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TPS40210接负载时输出电压不正常

Other Parts Discussed in Thread: TPS40210

您好,在使用TPS40210实现5V转12V升压功能时,上电后TPS40210空载时输出电压正常为12V;当接入负载时输出电压变为了4.9V左右,其中负载工作电压为12V电流约为2A,原理图参考WEBENCH设计如下,想请问这是什么原因导致的呢?谢谢。