4 Q10 PZTA42 VU1 3 L2 1.5mH DO1607B-155ML-S D3 BAS516 SW0 U2 LTC4440ES6-5 TS 4 R15 115K R42 0 1 COMP 2 FB=1.23V 3 ROSC 4 SYNC D1 BAS516 SOUT 16 VIN 15 1 0805 D7 OPT RCS1 0.010 2010 220pF C9 R20 100pF 43.2K 5 SS/MAXDC DELAY 12 6 VR=2.5V OC 11 7 SD/VSEC ISENSE 10 C10 0.1uF R22 13.3K 8 GND R29 22K 2 D10 BAT760 BLANK 9 R23 1.5K R24 82K R6 OPT C7 220pF C8 100pF VU1 CU1 4.7uF 16V 1206 6 2 5 3 4 16V 4 1 3 2 R30 1.2K B +5V VU1 R43 1K 1 R47 10K 1 2 3 4 5 6 7 8 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 VAUX 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 0.015uF 16.9K 1% C18 OPT R35 +VO1 280K 1% 0805 C24 OPT B R38 6.19K 1% D14 BAS516 1 VERSIONS -A 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. APPROVALS DRAWN: 3 VOUT 3.3V@30A 5V@20A -B 18V-36V 36V-72V 12V@12A -D 36V-72V 28V@4A TECHNOLOGY KIM T. VIN 34V-75V -C CONTRACT NO. 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 SW1 R16 56K 0805 D9 PDZ9.1B 2 1 4 2 OUT R46 2.2K 0805 C5 0.22uF 50V 0805 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 R10 0 L3 OPT D11 BAS516 1 2 SW0 C25 0.047uF, 200V 1206 -VOUT Q9 VAUX 0 OHM R17 560 5 6 7 8 D12 BAS516 2 1 TP5 4 VCC U6 PS2801-1 D 35V D8 BAS21H C6 0 0805 SYNC * CSYS VAUX R26 220 C23 1uF VFB OPTIONAL CIRCUIT 0805 T2 PE-68386 PULSE ENG. 1 +VOUT + 330uF TP6 D6 BAS21H 2 1 C4 680PF,100V TP4 CG C11 OPT C13 0.47uF 10V Q3 Si7846DP VU1 R33 158K +VB R28 442K R8 2.2 R9 47 R3 41.2 1% OUT OUT 14 PGND 13 Q2 HAT2174H C2 OPT 1206 1 R14 33K U1 LT1952EGN-1 3 2 +VO1 CO1 CO2 OPT CO3 OPT 6.8uF 50V TDK 1812 CG 2 3 INP 2 2 3 TG 5 C21 R13 22K VR2 R32 383K 2 GND FG 4 5 Q1 PHM21NQ15T R7 0 9 10 11 TP3 L1 39uH PA2050.393 2 5 1 4 3 SW1 1 1 VCCBOOST 6 C3 1uF 16V Q12 BC856T 1 6 +VIN R5 10 VFB 1 T1 PA0856.003 7 8 1 1 D5 PDZ9.1B VU1 C D2 BAS516 1 2 VR2 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-D REV LT1952EGN-1, LTC3900CS8, LT4430ES6 Tuesday, February 20, 2007 SHEET 1 1 A2-D OF 1 A