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TPS23750 BUCK EVM 间断性输出

Other Parts Discussed in Thread: TPS23750

我购买了一块TPS23750 BUCK EVM,然而在测试的时候发现并不能正常工作,下面是示波器测得的output波形以及我使用的POE交换机型号TL-SG1218P

请问下这大概是什么原因导致的?