4 D3 BAS516 1 VCCBOOST 6 C3 1uF 16V TG 5 3 INP TS 4 0 1 COMP 2 FB=1.23V 3 ROSC 4 SYNC R3 0 SOUT 16 VIN 15 OUT 14 PGND 13 C9 R20 100pF 66.5K 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 BLANK 9 R23 910 R24 82K R6 OPT C7 220pF C8 100pF VU1 CU1 4.7uF 16V 1206 1 6 2 5 3 4 R26 220 C23 1uF 16V SW0 VU1 0805 C5 0.22uF 50V 0805 4 1 3 2 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 D11 BAS516 1 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 4700PF 4.42K 1% C18 10pF R35 +VO1 137K 1% 0805 C24 47pF 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 SW1 R16 10K 0805 D9 PDZ7.5B 2 1 4 1 R47 10K 1 2 3 4 5 6 7 8 R10 1K L3 OPT Q13 IRF6217 2 OUT R46 OPT 1 Q9 BCX55 R17 560 C25 OPT 1206 -VOUT 4 VCC U6 PS2801-1 D TP5 CG R44 10.7K 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 SYNC 6.3V APXE VAUX R30 1.2K R43 OPT D8 OPT C6 OPT 0805 * CSYS VAUX 4 2 VU1 C11 0.01uF C13 0.47uF 10V 0805 +VOUT + 470uF TP6 D6 B0540W 2 1 C4 0 OHM RES 5 6 7 8 +5V R8 2.2 TP4 CO1 CO2 OPT CO3 OPT 100uF 6.3V TDK 1812 Q3 HAT2165 T2 PE-68386 PULSE ENG. B D12 BAS516 2 1 Q2 HAT2165 +VO1 5 4 3 CG D7 OPT VFB OPTIONAL CIRCUIT 3 2 0805 R33 158K +VB R28 196K FG RCS1 0.008 2010 OUT 2 D10 BAT760 1 9 10 11 R9 47 OPT L1 1.5uH 2 1 C2 1500pF 200V 1206 1 R42 U1 LT1952EGN-1 D1 BAS516 SW1 4 5 Q1 HAT2244 R7 0 2 2 3 R14 33K R15 115K VR2 R32 332K 2 GND C21 R13 22K Q12 BC856T 1 +VIN SW0 U2 LTC4440ES6-5 C 6 R5 10 VFB 1 TP3 SUMIDA CDEP147NP-1R5MC-95 3 D5 PDZ9.1B TP2 VU1 D2 BAS516 2 2 -VIN 1 2 D VR2 CIN3 OPT 1812 T1 PA0872.004 7 8 1 1 CIN1 CIN2 6.8uF 50V 1812 3 L2 1.5mH DO1607B-155ML-C 2 R11 33K Q10 PZTA42 VU1 1 * 4 2 1 1 +VIN +VB R1 2.2 2 1 +VIN TP1 3 2 5 DATE: 2 DWG NO. DC968A2-B REV LT1952EGN-1, LTC3900CS8, LT4430ES6 Tuesday, February 20, 2007 SHEET 1 1 A2-B OF 1 A