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LT3475EFE-1#PBF

製品説明
仕様・特性

LT3475/LT3475-1 Dual Step-Down 1.5A LED Driver U DESCRIPTIO FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ True Color PWMTM Delivers Constant Color with 3000:1 Dimming Range Wide Input Range: 4V to 36V Operating, 40V Maximum Accurate and Adjustable Control of LED Current from 50mA to 1.5A High Side Current Sense Allows Grounded Cathode LED Operation Open LED (LT3475) and Short Circuit Protection LT3475-1 Drives LED Strings Up to 25V Accurate and Adjustable 200kHz to 2MHz Switching Frequency Anti-Phase Switching Reduces Ripple Uses Small Inductors and Ceramic Capacitors Available in the Compact 20-Lead TSSOP Thermally Enhanced Surface Mount Package The LT®3475/LT3475-1 are dual step-down DC/DC converters designed to operate as a constant-current source. An internal sense resistor monitors the output current allowing accurate current regulation ideal for driving high current LEDs. The high side current sense allows grounded cathode LED operation. High output current accuracy is maintained over a wide current range, from 50mA to 1.5A, allowing a wide dimming range. Unique PWM circuitry allows a dimming range of 3000:1, avoiding the color shift normally associated with LED current dimming. The high switching frequency offers several advantages, permitting the use of small inductors and ceramic capacitors. Small inductors combined with the 20 lead TSSOP surface mount package save space and cost versus alternative solutions. The constant switching frequency combined with low-impedance ceramic capacitors result in low, predictable output ripple. U APPLICATIO S ■ ■ ■ ■ Automotive and Avionic Lighting Architectural Detail Lighting Display Backlighting Constant-Current Sources With its wide input range of 4V to 36V, the LT3475/LT3475-1 regulate a broad array of power sources. A current mode PWM architecture provides fast transient response and cycle-by-cycle current limiting. Frequency foldback and thermal shutdown provide additional protection. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Patents Pending. U TYPICAL APPLICATIO Dual Step-Down 1.5A LED Driver Efficiency VIN 5V TO 36V 4.7μF BOOST2 SW1 10μH 2.2μF 0.1μF 1.5A LED CURRENT 85 SW2 OUT1 LED1 *DIMMING CONTROL OUT2 LED2 PWM1 PWM2 VC1 VC2 REF DIMMING* CONTROL RT VADJ1 24.3k 1.5A LED CURRENT SINGLE WHITE 1.5A LED 75 70 fSW = 600kHz 60 55 3475 TA01 *SEE APPLICATIONS SECTION FOR DETAILS 80 65 2.2μF 0.1μF VADJ2 GND TWO SERIES CONNECTED WHITE 1.5A LEDS 0.22μF LT3475 10μH VIN = 12V 90 EFFICIENCY (%) 0.22μF 95 SHDN VIN BOOST1 0 0.5 1 1.5 LED CURRENT (A) 3475 TA01b 3475fb 1

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LTC

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