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DO1606T-472 Datasheet(PDF) 1 Page - Linear Technology |
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DO1606T-472 Datasheet(HTML) 1 Page - Linear Technology |
1 / 20 page LT3474/LT3474-1 1 3474fd The LT®3474/LT3474-1 are fixed frequency step-down DC/DC converters designed to operate as constant-current sources. An internal sense resistor monitors the output current allowing accurate current regulation, ideal for driving high current LEDs. High output current accuracy is maintained over a wide current range, from 35mA to 1A, allowing a wide dimming range. Unique PWM circuitry allows a dimming range of 400:1, 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 capaci- tors. Small inductors combined with the 16-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. With their wide input range of 4V to 36V, the LT3474/ LT3474-1 regulate a broad array of power sources, from 5V logic rails to unregulated wall transformers, lead acid batteries and distributed power supplies. A current mode PWM architecture provides fast transient response and cycle-by-cycle current limiting. Frequency foldback and thermal shutdown provide additional protection. ■ Automotive and Avionic Lighting ■ Architectural Detail Lighting ■ Display Backlighting ■ Constant Current Sources n True Color PWM™ Delivers Constant Color with 400:1 Dimming Range n Wide Input Range: 4V to 36V n Up to 1A LED Current n Adjustable 200kHz–2MHz Switching Frequency n Adjustable Control of LED Current n Integrated Boost Diode n High Output Current Accuracy is Maintained Over a Wide Range from 35mA to 1A n Open LED (LT3474) and Short-Circuit Protection n High Side Sense Allows Grounded Cathode Connection n Uses Small Inductors and Ceramic Capacitors n LT3474-1 Drives LED Strings Up to 26V n Compact 16-Lead TSSOP Thermally Enhanced Surface Mount Package TYPICAL APPLICATION DESCRIPTION Step-Down 1A LED Driver Step-Down 1A LED Driver L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. True Color PWM is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Patent Pending FEATURES APPLICATIONS Efficiency VIN BIAS OUT PWM LED LED1 DIMMING* CONTROL LT3474 0.1μF VIN 5V TO 36V 2.2μF 0.22μF 10μH 3474 TA01a 80.6k *SEE APPLICATIONS SECTION FOR DETAILS SHDN REF BOOST SW VADJ RT VC GND 2.2μF LED CURRENT (mA) 0 70 75 80 600 1000 3474 G02 65 60 55 200 400 800 85 90 95 TWO SERIES CONNECTED WHITE 1A LEDS ONE WHITE 1A LED VIN = 12V |
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