A B C D E REVISION HISTORY DESCRIPTION APPROVED ECO REV - 1 PRODUCTION DATE Oct 01, 2012 ZHONGMING Y. 4 4 VOPT VIN VIN 10V-15V 7 + E2 GND C1 330uF 25V SANYO (Opt) C2 22uF 16V 1210 C3 22uF 16V 1210 C5 0.22uF 100V 0805 R1 16k 1206 R13 16k 1206 4 10 2 8 6 11 5 VOPT+ [email protected] (Opt) L1 1.8uH 744318180 Wurth Electronik T1 SW E1 E3 C6 4.7uF 100V 1812 C7 4.7uF 100V 1812 VOUT+ E6 R2 11.8k 1% 1206 C8 4.7uF 100V 1812 R14 11.8k 1% 1206 R15 11.8k 1% 1206 R16 11.8k 1% 1206 + VOUT+ [email protected] C9 470uF 63V E7 VOUT- 9 3 EXT_EN RUN R4 200k 1% SHDN 1 2 3 INTVCC RFB 10 12 11 C11 0.33uF 14 R9 270k C12 470pF 5 U1 LT3748EMS R5 36k JP1 VIN EN/UVLO R10 40.2k 1% C15 6800pF SS GATE TC SENSE 6 8 82.5k 1% R7 0 Ohm 7 9 1 750311591 3 D3 VOPT(Opt) 1 Q1 HAT2173H-EL-E Renesas R8 R12 0.005 1206 C13 2 2.2nF 250V 1812 CUSTOMER NOTICE APPROVALS PCB DES. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. B C TECHNOLOGY RB APP ENG. ZHONGMING Y. 1630 McCarthy Blvd. Milpitas, CA 95035 www.linear.com Phone: (408)432-1900 Fax: (408)434-0507 1 LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY TITLE: SCHEMATIC HIGH EFFICIENCY ISOLATED FLYBACK CONVERTER SIZE C:\PADS PROJECTS\1860B\REV_B(09-17-12)\SCH\1860B_REV1.DSN A 3 2 PDS3200-13 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. 1 E4 D2 C10 DFLS1100 4.7uF 16V 0805 R6 22 C14 6800pF GND GND R11 6.04k 1% 16 VC REF 12 R3 0 Ohm 1 3 SHDN 2 3 DIODE E5 D1 1SMB5943BT3 N/A SCALE = NONE DATE: D IC NO. REV. LT3748EMS DEMO CIRCUIT 1860B Oct 01, 2012 1 SHEET E 1 OF 2 A B C 3 6 7 4 SW 5 VOPT 4 2 9 10 VOPT 1 47uH IHLP-4040DZ-ER-470-M11 VISHAY (Opt) T3 4 8 2 11 VOUT+ L2 750311456 (Opt) 3 E DIODE T2 VIN D C16 100uF 63V (Opt) 3 6 5 3 9 1 12 750311604 (Opt) 2 2 Optional Circuit CUSTOMER NOTICE APPROVALS LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. RB VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APP ENG. ZHONGMING Y. TITLE: APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. TECHNOLOGY 1630 McCarthy Blvd. Milpitas, CA 95035 www.linear.com Phone: (408)432-1900 Fax: (408)434-0507 LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY SCHEMATIC HIGH EFFICIENCY ISOLATED FLYBACK CONVERTER 1 SIZE C:\PADS PROJECTS\1860B\REV_B(09-17-12)\SCH\1860B_REV1.DSN THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. A B N/A SCALE = NONE C DATE: IC NO. REV. LT3748EMS DEMO CIRCUIT 1860B Oct 01, 2012 D 1 1 SHEET E 2 OF 2