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TPS54331负载大于1A,输出电压就下降!

Other Parts Discussed in Thread: TPS54331

现在使用TPS54331过程中遇到负载电流大于1A的情况下 输出电压就会低于4.5v ,负载越大电压越低。电流小于1A的时候电压稳定在4.5v,不知道是什么原因