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LM5017 , 副边光耦反馈 ,8V输入时3.3 /5V/6V 1W满载输出正常, 42Vin 输入时5V/6V 1W满载输出低

Other Parts Discussed in Thread: LM5017

LM5017 , 副边光耦反馈 ,8V输入时3.3 /5V/6V 1W满载输出正常, 12V至42Vin 输入时5V/6V 1W满载输出低 ,是怎么回事 ?