5 4 3 2 1 REVISION HISTORY D3 BAS70JFILM 1 2 D E1 VIN 10uF 100V GND C2 2.2uF 100V 1210 C10 0.1uF 100V 0805 C12 1uF 100V 0805 3 VIN E3 SHDN U1 LT3748EMS 1 R3 357k EN/UVLO INTVCC R6 16.5k RFB C16 4.7uF 25V 0805 5 16 C GATE R12 0 2 D2 BAV20WS 1 2 5 NOTE: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS ARE IN OHMS, 0402 ALL CAPACITORS ARE IN MICROFARADS, 0402. TAIYO YUDEN FB MJ3216HS800 VIN FB1 BEAD R11 0 R10 0.03 0805 E5 VOUT- SUMIDA CDRH4D22/HP L1 10uH C4 0.01uF,100V 0603 C5 4.7uF,100V 1812 VIN C6 22uF,100V SANYO + C14 0.033uF C11 6800pF C8 470pF R5 6.04k B 2220 APPROVALS LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; TECHNOLOGY HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. KT VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APP ENG. ZHONGMING Y. TITLE: SCHEMATIC APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only A NON-OPTO ISOLATED FLYBACK CONVERTER SIZE THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 C3 47uF,16V 2220 VOUT- VOUT+ [email protected] OPTIONAL CIRCUIT 7 CUSTOMER NOTICE A E4 C B R9 57.6k D 10 R1 12k C7 0.1uF DATE ZHONGMING Y. 10-04-10 VOUT+ R4 2k 1206 3 Q1 FDMC2674 4 C15 47pF OPT 14 GND GND 8 9 TC 11 12 SS VC 10 RREF SENSE PRODUCTION T1 D1 PULSE, PA2467NL 10MQ100NPbF WE, 750311439 1 6 2 1 R8 2k 1206 APPROVED R7 121k 0603 6 2 DESCRIPTION 5 6 7 8 +C1 E2 REV __ 1 2 3 VIN 30V - 75V ECO 4 3 IC NO. N/A SCALE = NONE DATE: REV. LT3748EMS 2 DEMO CIRCUIT 1557A Monday, October 04, 2010 2 SHEET 1 1 OF 1