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LMR62014空载时候输入输出电压正常,带1A左右的LCD时候,输入电压被拉低?

Other Parts Discussed in Thread: LMR62014

大佬好,请教下,在使用LMR62014升压dcdc时候,输入Vin=4.2V,输出Vout=5V:

1、当空载的时候输入输出正常;

2、当带负载时候,Vin被拉低到了3.7v左右(输入电流在1.5A),输出电压正常5V;

 知道是什么原因?