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请问 LM5116 只上电启动一下就没有输出了,是什么原因?

Other Parts Discussed in Thread: LM5116

用LM5116做如下设计:输入为 30~60v,输出为 14v/20A,电路图如下:

不接负载,Vin输入30v,测量Vout,发现每次上电的时候有一下14v输出,然后就没有输出了。请问是何原因?谢谢!