A8515高效白光LED驱动电路

A8515是宽输入电压范围高效多输出白光LED(WLED)驱动器,输入电压从5V到40V,最大LED电流120mA,LED电流精度0.5%,LED到LED电流匹配0.5%,集成了60V DMOS开关,可驱动多达12串LED灯(24个LED灯),开关频率高达2.25MHz,PWM调光,主要用在平板LCD屏以及平板视频显示屏。

A8515应用:

• Desktop LCD flat panel displays (FPD)

• Flat panel video displays

• LCD TVs and monitors

图1.A8515功能方框图

图2.A8515典型应用框图

图3.A8515设计案例应用电路图

图4.A8515升压配置应用框图

Typical application showing boost configuration, using current sensing and disconnect switch feature for an input of 12 V with an output to 18 LEDs (9 series LEDs in each of two strings) 120 mA current each LED

图4.A8515 SEPIC配置应用框图