5 4 3 PVIN OPT VIN E3 3V - 30V 40V TRANSIENTS E5 GND CPVIN 1uF 50V 1206 VIN GND R6 0 R5 OPT E10 VREF R7 0 0603 D 10 CTRL 5 VREF CUSTOMER NOTICE NOTE: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS ARE IN OHMS, 0402. ALL CAPACITORS ARE IN MICROFARADS, 0402. PVIN R8 392k 1% R3 OPT 1 Q2 OPT R12 10k 1% E9 R14 16.5k 1% 1MHz THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 3 TECHNOLOGY KIM T. CHECKED: APPROVED: ENGINEER: KEITH S. DESIGNER: SYNC E11 GND APPROVALS DRAWN: C R9 OPT 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 CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. 4 1 ISP 15 ISN 14 FB 12 C5 4.7nF A OUT R15 OPT B LED+ 330mA OUT LED+ R13 3.3k E2 2 TGEN C4 0.01uF 5 OUT MONITOR OUTPUT 3 R10 OPT 13 TG 16 SYNC E7 PWM LED+ 7 0603 9 U1 LT3517EUF RT R11 OPT SHDN 6 4 E8 VC CTRL OPT R1 0.300 Q1 1% Si2319DS 1206 2 3 8 PWM +C1 C6 2.2uF OPT 1206 CVIN 1uF 50V 1206 R2 OPT 1206 SW 1 SW 2 R4 51k 0603 E6 C E1 PVIN OUT SHDN OUT COUT 2.2uF 50V 1206 11 E12 R16 OPT 1206 GND GND +C2 1.6A 17 D CIN BOOST VIN 3 PVIN 3V - 40V 1 D1 10MQ060N 2 1 L1 15uH SS E4 2 B 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 LTC Confidential-For Customer Use Only TITLE: SCHEMATIC A FULL-FEATURED LED DRIVER WITH 1.5A SWITCH CURRENT SIZE A DATE: DWG NO. DC1279A-1 * LT3517EUF Thursday, October 25, 2007 2 SHEET 1 REV A-1 1 OF 1