The LT3755, LT3755-1 and LT3755-2 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 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/LT3755-1/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 analog dimming capability. Applications * High Power LED * Battery Chargers * Accurate Current Limited Voltage Regulators * 3000:1 True Color PWM™ Dimming * Wide Input Voltage Range: 4.5V to 40V * Output Voltage Up to 75V * 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 * Open LED Protection * Programmable Undervoltage Lockout with Hysteresis https://elecena.pl/product/14875494/40v-75v-led-controllers 2018-05-22 https://elecena.pl/product/14875494/40v-75v-led-controllers 2025-01-21