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用UC3842做降压PFC只能降到100V吗?

Other Parts Discussed in Thread: UC3842, UCC29910A

最近用UC3842做一个降压PFC,原来打算降到70V-80V左右,但现在只降到100V到120V之间,再怎么也降不下去了,请问这种降压电路理论能降到多少V呢?谢谢。