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LM5176无法连续工作,如一直处于打嗝模式

Other Parts Discussed in Thread: LM5176

我用LM5176设计的一个100W升降压DCDC,输入9~15V,输出5V。发现在空载或者0~4A带载,都无法正常连续工作,电感有高噪音,并发热严重。从全桥前端电感波型以及MOS驱动波形可见,LM5176工作于DCM模式。不知是什么原因导致的。

下图是11V输入,5V/1A输出时,全桥前端电感的电压波形。