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TPS23753: 应用问题

Part Number: TPS23753


不接PSE的情况下,只接外部12V适配器,不接负载时上电输出电压是正常12V。但是接上负载时上电,输出电压只有2.4V。是什么原因?谢谢!

备注:不接负载时上电输出电压是正常12V,此时再接负载输出电压还是正常的12V.