一种两级式 LED 恒流驱动电源设计

摘要

According to the design requirements of LED Current drirer,this design plan for a reasonable argument.The first stage power of factor correction adopted boost chopper circuit and its control chip is Fairchild's FAN7527.Isolated sin-gle-ended flyback circuit buck type DC/DC converter was used as the second stage and its controller chips is TI's UC3843.In addition,to meet the output characteristics of constant current ,AP4310 was designed as constant current controller.Based on the above structure,experimental prototype of LED driver was realized.Through testing and analysis,experimental waveforms were consistent with the theoretical waveform and the proposed LED driver meets the design requirements.%根据 LED 驱动电源设计要求,对设计方案进行合理论证,前级功率因素校正采用升压型斩波电路,控制芯片采用仙童公司的 FAN7527,后级采用隔离式单端反激电路实现降压型 DC/DC 变换,控制芯片为 TI 公司的 UC3843；此外为满足 LED 驱动电源恒流输出特性,设计中采用 AP4310设计一个恒流限压控制器。基于以上结构,完成一款实验样机,通过测试和分析,实验波形与理论波形基本一致,完成本次设计要求的性能指标。