5 4 3 2 C20 22V - 75V E1 C2 C3 2.2uF 100V 1210 + C1 100uF 100V GND R11 C4 C5 1210 OPT 1 3 1 SHDN 2 EN U1 LT3748EMS INTVCC 1206 C GATE C12 2200pF SENSE C9 4.7uF 16V 0805 R14 BAT41KFILM SOD523 10 0603 D1 1 12 3 2 9 11 4 5 8 10 6 7 VOUT+ E5 PDS5100 C16 C17 C18 22uF 16V 1210 L1 0.47uH OPT. D4 DFLZ13 13V ROUT OPT 1210 Midcom 750311607 0 R13 12V / 2.5A VOPT C13 C14 C15 OPT 1210 VOUTE6 150K 0603 6 0805 R7 16 5 6 7 8 Q1 SI7450DP 4 C 0603 7 R8 0 1 2 3 0603 RREF C19 OPT. 0603 R10 0.015 0805 14 GND GND 9 8 11 VC SS TC OPT. 5 EN/UVLO RFB 12 220pF 22 D T1 D5 43 R6 32.4k 250V 1812 100V 0805 D3 3 10 C10 R12 VIN R3 402k JP1 SHDN 43 C6 1uF 100V 1206 E2 1206 R15 100V 0805 270pF VIN D 1 R1 12.1k C7 0.1uF B R9 63.4K C11 22nF C8 470pF R5 6.04K B NOTE: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS ARE 0402. ALL CAPACITORS ARE 0402. 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. A THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 4 3 TECHNOLOGY 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only TITLE: SCHEMATIC A 30W NON -OPTO FLYBACK CONVERTER SIZE IC NO. N/A DATE: SHEET Wednesday, July 23, 2014 2 REV. LT3748EMS DEMO CIRCUIT 1694B 1 2 1 OF 1