Linear LT3756高压100V 大电流LED驱动方案

Linear公司的LTR3756, LT3756-1和LT3756-2 是驱动大电流LED的DC/DC控制器,输入电压力V-100V,输出电压高达100V,PWM调3000:1,恒流和恒压稳压,可调频率100kHz到1MHz,能以升压,降压,升-降模式,SEPIC或反激拓扑驱动LED,主要用于大功率LED应用,限流恒压应用和电池充电.本文介绍了LT3756主要特性,方框图,多种LED驱动应用电路,以及评估板1319B-A/1319B-B主要特性,电路图和材料清单.

The LTR3756, LT3756-1 and LT3756-2 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 LT3756/LT3756-1/LT3756-2 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.
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