LT3743EUFD#PBF

LINEAR TECHNOLOGY  LT3743EUFD#PBF  发光二极管驱动器, 1输出, 降压逐步下降, 6V-36V输入, 1MHz开关, 34V/20A输出, QFN-28

The is a fixed frequency synchronous step-down DC/DC Controller designed to drive high current LEDs. The average current mode controller will maintain inductor current regulation over a wide output voltage range of 0V to VIN - 2V. LED dimming is achieved through analogue dimming on the CTRL_L, CTRL_H and CTRL_T pins and with PWM dimming on the PWM and CTRL_SEL pins. Through the use of externally switched load capacitors, the LT3743 is capable of changing regulated LED current levels within several µs, providing accurate, high speed PWM dimming between two current levels. The switching frequency is programmable from 200kHz to 1MHz through an external resistor on the RT pin. Additional features include voltage regulation and over-voltage protection set with a voltage divider from the output to the FB pin. Overcurrent protection is provided and set by the CTRL_H pin.

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PWM dimming provides up to 3000:1 dimming ratio

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CTRL_SEL Dimming provides up to 3000:1 dimming ratio between any current

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Three-state current control for colour mixing

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±6% Current regulation accuracy

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Average current mode control

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2µs Maximum recovery time between any current regulation state

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<1µA Shutdown current

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Output voltage regulation and open-LED protection