5 4 3 2 1 REVISION HISTORY ECO REV DESCRIPTION 2 PRODUCTION APPROVED WEI G. DATE 08-15-12 CAUTION: HANDLING HIGH VOLTAGE INVOLVES RISK TO LIFE. COMPLY WITH SAFETY REGULATIONS! D D C2 0.22uF 450VDC FILM R5 150 90 - 277VAC 1206 J1 L 2 1 N R11 499k 1% C R3 200k 1% R7 10k D2 BAV20W R1 249k 1% 1206 D4 SMBJ170A C3 R2 249k 1% 1206 12 3 4 4 CAC1 0.1uF B R20 20k 1% R21 0 R22 OPT 3 2 D1 CMR1U-10M NC FB GATE 4 6 + C10 330uF 63V + C11 330uF 63V D9 SMBJ48A R27 20k 0805 1 LED+ 2 11 LED1A / 48V 1 C C9 47pF 9 14 Q1 IPB60R165CP R25 20 VREF SENSE CTRL3 INTVCC CTRL2 COMPCOMP+ L1 1mH J2 C23 1uF 100V 1206 10 9 10 DCM VINSENSE 2 310VAC R19 40.2k 1% VIN 11 16 3.48K R18 100k 1% 8 3 2 5 R4 9.31k 1% BAV20W R23 D3 PDU340 1 D8 CV385K10R L2 27mH B82731H2701A030 2 1 R33 200k 1210 C13 1.5nF 0805 250V 10uF 50V V1 F1 300V, 2.5A SS-5H-2.5A R32 200k 1210 + R10 499k 1% T1 750817251 C21 4.7pF 15 13 8 7 R8 0.03 1206 C8 4.7uF 16V 0805 C20 2200pF Y1 B C6 10nF CTRL1 2 1 GND CT LT3799EMSE-1 17 B1 HD06 FAULT 6 4 1 U1 5 C7 10nF - 3 + 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 NOTES: UNLESS OTHERWISE SPECIFIED, 1. ALL CAPACITORS AND RESISTORS ARE 0805. CONTRACT NO. APPROVALS PCB DES. ENG. TECHNOLOGY JW WEI G. TITLE: SCHEMATIC 48W OFFLINE ISOLATED FLYBACK LED CONTROLLER WITH ACTIVE PFC SIZE N/A THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 4 3 DATE: 2 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 LTC Confidential-For Customer Use Only IC NO. REV LT3799EMSE-1 DC1947A Wednesday, November 28, 2012 2 SHEET 1 1 OF 1 A