LT3755EMSE-2#PBF

LINEAR TECHNOLOGY  LT3755EMSE-2#PBF  发光二极管驱动器, 1输出, 升压, 降压, 降压-升压, 4.5V-40V输入, 1MHz开关, 75V/1A输出, MSOP-16

The is a LED Controller designed to operate as a constant-current source for driving high current LEDs. It drives a low side external N-channel power MOSFET from an internal regulated 7.15V supply. The fixed frequency, current mode architecture results in stable operation over a wide range of supply and output voltages. A ground referenced voltage FB pin serves as the input for several LED protection features and also makes it possible for the converter to operate as a constant-voltage source. A frequency adjust pin allows the user to program the frequency from 100kHz to 1MHz to optimize efficiency, performance or external component size. The LT3755-2 sense output current at the high side of the LED string. High side current sensing is the most flexible scheme for driving LEDs, allowing boost, buck mode or buck-boost mode configuration. The PWM input provides LED dimming ratios of up to 3000:1 and the CTRL input provides additional analogue dimming capability.

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3000:1 True colour PWM™ dimming

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Constant-current and constant-voltage regulation

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100mV High-side current sense

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Drives LEDs in boost, buck mode, buck-boost mode, SEPIC or Flyback topology

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100kHz to 1MHz Adjustable frequency

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Open LED protection

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Programmable under-voltage lockout with hysteresis

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Improved open LED status pin

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PWM disconnect switch driver

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CTRL pin provides analogue dimming

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Low shutdown current <1µA

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Programmable soft-start