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LM2587怎样改为用TL431和PC817的隔离电源?

Other Parts Discussed in Thread: LM2587, TL431, LM3411

请问大家:

我有一个根据LM2587手册做的一个DC-DC电源,是24V转正负12V的,但不是隔离的,我想加PC817和TL431把他改为隔离电源,请问如何进行?