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 C3 1uF 1 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 16 VIN 15 3 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 R6 opt. C7 220pF L4 10uH D10 BAT760 C9 R20 100pF 100K 910 R24 22K C8 100pF VU1 CU1 4.7uF 5 3 4 C11 4.7nF C23 1uF VFB 16V U6 PS2801-1 4 1 3 2 R33 158K PMEG3002AEB VR2 R32 B D17 BAS516 R53 200 OPTIONAL FOOTPRINT FOR T1 SW0 SW0 +VIN C33 0.1uF SW1 2 6 7 A1 4 1 PA2720NL R54 2.2 1206 C25 33nF 200V 1206 R45 10K C28 opt. A SOUT R48 opt. VU1 U7 opt. 1 VCC BOOST 6 2 GND TG 5 3 INP TS 4 C30 opt. 4 2 CS- TIMER 7 3 CG GND 6 4 VCC FG 5 C12 470pF R52 0 VCC OPTO 6 2 GND COMP 5 3 OC 4 FB C17 15nF R35 82.5K R34 8.66K C18 opt. C24 R38 18.2K 39pF FG +VO1 B ** FOR ASSEMBLY +VIN 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 56K -A THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 8 VERSIONS * D14 BAS516 C29 opt. CS+ SYNC CG 1 C19 1uF 4 OPTIONAL CIRCUIT 1 R51 0 U4 LT4430ES6 C16 0.22uF C SYNC C14 1uF 0.33uF 100V 1210 1 2 3 5 R18 10K R27 470 R31 10 -VOUT VAUX U5 LTC3900CS8 R21 10K D11 BAS516 C34 Q13 Si7309DN SW2 8 9 10 SW1 R16 33K D9 PDZ7.5B R17 560 C15 2200pF 250V 1812 R2 560K 196K OPT C5 0.22uF 50V C6 opt. VAUX TP5 R10 1K 5 6 7 8 115K R30 1.2K D VAUX VAUX R26 220 ** CSYS 470uF 6.3V T530X477M006ATE004 1 Q9 BCX55 B0540W D8 opt. SYNC +VB R28 4 2 VU1 C13 0.47uF 10V R29 6 2 +VO1 opt. L3 1 + TP6 R12 0 ohm T2 PE-68386 PULSE ENG. SOUT D15 opt. D7 opt. RCS1 0.005 KOA, TLR2H CO1 CO2 CO3 opt. 100uF 6.3V TDK 1812 opt. D6 +VOUT TP4 1.2uH PAYTON 54289 Q3 HAT2165 C4 0805 R9 47 R3 249 R23 opt. TP3 +VO1 L1 CG Q2 HAT2165 R8 2.2 470pF opt. D16 opt. R7 0 OUT SOUT R50 Q1 Si7138DP 4 SW1 opt. C32 5 VCCBOOST C31 FG SW0 U2 LTC4440ES6-5 C 10 11 2 R5 0 100V R49 +VIN -VIN C35 opt. 1206 opt. SW2 TP2 VU1 C1 R4 R55 1 7 8 1 D5 PDZ10B 2 T1 G45R2-0302.007 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 10/8/07 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 Thursday, June 11, 2009 * * * ISOLATED FORWARD DC/DC CONVERTER 10/8/07 APPROVED +VOUT 3.3V @ 30A FILENAME: DWG NO REV DC1317A-F SHEET 1 1 A OF 1