXDC DELAY 12 6 VR=2.5V OC 11 ISENSE 10 BLANK 9 7 SD/VSEC 8 GND D10 100pF C9 R20 100pF 115K R23 2K R24 68K CU1 4.7uF 16V 1206 C11 OPT 5 6 2 5 3 4 D17 BAS516 SW0 R54 C25 10nF 200V 1206 1 3 2 VAUX R31 10 C15 2200pF 250V 1812 3 CS- TIMER 7 3 CG GND 6 4 VCC FG 5 6 GND COMP 5 OC 4 FB C17 15nF C18 OPT R19 47.5K 1% C12 470pF R52 0 FG R35 +VO1 348K 1% R34 12.1K 1% C24 22pF B ** R38 18.2K 1% FOR ASSEMBLY VERSIONS +VIN -A 34V - 75V 3.3V @ 30A +VOUT 5V @ 25A 18V - 72V 12V @ 8A -D 18V - 72V 24V @ 4A R45 10K 1. ALL RESISTORS ARE 0603. ALL CAPACITORS ARE 0603. -E 36V - 72V 9V - 36V 3.3V @ 20A (5V @ 15A) D14 BAS516 * -F -G 9V - 36V 12V @ 5A (18V @ 4A) NOTES: UNLESS OTHERWISE SPECIFIED SEE QUICK START GUIDE. -H 1 VCC BOOST 6 2 GND TG 5 INP TS 4 C30 opt. C29 opt. CUSTOMER NOTICE 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 CIRCUIT 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 2 CG VCC OPTO C19 1uF 10V 0805 0.22uF 200V 1210 8 R51 0 U4 LT4430ES6 10V 1 C16 0.22uF 2 CS+ SYNC 9V - 36V 5V @ 12A * * * 48V @ 1.5A U7 opt. 3 SOUT R27 470 1 18V - 72V SW2 R48 opt. C14 1uF 10V 0805 C SYNC -B 4 A R18 10K R21 10K D11 BAS516 VAUX U5 LTC3900CS8 -C Q13 Si2325 C28 opt. SW1 R16 33K 0805 D9 PDZ10B R17 560 C34 4.7 1206 SW1 VU1 R10 1K C5 C6 0.22uF BAS521 50V 0805 SYNC U6 PS2801-1 4 R2 560K PA2720NL D8 opt. 16V R33 opt. OPTIONAL CIRCUIT 1 Q9 BCX55 VAUX 1 2 3 8 9 10 VAUX 4 2 L3 680uH 1 R30 1.2K 6 7 -VOUT opt. D6 opt. opt. T2 PE-68386 PULSE ENG. R26 220 C23 1uF R53 10uH TP6 VU1 VFB SW0 +VIN 4 1 C8 100pF VU1 C33 0.1uF A1 L4 10uH SOUT OPTIONAL FOOTPRINT FOR T1 2 C7 220pF OUT C13 0.47uF 10V R28 R32 187K 16 VIN 3 PMEG3002AEB 309K SOUT R6 OPT TP5 +VO1 D7 BAS521 RCS1 0.006 KOA, TLR2H 16V APXE R12 0805 R9 0 R3 442 D1 BAS516 U1 LT1952EGN-1 C4 D + 220uF D15 opt. Q2 HAT2266 opt. ** CSYS CO1 33uF CO2 opt. CO3 opt. 16V opt. 5 6 7 8 R13 22K 10uH HR-PQA2050-10 D16 opt. R7 0 4 TP4 Q3 HAT2173 Q1 HAT2173 VFB 2 opt. opt. C32 SW0 U2 LTC4440ES6-5 3 R49 FG 2 R5 10 +VO1 L1 +VOUT 5 B TP3 3 VU1 Q12 BC856T 1 100V +VIN -VIN C C35 SW2 TP2 1 7 8 1 D5 PDZ10B C1 opt. 1206 opt. T1 G45R2-0405-005 CHAMPS TECH A1 D2 BAS516 VR2 R11 47K 2 R4 R55 L2 1.5mH DO1607B-155ML-C VU1 3 ** +VB R1 2.2 TP1 3 Q10 PBSS8110D 4 3 CONTRACT NO. APPROVALS DRAWN J. Wu DATE 10/8/07 TECHNOLOGY TITLE ISOLATED FORWARD DC/DC CONVERTER 10/8/07 CHECKED SIZE CAGE CODE APPROVED Wednesday, February 25, 2009 2 A LT1952EGN-1, LT4430ES6 ENGINEER G. Perica 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 SCALE: FILENAME: DWG NO REV DC1317A-C SHEET 1 1 A OF 1