Datasheet LT3956 (Analog Devices) - 20

LT3956 Typical applicaTion
Buck Mode 1A LED Driver with High Dimming Ratio and Open LED Reporting Efficiency vs VIN
VIN 24V TO 100 80V C2 1M VIN ISP 200k 200k 4.7µF EN/UVLO 750Ω 0.1Ω s 1A 200k 96 61.9k Q2 ISN FB 92 V M1 20k REF 30.1k PWMOUT Q1 88 CTRL 6 WHITE LEDs EFFICIENCY (%) LT3956 20W 10k 1k 84 INTVCC L1 100k 33µH 8020 30 50 70 80 VMODE SW 40 60 D1 VIN (V) PWM VIN 3956 TA06b SS C1 0.1µF RT 1µF 28.7k VC GND INTVCC PGND s 375kHz 47k INTVCC D1: DIODES INC B1100/B 2.2nF 4.7µF L1: WÜRTH 74456133 M1: VISHAY SILICONIX Si5435BDC Q1: ZETEX FMMT493 3956 TA07a Q2: ZETEX FMMT593 C1: TDKC3226X7R2A105K C2: TDKC3225X7RIE475K relaTeD parTs
PART NUMBER DESCRIPTION COMMENTS
LT3756/LT3756-1/ 100VIN, 100VOUT, Full Featured LED Controller VIN: 6V to 100V, VOUT(MAX) = 100V, True Color PWM Dimming = 3000:1, LT3756-2 ISD < 1µA, 3mm × 3mm QFN-16 and MS16E Packages LT3755/LT3755-1/ 40VIN, 75VOUT, Full Featured LED Controller VIN: 4.5V to 40V, VOUT(MAX) = 60V, True Color PWM Dimming = 3000:1, LT3755-2 ISD < 1µA, 3mm × 3mm QFN-16 and MS16E Packages LT3474 36V, 1A (ILED), 2MHz, Step-Down LED Driver VIN: 4V to 36V, VOUT(MAX) = 13.5V, True Color PWM Dimming = 400:1, ISD < 1µA, TSSOP16E Package LT3475 Dual 1.5A (ILED), 36V, 2MHz Step-Down LED Driver VIN: 4V to 36V, VOUT(MAX) = 13.5V, True Color PWM Dimming = 3000:1, ISD < 1µA, TSSOP20E Package LT3476 Quad Output 1.5A, 36V, 2MHz High Current LED Driver VIN: 2.8V to 16V, VOUT(MAX) = 36V, True Color PWM Dimming = 1000:1, with 1000:1 Dimming ISD < 10µA, 5mm × 7mm QFN Package LT3477 3A, 42V, 3MHz Boost, Buck-Boost, Buck LED Driver VIN: 2.5V to 25V, VOUT(MAX) = 40V, Dimming = Analog/PWM, ISD < 1µA, QFN and TSSOP20E Packages LT3478/LT3478-1 4.5A, 42V, 2.5MHz High Current LED Driver with VIN: 2.8V to 36V, VOUT(MAX) = 42V, True Color PWM Dimming = 3000:1, 3000:1 Dimming ISD < 3µA, TSSOP16E Package 3956f 0 Linear Technology Corporation LT 0510 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2010 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration order information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Application Package Description Typical Application Related Parts