5 VIN 3V-14.4V D GND 4 3 2 VIN E1 D1 DFLS140 2 1 L1 10uH R1 1M 0402 E2 C1 10uF,16V 1210 CDRH105R-100 C2 10uF,16V 1210 U1 GND RUN 16 E5 SYNC 6 E7 15 13 R4 4.7k C C8 OPT C9 0.01uF R5 C10 1uF 16V 105k 1% 4 2 1 R6 10k 1% 5 ITH PWMOUT 8 ILIM 3 VREF GATE 9 SENSE 12 FBP INTVcc SS RGATE OPT 1206 10 C3 4.7uF 10V 0805 FBN FREQ Q1 Q2 (OPT) Si4362DY 4 C5 10uF 25V 1210 C6 10uF 25V 1210 C7 OPT +C11 +C12 560uF 50V OPT 560uF 50V OPT E9 +C13 270uF 50V OPT D GND +C14 270uF 50V OPT R3 12.4k 1% C R7 0.040 1% 0805 LED3 R8 20k RUN SYNC 5 6 7 8 E6 VIN 11 OV/FB 14 PWMIN R10 OPT C4 10uF 25V 1210 E3 VOUT LED+ 350mA 25V OVP 1 2 3 SYNC 7 R2 237k 1% GND RUN PWMIN VOUT 17 PWMIN LTC3783EFE E4 1 E8 LED- Q3 FDN337N (SOT23) SO8 OPT 2 1 R9 0.3 1% 0805 B CUSTOMER NOTICE NOTES: UNLESS OTHERWISE SPECIFIED A 1. ALL RESISTORS ARE IN OHMS, 0603. ALL CAPACITORS ARE IN MICROFARADS, 0603. CONTRACT NO. 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 CIRUIT 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. 5 4 B 3 APPROVALS DRAWN: CHECKED: APPROVED: ENGINEER: KEITH S. DESIGNER: TECHNOLOGY KIM T. TITLE: 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 LTC Confidential-For Customer Use Only SCHEMATIC A HIGH VOLTAGE LED BOOST CONTROLLER SIZE DWG NO. A DATE: DC850A-2 * LTC3783EFE Tuesday, August 09, 2005 2 SHEET 1 1 REV A OF 1