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用TPS62173芯片将12v直流电转化为5v的电路的输出电压不为5,输出固定为10v,且使能端不起作用,求大神指教

这个是电路原理图,现在不管我给不给使能端12v的电压,输出电压(不带负载的情况下)都不会发生变化,稳定在10v左右,输出并不是5v,SW管脚的波形图如下