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TPS62135: 电源输出不正常

Part Number: TPS62135

您好,TPS62135这颗芯片的输出只有0.27V,且FB引脚的电压只有0.1V左右,SS引脚的电压为0V,EN电压电压经过测试为4.96V,除此之外,我还使用了2颗TPS62135,电源输出均不正常,情况和这颗芯片基本无差别,那么可能是什么原因导致的这个问题?