REVISION HISTORY ECO REV __ 1 DESCRIPTION PRODUCTION E1 R3 400K R4 3 4-26-10 VIN 7V - 28V + CIN1 22uF 50V GND 4 MSD1278 U1 LT3757EDD C14 50V 1210 ON 2 C12 100pF R6 14K C11 4.7nF 4 R7 42.2K 5 C13 3 VC VIN INTVcc 10 8 C10 4.7uF 10V 08054 FBX RT GATE SYNC SENSE D1 PDS1045 5 6 7 8 3 1 SHDN/UVLO Q1 Si7850DP E3 7 6 SS 0.1uF VOUT -15V @ 1A C3 22uF 25V 1210 1 2 3 9 GND 2 OFF 10uF 3 1 RUN 1 2 E5 JP1 GND E4 11 SYNC DATE GEORGE Q. E2 100K VCC C1 2.2uF 35V 1210 L1 15uH 1 2 APPROVED E6 R5 0.02 1W 0815 R1 357K 1% R8 10K R2 20.0K 1% GND E7 CUSTOMER NOTICE NOTE: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS ARE IN 0603. ALL CAPACITORS ARE IN 0603. 2. INSTALL SHUNT AS SHOWN. 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. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. APPROVALS PCB DES. APP ENG. TECHNOLOGY HZ GEORGE Q. 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 HIGH EFFICIENCY CUK CONVERTER SIZE N/A SCALE = NONE DATE: IC NO. REV. LT3757EDD 1 DEMO CIRCUIT 1548A Friday, August 13, 2010 SHEET 1 OF 1