摘要
基于芯片AP3706设计了一款反激式开关电源,用于驱动LED。在电路中使用较少的元件,达到恒流的效果。由于AP3706采用了PFM(脉冲频率调制)来实现DCM(非连续导通模式),所以变压器的设计不同于PWM(脉冲宽度调制)模式。在文中对这种变压器进行设计与计算,并制作出7 W的实际电路。
Flyback switch mode power supply is designed based on AP3706. It has used less components and can output constant current to drive LED.AP3706 uses Pulse Frequency Modulation (PFM) method to realize Discontinuous Conduction Mode (DCM).So the design steps of the transformer for PFM are also different from that of PWM Mode. Design steps focus on the transformer design and calculation. Then realized electrocircuit that can output 7 watt.
出处
《电子设计工程》
2011年第21期112-114,共3页
Electronic Design Engineering
基金
广东省大学生创新实验项目(1134910025)
2011年度江门市财政科技专项资金计划项目[江财Ⅰ[2011]131]
关键词
开关电源
LED
PFM
变压器
switch mode power supply
LED
PFM
transformer