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tps53318想做8A的应用。能帮我看看layout吗

现在在5v以下可以输出大电流,但是负载小于4欧姆的情况下,输入电压只要大于5v,芯片就关机,这是什么原因啊?电感值为1uH,额定电流12A,看看layout有问题吗?