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UCC2893 方案的开关电源

Other Parts Discussed in Thread: UCC2893

大家好:

             在市面上,看到有开关电源(使用Ucc2893),100-240Vac输入后,经过桥堆整流后不用大电解(只有一个1uF的的电容)滤波 (电源有500W),只有一个变压 器。想知道是怎么做到的,使用了什么技术,想学习学习。

谢谢