4 +VIN ** CIN1 CIN2 CIN3 2.2uF 100V TDK 1812 D 6 5 2 1 L2 1.5mH DO1607B-155ML-C VU1 4 A1 D2 BAS516 VR2 R11 82K D3 BAS516 6 VU1 1 2 3 VCCBOOST GND 2 TG INP TS C21 VFB 3 opt. R13 22K R14 33K R15 169K R42 0 C10 0.1uF R22 13.3K 1 COMP 2 FB=1.23V SOUT 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 4 470pF C7 220pF OUT L4 10uH T2 PE-68386 PULSE ENG. SOUT D10 100pF C9 R20 100pF 75K R23 1.5K R24 47K C8 100pF VU1 CU1 4.7uF 1 6 2 5 VR2 R32 B C11 3.3nF 3 4 16V U6 PS2801-1 4 1 3 2 R30 1.2K D17 BAS516 R53 200 SW0 SW0 +VIN C33 0.1uF SW1 2 6 7 4 1 SW2 R54 4.7 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. R27 470 4 1 CS+ SYNC 8 2 CS- TIMER 7 3 CG GND 6 4 VCC FG 5 VCC OPTO 6 2 GND COMP 5 3 OC 4 FB C17 15nF C12 470pF FG R35 +VO1 237K 1% R34 13.7K 1% C18 opt. B C24 R38 6.04K 1% ** opt. FOR ASSEMBLY +VIN +VOUT -A 34V - 75V 3.3V @ 30A -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 R52 0 CG 1 C SYNC VERSIONS THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 -VOUT VAUX U5 LTC3900CS8 R51 0 U4 LT4430ES6 C16 OPT. * D14 BAS516 C29 opt. C14 10uF 10V C19 1uF 4 OPTIONAL CIRCUIT PA2720NL R21 10K 0.22uF 200V 1210 1 2 3 5 SW1 R16 221K 0805 D9 PDZ10B R17 560 C34 Q13 Si2325 8 9 10 C5 0.22uF 50V R31 0 TP5 R10 4.7K R18 10K C15 2200pF 250V 1812 R2 560K OPTIONAL FOOTPRINT FOR T1 A1 L3 BAS521 D11 BAS516 VAUX D 1 Q9 BCX55 VAUX R26 220 C23 1uF VFB 187K D8 opt. ** VAUX 5 6 7 8 309K 4 2 VU1 R33 opt. PMEG3002AEB +VO1 0 D6 B0540W7 opt. CSYS 270uF 25V 25HVH270M + TP6 R12 C6 BAS521 SYNC +VB R28 C4 D7 330pF RCS1 0.006 KOA, TLR2H R6 OPT D15 opt. 0805 R9 47 CO1 CO2 opt. CO3 opt. 22uF 25V TDK 1812 opt. Q2 HAT2173 D16 opt. +VOUT TP4 27uH HR-PQA2050-27-LTC CG TP3 +VO1 L1 Q3 RJK2055 opt. R8 2.2 R7 0 C13 0.47uF 10V R29 R50 Q1 HAT2173 R3 287 D1 BAS516 U1 LT1952EGN-1 5 C31 opt. opt. C32 5 6 SW1 R49 FG SW0 C3 1uF Q12 BC856T 1 opt. 10 11 2 R5 10 U2 LTC4440ES6-5 C C1 +VIN -VIN C35 R4 R55 SW2 TP2 1 7 8 1 D5 PDZ10B 2 T1 G45R2-0408-004 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 2 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 A LT1952EGN-1, LT4430ES6 CHECKED Thursday, November 19, 2009 48V @ 1.5A ISOLATED FORWARD DC/DC CONVERTER 10/8/07 APPROVED * * * CAGE CODE SCALE: FILENAME: DWG NO REV DC1317A-D SHEET 1 1 A OF 1