4 +VIN +VB R1 2.2 TP1 +VIN D 4 D3 BAS516 6 3 2 R5 opt. 1 C3 opt. 6 2 GND TG 5 3 INP TS 4 C21 0805 R9 0 D1 opt. 2 3 Q12 BC856T 1 R13 22K R14 33K R15 115K R42 0 C10 0.1uF R22 13.3K 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 C7 opt. SOUT C8 opt. VU1 D10 BAT760 CU1 4.7uF 16V 1206 C9 R20 100pF 174K R23 1.2K R24 39K C11 OPT SW1 C5 opt. 0805 R21 opt. VAUX C14 opt. 0805 U6 PS2801-1 4 1 3 2 D11 BAS516 R31 0 C15 2200pF 250V 1812 C34 R54 4.7 C25 10nF 200V 1206 VAUX R27 470 VU1 1 CS+ SYNC 8 2 CS- TIMER 7 3 CG GND 6 4 VCC FG 5 A U7 1 VCC BOOST 6 2 GND TG 5 INP TS LTC4440ES6 opt. 4 3 SOUT R48 opt. C30 opt. C29 opt. 4 R52 opt. FG U4 LT4430ES6 10V 1 C16 0.22uF 2 3 VCC OPTO 6 GND COMP 5 OC 4 FB C17 0.01uF R35 +VO1 82.5K 1% 0805 R34 4.75K 1% C18 OPT 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 1. ALL RESISTORS ARE 0603. ALL CAPACITORS ARE 0603. -E 36V - 72V * -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. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 C C12 opt. R51 opt. -H C28 opt. R19 opt. opt. NOTES: UNLESS OTHERWISE SPECIFIED D14 BAS516 PA2720NL SYNC CG C19 1uF 10V 0805 0.22uF 200V 1210 R45 10K OPTIONAL CIRCUIT VAUX U5 LTC3900CS8 R18 opt. D9 opt. R17 opt. 1 2 3 5 SYNC 4 SW2 8 9 10 SW1 R16 opt. 0805 Q13 Si2325 6 7 4 1 D17 BAS516 SW0 C33 0.1uF C6 opt. 0805 4 R2 opt. SW0 +VIN A1 5 R30 1.2K OPTIONAL FOOTPRINT FOR T1 R10 opt. 16V C13 0.47uF 10V R53 200 2 6 2 R26 220 C23 1uF VFB 332K D8 opt. 5 6 7 8 R32 B TP6 CO3: SEE QUICK START GUIDE (INSTALL 330 OHMS RESISTOR IN PLACE OF CO3) 1 Q9 0 ohm VU1 R33 470K VR2 1 3 R28 442K VAUX 4 2 0805 T2 opt. PULSE ENG. TP5 -VOUT opt. D6 B0540W L3 OPT L4 opt. OUT SOUT 6.3V APXE 0805 R6 0 U1 LT1952EGN-1 R29 22K +VB R3 opt. D CSYS + 470uF +VO1 D7 opt. RCS1 0.015 1206 opt. VFB ** CO1 CO2 100uF 6.3V TDK 1812 CO3 opt. 1206 R12 C4 0 ohm R8 2.2 +VOUT D15 opt. D16 opt. Q1 Si7430DP TP4 Q3 HAT2165 Q2 HAT2165 2.2 +VO1 opt. C31 0805 R7 opt. CG 2.2 0805 opt. R50 4 5 VCCBOOST R49 FG C32 SW0 U2 opt. C 9 10 11 +VIN -VIN TP3 L1 0.65uH PA1671.650 2 5 1 4 3 SW1 SW2 TP2 VU1 100V 7 8 1 1 C35 T1 PA0861.004 A1 D2 BAS516 D5 PDZ10B C1 opt. 1206 opt. VR2 R11 82K 2 R4 R55 L2 1.5mH DO1607B-155ML-C VU1 3 ** CIN1 CIN2 CIN3 2.2uF 100V TDK 1812 6 5 2 1 3 Q10 PBSS8110D 3 5 3 9V - 36V CONTRACT NO. APPROVALS DRAWN J. Wu DATE 10/8/07 TECHNOLOGY TITLE 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 CHECKED SIZE CAGE CODE APPROVED Wednesday, December 10, 2008SCALE: 2 * * LT1952EGN-1, LT4430ES6 ENGINEER G. Perica 5V @ 12A FILENAME: DWG NO REV DC1317A-A SHEET 1 1 A OF 1