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LM5032低压无法启动

Other Parts Discussed in Thread: LM5032

我用LM5032芯片设计了一个反激变换器,输入电压为16-38V,输出为28V/0.5A和5V0.2A,28V过流保护为16V输入时1A保护。可是在16V输入下无法带载0.5A启动,实测0.1A负载依然无法启动,空载启动之后带载正常工作,这是什么原因?