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关于开关电源的诡异情况

诸位专家好,现在用了一片开关电源,输入是5V,输出是3.3V。现在的情况是大多数情况下(90%以上)输出均正常,直流电压为3.303V,纹波也只有16mV。但是偶尔情况下,上电时电压只输出0.45V。这可能是什么导致的呢??谢谢各位!~