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电源要求是：电源设计：输入400-700V，输出15V(+-1.5v) 0.1A和5V(+-0.5V) 50nA，
如果是需要隔离，请教是否可以按照PMP8688的设计（LM5021)，经过修改以适应800V的高压输入，次级侧使用TL431和光耦反馈电路？下面是PMP8688的电路
亲，建议用ZVS反激。你的电路损耗太大。
