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SN6501做的隔离电源不能带负载,有什么可能的原因?

Other Parts Discussed in Thread: SN6501

我欧诺个SN6501做的隔离电源,负载电流与原边电流严重不成比例,负载2.5mA时原边已经超过100mA了。空载时也有12mA。

我的电路是5V入,过变压器后全桥整流输出±6V的方式。变压器使用的是TMG-340系列,变比1:1.33的,这个系列的V-us都在12-18以上了,会是SN6501买到假货了吗?