4 +VB R1 2.2 +VIN ** CIN1 CIN2 opt. CIN3 2.2uF 100V TDK 1812 D 6 5 2 1 VU1 4 A1 D2 BAS516 1 D5 PDZ10B D3 BAS516 -VIN 2 3 VCC BOOST 6 GND 5 TG INP R50 C21 R9 0 3.3 Q12 BC856T 1 R13 22K R14 33K R15 143K R42 0 C10 0.1uF R22 13.3K R29 22K 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 D10 opt. C8 opt. CU1 4.7uF 16V C9 R20 100pF 340K R23 1K R24 10K R28 442K VR2 R32 C11 opt. C33 0.1uF T1 FOOTPRINT SW1 SW2 OPTIONAL CIRCUIT VU1 8 9 10 5 3 4 PA2720NL C28 opt. A U7 1 VCC BOOST 6 2 GND TG 5 INP TS 4 3 opt. SOUT R48 opt. C30 opt. C29 opt. 4 TP6 VAUX 4 2 1 Q9 0 ohm D8 opt. R10 opt. C5 opt. 50V 0805 C6 opt. 50V 0805 SYNC SW1 R16 opt. D9 opt. VAUX U6 PS2801-1 R21 opt. 4 1 3 2 D11 BAS516 C14 opt. R27 270 D17 BAS516 VAUX R31 0 C15 2200pF 250V 1812 R54 C34 opt opt 3 1206 1 CS+ SYNC 8 2 CS- TIMER 7 3 CG GND 6 4 VCC FG 5 6 GND COMP 5 OC 4 FB C17 0.01uF C18 opt. R19 opt. C12 opt. R52 opt. CG VCC OPTO C19 0.33uF 10V 0805 33nF C25 200V SYNC R51 opt. U4 LT4430ES6 10V 1 C16 0.22uF 2 C U5 opt. R18 opt. R17 opt. FG R35 +VO1 137K 1% 0805 R34 5.36K 1% C24 47pF B ** R38 18.2K 1% FOR ASSEMBLY VERSIONS +VIN +VOUT -A 34V - 75V 3.3V @ 30A -B 18V - 72V 5V @ 25A -C 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 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 opt. D6 1N4148W C4 0 ohm VAUX 1 2 3 6 7 4 1 5 Q13 Si2325DS 4 SW0 +VIN A1 2 R30 1.2K R53 200 TP5 -VOUT 16V C13 0.47uF 10V SW0 2 1 T2 opt. PULSE ENG. 6 R26 220 C23 1uF VFB 332K D +VO1 VU1 R2 opt. ** CSYS 470uF 6.3V R12 L3 opt. L4 opt. SOUT VU1 D15 opt. + 0805 C7 opt. OUT 3 7 R6 0 R33 158K +VB B U1 LT1952EGN-1 R3 opt. Q3 FDMC8854 Q2 FDMC8854 D7 opt. RCS1 0.025 1206 opt. CO1 CO2 opt. 100uF 6.3V TDK 1812 CO3 opt. 1206 5 6 7 8 3 2 C D1 opt. C31 opt. R8 100 R7 opt. VFB 3.1uH CG 0 D16 opt. Q1 Si7818DN 4 TS R49 opt. C32 4 5 1 TP4 FG SW0 C3 opt. +VO1 L1 +VOUT 3 2 R5 opt. TP3 SW1 9 10 11 +VIN U2 opt. 100V T1 opt. 7 8 6 1 C35 SW2 TP2 VU1 C1 opt. 1206 opt. VR2 R11 82K 2 R4 R55 L2 1.5mH DO1607B-155ML-C 3 +VIN TP1 3 Q10 PBSS8110D 3 5 3 9V - 36V CONTRACT NO. APPROVALS DRAWN J. Wu DATE 10/8/07 TECHNOLOGY TITLE CHECKED SIZE CAGE CODE APPROVED 2 48V @ 1.5A 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 A ISOLATED FORWARD DC/DC CONVERTER 10/8/07 Wednesday, February 25, 2009 * * * LT1952EGN-1, LT4430ES6 ENGINEER G. Perica 5V @ 12A SCALE: FILENAME: DWG NO REV DC1317A-E SHEET 1 1 A OF 1