1 2 5 D2 BAS21LT1 Q1 Si7302DN 5 6 7 8 R3 26.1K R1 R7 20 0805 0 R20 12.1k R16 100K R18 R19 1.21K 38.3K C17 33pF SFST 13 CCMP SENN 11 6 OSCAP A D7 4 B0540WS 321 C 17 SGND/PGND 7 SYNC ENDLY 4 3 TON R15 3.01k 14 ROCMP R14 14.0k 15 PGDLY -VOUT Q12 E E Q13 C R27 47 0805 R28 OPT 0805 SENP 12 LT3825EFE 5 C12 OPT 8765 Q3 Si4324DY 123 U1 10 UVLO R2 3.3 1206 SG 1 PG 16 8 FB C3 1.0nF 0805 4 SG VCC 2 R5 383K E4 C7 4.7nF 250V 1206 C11 0.1uF + 3 4 100 4 2 C10 47uF 20V 6032 R6 10 11 12 +VOUT E3 3.3V@6A + C29 150uF 6.3V SANYO 6TPB150MC 1 E2 C4 47pF 250V 0805 2 C18 OPT R9 0.04 0.25W 1206 R4 330 FMMT718 FMMT618 R26 15 C8 0.1uF VC 9 C23 10nF C13 0.1uF B -VIN R8 47K 0.25W 1206 C25 2.2uF 100V 1812 C2 47uF 6.3V 1210 R22 10.0K T2 8 5 C19 2.2nF C20 2.2nF 1 C21 1uF 1206 1 A C30 + 10uF 100V 4.7uH C1 47uF 6.3V 1210 0.48uH 3 D5 4 BAT54WS PA0184 R13 10K 2 36V- 72V L1 E1 L2 1 B +VIN 6 2 1 T1 PA2069NL 7 8 9 B B 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. 1 CONTRACT NO. APPROVALS DRAWN Helen DATE 8/08/06 CHECKED TECHNOLOGY TITLE LT3825EFE SYNCHRONOUS FLYBACK CONVERTER SIZE CAGE CODE APPROVED ENGINEER David Burgoon 8/08/06 DESIGNER Thursday, May 31, 2007 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 SCALE: FILENAME: 2 DWG NO REV A DC1143A SHEET 1 OF 1