5 4 3 2 1 REVISION HISTORY DESCRIPTION APPROVED ECO REV 1 2 3 - 1st PROTOTYPE 2nd PROTOTYPE PRODUCTION DATE ANDY R ANDY R ANDY R July 18, 2011 Dec 06, 2012 Aug 30, 2013 R21 (OPT) 0603 D D C15 PVIN R1 499k 1% 0603 E1 R12 (OPT) 0603 R11 EN/UVLO 0 Ohm E2 PVIN 8V - 60V 110V MAX. 63V OVLO C2 2.2uF 100V 1210 VOUT R8 0 Ohm 1206 E3 VIN 8V - 60V 110V MAX. 63V OVLO C1 1uF 100V 1206 E4 GND R9 (OPT) 1206 R13 (OPT) 0603 C4 2.2uF 100V 1210 R14 (OPT) 0603 24 VREF R16 100k R17 100k R19 (OPT) 23 10 R18 (OPT) 0603 E5 9 E6 6 14 13 B E8 ISMON L1 22uH 5 C13 0.1uF 27 26 19 OVLO IVINP IVINN GATE R20 0 Ohm 0603 INTVCC C14 0.047uF C5 4.7uF 10V E9 GND 20 FB ISP ISN CTRL1 TG CTRL2 IVINCOMP PWM SHORTLED RAMP ISMON OPENLED INTVCC VC RT 12 GND GND GND GND GND 4 17 21 22 29 R23 C8 2.2uF 100V 1210 C9 2.2uF 100V 1210 VREF 18 E11 VOUT E12 LED+ 400mA 87V D2 ES1C R25 (OPT) 0603 R26 (OPT) 0603 Q2 (OPT) SOT23 (OPT) R6 0603 M3 13.3k (OPT) 1% SOT23 7 R27 (OPT) 0603 /OPENLED R31 (OPT) 0603 R30 (OPT) 0603 IVINN 1 C E13 GND E14 GND R24 RS1 0.015 1% 2010 C20 (OPT) 0402 PVIN 2 3 E15 28 R28 100k 16 R29 E17 /OPENLED C11 0.01uF 8 IVINCOMP E16 INTVCC 15 SHORTLED B OPENLED 100k R7 10k E18 GND R22 R5 31.6k 1% 250kHz C12 0.01uF APPROVALS LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APP ENG. APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. NOTE: UNLESS OTHERWISE SPECIFIED. 1. ALL RESISTORS 5%, 0402. 2. ALL CAPACITORS 0603. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 4 3 TECHNOLOGY RB ANDY R N/A SCALE = NONE 2 1630 McCarthy Blvd. Milpitas, CA 95035 www.linear.com Phone: (408)432-1900 Fax: (408)434-0507 A LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY TITLE: SCHEMATIC SIZE C:\PADS PROJECTS\1827A\SCH\1827A_REV3.DSN 5 M2 Si7115DN-T1-E3 0.620 1% 2010 C19 (OPT) 1210 Q1 (OPT) SOT23 CUSTOMER NOTICE A C10 2.2uF 100V 1210 (OPT) 0603 VREF 11 C6 0.1uF GND R4 1.00M 1% 0603 VIN SS (OPT) E10 SENSE EN/UVLO RS2 C7 2.2uF 100V 1210 PDS5100-13 M1 BSC190N12NS3G 25 (OPT) 1210 D1 HC9-220-R Cooper Bussmann U1 LT3795EFE E7 PWM IVINN 0.015 1% 2010 R3 12.4k 1% VOUT R15 (OPT) CTRL2 C3 2.2uF 100V 1210 VOUT (OPT) 1210 C18 RS3 C CTRL1 R32 (OPT) 0603 C21 (OPT) 12.5 Dia. SMD + HIGH VOLTAGE WARNING! (OPT) 1210 C17 PVIN R2 115k 1% R10 (OPT) PVIN (OPT) 1210 C16 VOUT IC NO. 110V LED CONTROLLER WITH SPREAD SPECTRUM FREQUENCY MODULATION LT3795EFE DC1827A MODIFY DATE: Aug 30, 2013 SHEET 1 1 OF REV. 3 1