REVISION HISTORY ECO REV - 3 DESCRIPTION PRODUCTION APPROVED DATE KEITH S. 06-20-12 OPTIONAL FOR BUCK MODE C9 OPT. 1210 OUT PVIN PVIN 8V - 60V E1 E13 OUT C10 4.7uF 100V 1210 R15 OPT. 1206 D1 PDS5100H R11 0 1206 LED+ RS2 3 2 COOPER C1 4.7uF 100V 1210 M1 BSC123N08NS3 C2 2.2uF 100V 1210 R3 1.0M 1% 0603 C11 2.2uF 100V 1210 C3 2.2uF 100V 1210 C12 2.2uF 100V 1210 C13 OPT. 1210 0.25 1% 1/2W 1206 E7 OUT Q2 OPT SOT23 R13 E5 C4 1uF 100V 1206 OUT R1 499k 1% R16 OPT. 0603 EN/UVLO E6 R2 90.9k 1% R7 1M 1% CTRL E10 R8 140k 1% INTVCC 7 6 E2 OPENLED C5 1uF 10V R9 100k 0603 9 16 VIN EN/UVLO SENSE 2 FB VREF ISP U1 CTRL ISN LT3761EMSE PWMOUT 124k 0603 GND E12 NOTE: UNLESS OTHERWISE SPECIFIED FB C7 0.01uF 0603 OPTIONAL FOR SHORT CIRCUIT 4 C14 OPT 3 1 OPT PWMOUT E8 M2 Si2328DS R23 5 GND PWM RT 0603 LED - R24 OPT R12 0805 17 11 8 R10 DIM D2 ES1C OPT OPT. 0 0603 OPENLED 10 E4 R25 OPT. C15 OPT INTVCC E11 GND M4 R14 OPT. 0805 LED + 60V / 1A OPENLED 15 GATE DIM/SS VC E14 OPT. R4 18.2k M3 1% OPT 0.008 2010 R22 OPT. 13 INTVCC RS1 14 12 OUT R17 OPT. OPENLED OUT 1 PGND VIN 8V - 60V E3 L1 10uH HC9-100-R R5 10k C6 4700pF R6 29.4k 1% 350kHz E9 C8 0.047uF R18 OPT. 0603 Q3 R27 INTVCC OPT 0603 OUT OPT FB SOT23 INTVCC R26 OPT. 0603 D3 PVIN LED+ OPT. FB OPTIONAL LEVEL SHIFT FOR BUCK MODE OR BUCK-BOOST MODE THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. APPROVALS PCB DES. APP ENG. Q1 OPT. SOT23 R20 1N4148W OPT OPTIONAL FOR SHORT CIRCUIT CUSTOMER NOTICE TECHNOLOGY JW KEITH S. TITLE: SCHEMATIC SIZE N/A SCALE = NONE R19 OPT. R21 OPT. 1. ALL RESISTORS ARE IN 0402. ALL CAPACITORS ARE IN 0603. 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. PWM DATE: IC NO. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only HIGH VOLTAGE LED CONTROLLER WITH INTERNAL PWM DIMMING REV. LT3761EMSE DC1772A Wednesday, September 05, 2012 3 SHEET 1 OF 1