4 Q10 PZTA42 VU1 3 L2 1.5mH DO1607B-155ML-C VR2 1 2 GND TG 5 R42 0 3 ROSC 4 SYNC SOUT 16 VIN 15 OUT 14 PGND 13 1 C9 R20 100pF 59K 5 SS/MAXDC DELAY 12 6 VR=2.5V OC 11 7 SD/VSEC ISENSE 10 C10 0.1uF R22 13.3K 8 GND VR2 R32 442K R29 22K 2 D10 BAT760 BLANK 9 R23 2K R24 82K C7 220pF C8 100pF VU1 CU1 4.7uF 16V 1206 6 2 5 3 4 C11 2200pF R26 220 C23 1uF 16V SW0 VU1 1 3 2 1 R47 10K 1 2 3 4 5 6 7 8 C6 C5 BAS521 0.22uF 50V 0805 0805 SW1 R16 47K 0805 D9 PDZ7.5B 2 1 R18 10K C27 0.1uF C28 0.1uF C30 100pF R48 150 U7 1 VCC BOOST 6 2 GND TG 5 3 INP TS 4 R45 10K C29 0.1uF 2 R31 10 C15 2200pF 250V 1812 C12 470pF FG GND 6 FG 5 C14 1uF 10V 0805 R27 270 U4 LT4430ES6 10V 1 VCC OPTO 6 C16 0.22uF 2 GND COMP 5 3 OC R19 38.3K 1% 2 CS- TIMER 7 3 CG C SYNC 1 CS+ SYNC 8 R21 10K FB 4 C19 1uF 10V 0805 C17 R34 3300pF 8.45K 1% C18 10pF R35 +VO1 348K 1% 0805 C24 10pF B R38 18.2K 1% D14 BAS516 1 NOTES: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS ARE IN OHMS, 0603. ALL CAPACITORS ARE IN MICROFARADS, 0603. LTC4440ES6 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 CIRUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. 3 VERSIONS -A VIN 34V-75V VOUT 3.3V@30A 5V@20A -B 18V-36V -C 36V-72V 12V@12A -D 36V-72V 28V@4A CONTRACT NO. APPROVALS DRAWN: TECHNOLOGY KIM T. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 LTC Confidential-For Customer Use Only TITLE: CHECKED: APPROVED: ENGINEER: GORAN P. DESIGNER: ISOLATED DC/DC POWER CONVERTER SIZE A THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 4 VAUX U5 LTC3900CS8 * FOR ASSEMBLY 1 2 3 C26 220pF D13 PDZ5.1B A 5 R10 1K 4 2 OUT R46 OPT VAUX -VOUT 1 Q9 BCX55 Q13 IRF6217 R44 11.3K U3 74VHC123AMTC A1 VCC 16 B1 RC1 15 R1 C1 14 -Q1 Q1 13 Q2 -Q2 12 R2 11 C2 RC2 B2 10 GND A2 9 L3 680uH D11 BAS516 1 2 C25 OPT 1206 TP5 4 VCC U6 PS2801-1 4 R30 1.2K R43 OPT D8 OPT D VAUX 4 2 1 R17 560 5 6 7 8 +5V SYNC 16V APXE VAUX B D12 BAS516 2 1 0805 2 T2 PE-68386 PULSE ENG. 1 * CSYS CG VFB OPTIONAL CIRCUIT 0805 D7 BAS521 D6 OPT VU1 R33 158K +VB R28 442K C4 OPT +VOUT + 150uF TP6 DO1608C-684ML-C R6 OPT C13 1uF CO1 CO2 OPT CO3 OPT 33uF 16V 1812 1 R3 57.6 1% OUT TP4 Q3 HAT2244 R8 2.2 RCS1 0.010 2010 220pF +VO1 CG Q2 HAT2244 C2 820pF 200V 1206 1 R15 133K 1 COMP 2 FB=1.23V 3 2 R9 47 2 2 3 R14 33K D1 BAS516 FG 4 5 Q1 PHM21NQ15T R7 0 TS 4 C21 R13 22K Q12 BC856T 1 +VIN 9 10 11 2 1 VCCBOOST 6 3 INP U1 LT1952EGN-1 SW1 7 8 3 U2 LTC4440ES6-5 C 6 SW0 C3 1uF 16V L1 3uH PA1393.302 2 5 1 4 3 1 D3 BAS516 R5 10 VFB 1 1 VU1 D2 BAS516 2 1 TP3 T1 PA0423 2 D5 PDZ10B 2 -VIN R11 82K CIN1 CIN2 CIN3 2.2uF 100V TDK 1812 TP2 4 2 2 1 * D +VB R1 2.2 2 +VIN 1 1 +VIN TP1 3 2 5 DATE: 2 DWG NO. DC968A2-C REV LT1952EGN-1, LTC3900CS8, LT4430ES6 Wednesday, January 21, 2009 SHEET 1 1 A2-C OF 1 A