LED低压驱动电源——DC/DC降压变换器(上)  

The Low Voltage LED Drivers with DC/DC Step Down Converters(Ⅰ)

作　　者：陈传虞 

出　　处：《中国照明电器》2011年第7期14-18,共5页China Light & Lighting

摘　　要：详细分析了DC/DC降压变换器驱动LED电路的工作原理,并推导了输出电压与输入电压的关系和电路参数选择依据的公式;给出一种DC/DC降压变换器芯片实例及其实用电路。The low voltage LED drivers with DC/DC between output voltage, input DC voltage, the formulas typical step down converter IC and its practical circuit step down converters are analyzed in detail. The relationship used to determine the circuit parameters are derived. At last a are introduced.

关 键 词：DC/DC降压变换器 连续导通模式(CCM) 断续导通模式(DCM) 占空比 隔离电源 

分 类 号：TM46[电气工程—电器]