1 2 PVIN TP9 1 2 2 L3 15uH Sumida CDRH3D14/HP-150M R21 10k 0.2 Q4 SI2303BDS 2 3 LED2+ LED2+ TP11 LED2- LED2- C6 0.1uF R11 (OPT) D2 RB160M-60TR TP12 L2 15uH Sumida CDRH3D14/HP-150M LED2- R23 2 R13 LED2+ TG2 17 SW2 20 27 PWM3 TP10 TP14 1 59K OVP2 11 Q3 MMBT3906T PVIN 6 FADJ VREF 1 FADJ 2.1MHz ADJUST C3 1000PF R12 0 C4 1000PF R14 0 2 C5 1 3 JP2 R15 0 CAP1 15 LED1 14 9 VC1 TG1 13 SW1 16 8 VC2 7 VC3 R2 0.2 Q2 SI2303BDS 2 3 LED1+ LED1+ TP3 LED1- LED1- TP4 C2 0.1uF R17 10k D1 RB160M-60TR L1 15uH Sumida CDRH3D14/HP-150M LED1+ R1 (OPT) OVP1 12 LED1- R22 1 59K Q1 MMBT3906T 3 3 R18 100K Frequency Adjust 2 1000PF A 2 PWM3 CAP2 19 LED2 18 1 PWM1 28 PWM2 TP8 Q5 MMBT3906T 1 PWM2 1 PVIN 3 CTRL3 TP7 LED3- R24 59K 2 PWM1 LED3D3 RB160M-60TR OVP3 10 5 CTRL1 4 CTRL2 TP6 TP13 LED3- 1 CTRL3 LED3+ LED3+ C8 0.1uF 3 3 CTRL2 0.2 TG3 24 SW3 21 C7 0.1uF TP5 R20 Q6 SI2303BDS 2 3 1 VREF R3 10K CAP3 22 LED3 23 26 SHDN 2 VREF PVIN 2 1 25 VIN SHDN R4 R5 R6 R7 R8 R9 100K 100K 100K 100K 100K 100K CTRL1 LT3496EUFD R19 (OPT) GND 1 U1 JP1 LED3+ TP2 LEDs 2 C1 1uF 50V TP16 VIN ON OFF C10 4.7uF 63V (OPT) 3 1 2 C9 1uF 6.3V 29 GND A VIN 1 GND TP15 + VIN 3V-5.5V PVIN 45V Max TP1 R10 10k B B 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 CONTRACT NO. APPROVALS DRAWN DATE HELEN 8/03/06 Walker Bai 8/03/06 CHECKED TECHNOLOGY TITLE LT3496EUFD, Triple Step-Down LED Driver APPROVED ENGINEER 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 DESIGNER Wednesday, April 18, 2007 2 SIZE CAGE CODE SCALE: FILENAME: DWG NO REV A DC986A SHEET 1 OF 1