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TPS54620: Vout上电时出现持续抖动,仿真结果也相同,请解释一下原理

Part Number: TPS54620

DCDC刚启动时,VOUT出现了抖动,使用你们的仿真软件也是相同的结果如下图。

请问能否从原理上解释一下原因。

感谢。