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TPS23753A: POE电路设计5V输出,有负载时输出不正常,无负载时输出正常

Part Number: TPS23753A

设计POE输出5V,无负载时,5V输出正常,加上负载后,5V有震荡震荡赋值为2.64V,影响电路输出。请问这是什么原因????以下是电路图设计