A B C 4 CPVIN 1uF 50V (Opt.) VIN VIN 6V - 30V SW R1 0 1206 E3 CVIN 1uF 50V OUT GND SHDN / UVLO E5 R13 (Opt.) 0603 5 U1 LT3519EMS 7 +C1 OUT ANODE E1 6 PVIN 6V - 30V VIN CATHODE 11 ISN 12 4 R11 (Opt.) 0603 3 2 R9 100k 0603 GND CTRL GND 14 OPENLED R7 29.4k OPENLED E9 E11 R10 137k LED- E10 M1 Si2318DS 1 2 2 2 GND 13 3 CTRL R12 (Opt.) 0603 PWM LED+ 100mA 16 R8 1M 3 9 OUT GND VIN GND PVIN FB 1 E8 E2 COUT 4.7uF 50V E7 VREF GND 15 R6 (Opt.) 0603 COUT2 (Opt.) R4 1M SHDN/UVLO 8 R5 243k OUT R2 2.49 0805 E4 R3 1M E6 10 ISP 3 PWM E L1 68uH DR74-680-R PVIN 4 D E12 LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY Linear Technology Corporation 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. This Circuit Is Proprietary To Linear Technology And Supplied For Use With Linear Technology Parts. 1 NOTES: UNLESS OTHERWISE SPECIFIED ALL RESISTORS ARE 0402 A B C 1630 McCarthy Blvd. Milpitas, CA. 95035 Phone (408) 432-1900 Fax (408) 434-0507 www.linear.com 1 Title LT3519EMS, Size 4W LED Driver Document Number Rev. A Demo Circuit 1482A Date: Tuesday, July 21, 2009 D Sheet 1 of E 1