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TPS23750隔离电源变压器后端电路作用

Other Parts Discussed in Thread: TPS23750

大拿们

TPS23750做flyback,如果反馈加光耦做隔离,后端电路必须加上这个 ,如果不用光耦做隔离,是不需要的。请问下这个电路的作用是什么。如果反馈用光耦隔离了,必须加后端电路吗?谢谢