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UCC28251 输入滤波

Other Parts Discussed in Thread: UCC28950

我在这个芯片datasheet第40页的应用电路中看到,输入有一个π型滤波,如图。

这个IC的多个推荐电路中均有这个滤波器,而其他IC比如UCC28950却没有,这个滤波主要起什么作用呢,是否可以不要;或者只留下电容。输入是PFC的输出390V