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CCS/UCD3138HSFBEVM-029: The problem of output voltage ripple

Part Number: UCD3138HSFBEVM-029

Tool/software: Code Composer Studio

Hi,

When I used UCD3138HSFBEVM-029 to watch the output ripple,I found difference between TI's and ours.

My output voltage ripple is like this:

However,the ripple in Using the UCD3138HSFBEVM-029 is more smooth:

The peak to peak value(26.4mV) is right.I just wanna know how to smooth it!