Linear LT3760 8路LED驱动方案

Linear 公司的LT3760是集成了升压DC/DC控制器的 8路LED驱动器,能驱动高达45V的LED. 输入电压从6V 到 40V,40mA时的LED匹配电流为±2%,典型值为±0.7%,调光比高达3000:1,可编程的频率从100kHz到1MHz,主要用于汽车,笔记本低电脑和TV监视器的背光.本文介绍LT3760主要特性, 方框图, 36W, 28W, 15W,29W,25W以及14W LED驱动器应用电路.

The LTR3760 is an 8-channel LED driver with a step-up DC/DC controller capable of driving up to 45V of LEDs.

Each channel contains an accurate current sink with ±2% current matching. Channels follow a master programmable current to allow between 20mA to 100mA of LED current per string. Channels can be paralleled for higher LED current. Output voltage adapts to variations in LED VF for optimum efficiency and open LED faults do not affect the operation of connected LED strings.

The LT3760 allows a PWM dimming range up to 3000:1 and an analog dimming range up to 25:1. Operating frequency can be programmed from 100kHz up to 1MHz using a single resistor or synchronized to an external clock.
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