REVISION HISTORY ECO R19 OPT 0805 M2 OPT C2 2.2uF 100V 1210 R15 OPT 1206 R12 0 1206 2 R6 40.2k 31 R13 32 C8 2.2uF 100V E4 1210 PGND 20 SW 38 21 SW SW 8 SW 9 SW C7 2.2uF 100V 1210 ISP ISN E7 LED+ 67V LED MAX 370mA RS1 R8 25 0.68 1% 1206 16.2k VREF C6 2.2uF 100V 1210 R22 OPT 1206 R7 1M 1% EN/UVLO CTRL C5 2.2uF 100V 1210 28 E8 PWMDRAIN 27 LED- M1 Si2328DS 4 GND INTVCC GND PGND PGND 17 12 R2 33k VMODE 16 VC R11 0 R10 0805 RT PGND 30 23 SS PGND 36 PWMOUT PGND C10 0.1uF PWM 15 35 PGND 33 R1 28.7k 375kHz C15 OPT 1210 OUT 0603 PWM * SEE QUICK-START GUIDE FOR INPUT RANGE FB 14 E9 R14 OPT 0603 OPT NC 13 INTVCC R4 100k 0603 NC 1 CTRL E6 10 R24 OPT 0603 0603 EN/UVLO 03/10/10 E5 C4 2.2uF 100V 1210 Q1 OPT U1 LT3956EUHE C1 OPT 1206 6 R3 332k K. SZOLUSHA PWMDRAIN R17 OPT VIN R5 332k DATE PRODUCTION OUT C3 2.2uF 100V 1210 OUT R16 OPT 0603 E10 OPT 0805 PVIN R18 OPT OUT PGND R21 APPROVED 3 D1 PDS3100-13 VIN 6V - 80V* E3 OPT 1206 DESCRIPTION C14 OPT 1210 GND E2 OPT L1 22uH PVIN OUT C13 24 6V - 80V* OPT 37 E1 PVIN R23 OPT 1206 C12 R20 REV 34 3 -VMODE 0 E11 0805 VMODE R9 100k 0603 E12 GND INTVCC E13 C11 4.7uF 10V 0603 GND C9 4.7nF NOTES: UNLIESS OTHERWISE SPECIFIED, 1. CAPACITORS AND RESISTORS ARE 0402 CASE SIZE. 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. APPROVALS TECHNOLOGY PCB DES. MI APP ENG. KEITH S. 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 80VIN / 80VOUT LED DRIVER SIZE N/A SCALE = NONE IC NO. REV. LT3956EUHE DEMO CIRCUIT 1521A DATE: Friday, April 02, 2010 SHEET 1 3 OF 1