LED低压驱动电源——DC/DC升压变换器(上)

A Type of Low Voltage LED Driver With DC/DC Step up Converter(Ⅰ)

介绍了两种用DC/DC升压变换器驱动LED的电路,对电路的工作情况进行了详细分析,推导了输出电压与输入电压的关系,并以占空比D表示。最后给出一些芯片实例。

Two types of low voltage LED drivers with DC/DC step up converters are introduced and the operation modes of the circuits are analyzed in detail.The relationship between output voltage and input DC voltage is deduced in terms of duty ratio.In the end several IC chips adopting those circuits are cited.