4 +VIN ** CIN1 CIN2 CIN3 6.8uF 50V 1812 D 6 5 2 1 VU1 4 L2 1.5mH DO1607B-155ML-C A1 D2 BAS516 VR2 R11 10K D3 BAS516 6 -VIN 1 C3 1uF 16V 2 3 6 GND 5 INP 2 3 TS C21 VFB Q12 BC856T 1 TG R13 22K R14 33K R15 178K R42 0 C10 0.1uF R22 13.3K D1 BAS516 U1 LT1952EGN-1 1 COMP 2 FB=1.23V SOUT 16 VIN 15 ROSC OUT 14 4 SYNC PGND 13 5 SS/MAXDC DELAY 12 6 VR=2.5V OC 11 ISENSE 10 BLANK 9 SD/VSEC 8 GND R8 2.2 R3 665 R6 opt. C7 220pF L4 10uH SOUT D10 100pF R20 100K R23 910 R24 100K C8 100pF VU1 CU1 4.7uF 6 2 5 3 4 C11 100pF R26 220 C23 1uF VFB 16V U6 PS2801-1 4 1 3 2 R32 196K B VR2 R53 10uH D17 BAS516 SW0 C33 0.1uF SW1 2 VAUX 5 C25 33nF 200V 1206 R45 10K OPTIONAL CIRCUIT PA2720NL C28 opt. A SOUT R48 opt. VU1 U7 opt. 1 VCC BOOST 6 2 GND TG 5 3 INP TS 4 C30 opt. 4 CS+ SYNC 8 2 CS- TIMER 7 3 CG GND 6 4 VCC FG 5 C12 470pF R52 0 CG 1 VCC OPTO 6 2 GND COMP 5 3 OC 4 FB C17 15nF R35 348K R34 12.1K C18 opt. C24 R38 18.2K OPT. FG +VO1 B ** FOR ASSEMBLY +VIN -A 34V - 75V -B 18V - 72V 5V @ 25A -C 18V - 72V 12V @ 8A NOTES: UNLESS OTHERWISE SPECIFIED -D 18V - 72V 24V @ 4A 1. ALL RESISTORS ARE 0603. ALL CAPACITORS ARE 0603. -E 36V - 72V 5V @ 12A -F 9V - 36V 3.3V @ 20A (5V @ 15A) -G 9V - 36V 12V @ 5A (18V @ 4A) SEE QUICK START GUIDE. 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. 3 R19 60.4K VERSIONS THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 1 R51 0 U4 LT4430ES6 C16 opt. * D14 BAS516 C29 opt. R27 470 R31 0 C SYNC C14 1uF C19 1uF 1 2 3 SW2 8 9 10 R18 10K 0.33uF 100V 1210 4 6 7 4 1 R54 2.2 1206 VAUX U5 LTC3900CS8 R21 10K D11 BAS516 C34 Q13 Si7309DN SW0 +VIN A1 SW1 R16 33K D9 PDZ10B R17 560 C15 2200pF 250V 1812 R2 560K OPTIONAL FOOTPRINT FOR T1 R10 1K 5 6 7 8 115K R30 1.2K R33 opt. PMEG3002AEB D8 opt. VAUX +VB R28 1 Q9 BCX55 opt. C5 0.22uF C6 50V BAS521 SYNC -VOUT VAUX VU1 C13 0.47uF 10V R29 4 2 L3 680uH 1 D TP5 +VO1 D6 T2 PE-68386 PULSE ENG. ** CSYS 220uF 16V APXE TP6 R12 opt. D7 BAS521 RCS1 0.005 KOA, TLR2H + D15 opt. C4 opt. R9 47 220pF C9 opt. opt. CO1 CO2 opt. CO3 opt. 33uF 16V 1812 Q3 HAT2173 Q2 HAT2266 +VOUT TP4 16uH HR-PQA2050-16-LTC CG TP3 +VO1 L1 opt. D16 opt. R7 0 OUT 3 7 R50 Q1 HAT2266 4 SW1 opt. C32 5 VCC BOOST opt. C31 FG SW0 U2 LTC4440ES6-5 100V R49 10 11 2 R5 0 C35 opt. 1206 opt. +VIN VU1 C1 SW2 TP2 C R4 R55 1 7 8 1 D5 PDZ10B 2 T1 G45R2-0306.006 CHAMPS TECH 3 +VIN +VB R1 2.2 TP1 3 Q10 PBSS8110D 3 5 -H 9V - 36V CONTRACT NO. APPROVALS DRAWN J. Wu ENGINEER G. Perica DATE 7/28/09 TECHNOLOGY TITLE SIZE CAGE CODE SCALE: 2 48V @ 1.5A 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 A LT1952EGN-1, LT4430ES6 CHECKED Wednesday, July 29, 2009 * * * ISOLATED FORWARD DC/DC CONVERTER 7/28/09 APPROVED +VOUT 3.3V @ 30A FILENAME: DWG NO REV DC1317A-G SHEET 1 1 A OF 1