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TPS65251 开关频率问题

Other Parts Discussed in Thread: TPS65251

调试TPS65251 

ROSC = 383K

图纸如下:

BUCK1调试   发现输出纹波大,如下图

测量引脚14/15,如下图

开关频率异常,并不是所设定的500KHZ,开关频率问题异常?

将LOW_P 管脚拉高,3路开关电源轻载时工作正常;

请协助解决,感谢!