Analogic AAT1451平板电脑高效白光LED驱动方案

Analogic公司的AAT1451是四路高集成高效白光LED驱动器,主要用于笔记本电脑,上网本,监视器和手提TV的LCD背光的LED驱动.器件的输入电压从5V到26V,可从DC,点烟适配器或多个锂电池输入,集成的升压转换器提供高达50V的输出,每串LED电流高达30mA可编程,120mA总输出电流可驱动多达481个LED.效率高达93%,主要用在监视器, 笔记本和上网本电脑,手提DVD播放器,手提TV和白光LED背光.本文介绍了AAT1451主要特性, 方框图, 典型应用电路图以及评估板电路图和材料清单, PCB布局图.

AAT1451 | Four LED Strings–High Efficiency White LED Driver for LCD Backlighting

The AAT1451 is a highly integrated, high efficiency LED backlight solution for notebook, netbook computers, monitors and portable TVs. The device operates from DC inputs, cigarette adapters or multi-cell Li-ion batteries in the voltage range from 5V to 26V.

An integrated boost (step-up) converter provides a high voltage output up to 50V for driving series LEDs. Four precision current sinks are programmable up to 30mA per string through one external RSET resistor, supporting up to 481 white LEDs at 120mA total output current.
..

查看全文