REVISION # This circuit is proprietary to Linear Technology and supplied for use with Linear Technology parts. Customer Notice:Linear Technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customers 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 Applications Engineering for assistance. REVISION HISTORY SD PC FD AD 0 DESCRIPTION 0 0 0 1st Release DATE APPROVED 7/15/09 KSz OPTIONAL CIRCUIT R13 R14 (Opt) 0805 Q4 SO8-PWRPAK (Opt) L2 10uH PWMDRAIN FB1 E14 OUT CDRH104R-100MC Sumida C17 + 47uF 100V (Opt) 1206 E2 FBMJ4516HS720NB C16 2.2uF 100V C15 0.01uF 100V LED BUCK-BOOST C9 PVIN 8V - 80V E1 E13 GND VIN 8V - 80V OUT PVIN R1 499k 1% R2 0 Ohm D1 1 Cooper Bussmann OUT WARNING! HIGH VOLTAGE (Opt) L1 47uH HC9-470-R C10 2.2uF 100V 2 C1 2.2uF 100V C2 2.2uF 100V PDS5100-13 R3 (Opt) C3 2.2uF 100V Q2 Si7454DP-T1-E3 Siliconix E5 C4 1uF 100V OUT E6 R23 (Opt) R4 93.1k 1% 7 R15 1M 1% E10 12 CTRL R7 130k 1% E15 GND 13 C14 (Opt) R16 (Opt) R18 (Opt) * R6 1.82M 1% C8 (Opt) E4 PVIN R20 15 GND Q5 (Opt) SOT23 R9 24.9k 1% FB VREF ISP 2 4 PWMDRAIN 3 CTRL PWMOUT ** R22 1 E8 Q1 Si2328DS Siliconix LED BOOST 0 Ohm INTVCC PWM SS VC GND RT 10 5 17 11 PWM 8 E9 PWM R21 (Opt) D2 (Opt) PWM 0.20 1% C18 (Opt) SENSE SHDN/UVLO C5 4.7uF 10V R10 * 16 GATE ISN 9 INTVCC E11 14 VIN R5 (Opt) 6 C12 2.2uF 100V RS1 0.015 U1 * C11 2.2uF 100V R19 (Opt) (Opt) SHDN/UVLO E7 LED + 80V max 500mA RS2 3 R11 (Opt) C7 0.1uF R17 10k C6 4700pF R8 37.4k 1% 300kHz INTVCC C13 (Opt) * APPROVALS ASSY U1(IC) -A LT3756EMSE-2 -B LT3756EMSE-1 U1-9 (Name) OPENLED SYNC E11 (Name) R10 OPENLED 100k SYNC OPT DRAWN: Rudy Bautista ENGINEER: KSz LINEAR TECHNOLOGY CORPORATION 1630 McCARTHY BLVD MILPITAS, CA. 95035 (408)432-1900 (408)434-0507 (FAX) Title: LT3756EMSE/-2/-1 APPROVED: CHECKED: Date: Monday, August 03, 2009 SD Document Number www.linear.com LTC Confidential For Customer Use Only High Voltage LED Controller Rev Demo Circuit 1319B C:\ORCADWIN\CAPTURE\1319B\1319B_00_REV1.DSN Sheet 1 1 of 1