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TPS62135: 电源输出不正常

Part Number: TPS62135


你好,TPS62135这颗芯片的使能引脚是由上一级的PG引脚使能的,上一级的PG引脚上拉到了5V,为什么测出来的电压只有0.27V,且FB处的电压只有0.1V左右,SS引脚的电压为0V,我的板卡上一共使用了3颗这个芯片,这3颗电源都是一样的情况,请问这可能是什么原因导致的?