1 2 3 4 5 REVISION HISTORY ECO REV DESCRIPTION DATE APPROVED 1 PRODUCTION 11/01/13 KURK M. T1 5 [1] +VIN E1 6 2 1 L1 L2 [1] 7 8 9 A E3 C1 C2 C5 C6 C29 [1] [1] [1] OPT [1] +VOUT A [1] 4.7uH + C4 100pF R8 47K 0.25W C25 2.2uF 100V -VIN C10 47uF 20V E2 R11 [1] C11 + 0.1uF 5 6 7 8 R1 0 B 4 R7 [1] D8 R16 169k 1% Q4 Si7336ADP OPT 4 SG SENP SENN SGND/PGND SFST VC 17 6 OSCAP D7 4 3 2 1 B [1] 3 2 1 1 16 PG ENDLY ROCMP R18 [1] 1% 7 3 R20 12k 4 1% 14 R15 3.01k R14 15k 1% Q3 [1] 8 7 6 5 C PGDLY TON C12 OPT VCC 2 15 8 7 6 5 Q12 R27 [1] Q13 E E R28 [1] C SG U1 LT3825EFE UVLO SYNC 10 FB 5 8 1 2 3 [1] -VOUT C7 4.7nF 250V BAT760 SG C Q1 [1] 12 R9 FMMT718 [1] 11 9 8 C23 C17 C18 C13 47pF 10nF OPT 0.1uF R22 5 C20 2.2nF 1 [1] 1uF C T2 C19 [1] C21 R26 15 C8 0.1uF [1] FMMT618 R4 330 0.5W CCMP R10 [1] R2 [1] 13 R3 [1] 1% E4 C3 D2 BAS21LT1 R5 412K 1% 3 4 R6 [1] B C30 22uF 100V 10 11 12 B 36V- 72V R13 10K D5 4 BAT54 PA0184 R19 100k [1] ASSY. VOUT IOUT R2 R6 R7 R9 -A 3.3V 12A 4.7 28.7K 110 39 -B 5V 8A 4.7 29.4K 150 -C 12V 5A 15 R3 R10 R11 R18 R22 R28 R27 0.02 39 110 909 20K OPT 47 20 0.018 OPT 150 1.47K 2K OPT 47 68 0.012 OPT 160 1.82K 7.5K D7 C5 C19 C23 C29 2.2nF 47uF 2.2nF 10nF 47uF 2.2nF 47uF 220pF 22uF 470pF OPT 330pF C1,C2 C3 B0540W 47uF B0540W OPT Q3 T1 L2 470uF PA1477NL 0.1uH 2.2nF 470uF PA1735NL 0.1uH BSC320N20NS BSC011N03LSI 3.3nF 150uF PA1736NL 1.0uH BSC320N20NS BSC028N06NS Q1 D D 30.9K 160 0 OPT 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. E THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 1 2 3 Si7336ADP Si4490DY APPROVALS PCB DES. APP ENG. TECHNOLOGY MI KURK M. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only E TITLE: SCHEMATIC SYNCHRONOUS FLYBACK CONVERTER SIZE N/A SCALE = NONE 4 IC NO. LT3825EFE REV. DEMO CIRCUIT 894C DATE: 12/03/13 11:01:43 SHEET 1 5 1 OF 1