Features: 3000:1 True Color PWMTM DimmingWide Input Voltage Range: 6V to 100VOutput Voltage Up to 100V Constant-Current and Constant-Voltage Regulation 100mV High Side Current Sense Drives LEDs in Boost, Buck Mode, Buck-Boost Mode, SEPIC or Flyback Topology Adjustable Frequency: 100kHz to 1MHz Ope...
LT3756-1: Features: 3000:1 True Color PWMTM DimmingWide Input Voltage Range: 6V to 100VOutput Voltage Up to 100V Constant-Current and Constant-Voltage Regulation 100mV High Side Current Sense Drives LEDs in B...
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The LT®3756 and LT3756-1 are DC/DC controllers designed to operate as a constant-current source for driving high current LEDs. They drive a low side external N-channel power MOSFET from an internal regulated 7V supply. The fi xed 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 effi ciency, performance or external component size.
The LT3756/LT3756-1 sense output current at the high side of the LED string. High side current sensing is the most fl exible scheme for driving LEDs, allowing boost, buck mode or buck-boost mode confi guration. The PWM input provides LED dimming ratios of up to 3000:1, and the CTRL input provides additional analog dimming capability.
Both parts are available in the 16-lead QFN (3mm × 3mm) and MSOP packages.