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TPS51200的输出VREFOUT问题

Other Parts Discussed in Thread: TPS51200

其中VPP_DDR是2.5V。Vrefout是给DDR的提供参考电平,然后VTT给DDR信号提供端接。

问题是:上电的时候VREFOUT和vo都有如示波器测试的震荡发生,当去掉C3,C5,C6,C7,C8的时候震荡就消失了,不清楚为啥 特地来请教?