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望能对电路设计及相关参数给予分析
楼主这个问题有点大，你对原理图中哪一部分有疑问，可以提出来讨论一下。
what is your question about this UCC28810?
It is single stage PFC Flyback converter.
估计楼主是对次级运放限压限流双环那块不是很清晰··
