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我用的TPS54560,48V转5V,接负载后电压下降是为什么

Other Parts Discussed in Thread: TPS54560, TPS2378

我用的TPS2378做POE供电,50V左右,然后接的TPS54560转5V给开发板供电,开发板已启动电压就跌到3V左右,然后板子就不断重启。启动电流大概1~1.5A吧

我的原理图和布板图都是照官网评估板画的。