Maxim MAX16838双路LED驱动方案

Maxim公司的MAX16838是集成了DC/DC开关升压转换器和两个150mA电流沉的双路LED驱动器,输入电压4.75V到40V,升压或SEPIC电源配置,200Hz的PWM调光比为5000:1,具有漏极开路故障指示输出以及LED开路/短路检测和保护,输出过压和超温保护,主要用在汽车显示器背光,汽车照明和LCD显示器背光.本文介绍了MAX16838主要特性, 方框图和升压-降压配置框图, SEPIC配置框图, 典型应用电路图以及MAX16838评估板主要特性,电路图,材料清单和PCB布局图.

The MAX16838 is a dual-channel LED driver that integrates both the DC-DC switching boost regulator and two 150mA current sinks. A current-mode switching DC-DC controller provides the necessary voltage to both strings of HB LEDs. The MAX16838 accepts a wide 4.75V to 40V input voltage range and directly withstands automotive load-dump events. For a 5V ±10% input voltage, connect VIN to VCC. The wide input range allows powering HB LEDs for small-to-medium-sized LCD displays in automotive and display backlight applications.
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