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TPS53015: 输出是正常的5v输出,但是使用电子负载定电流,将负载调到7A时候,电压掉到了4.3V,负载调整率差的问题,请问可以如何解决

Part Number: TPS53015

以上这是原理图,请问是有什么设计上的问题吗