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我用ucc28710做的DC-DC的CS信号为啥振荡啊?

Other Parts Discussed in Thread: PMP8583

原理图,如图所示。

我发现脉冲太窄于是将采样电阻R21改为0.1OHM。

变压器是P12圈52uH,S300圈。

发现CS信号振荡。

CS振荡什么原因呢?会不会是CS振荡导致DRV三个脉冲后关闭?

附注:VS信号是直接从S测量的电压信号,被2M/30k电阻分压后就是真正的VS信号。

因为VDD是24V直接输入,所以没有给出VDD的信号。