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TLV62585: TLV62585 Reduce the ripple for PSM mode when output is 4V

Part Number: TLV62585
Other Parts Discussed in Thread: TLV62565,

Hi Team, 

My customer is doing a design with TLV62565, input is 4.5-5V, output is 4V.

When testing with light loading on the TLV62565 EVM, it was found that the ripple is very large. 

According to the datasheet, it was recommended that a feed forward capacitor should be used to reduce the ripple. 

A 22uf capacitor is recommended for 1.8V output. 

So my question is that for my customers' design, the output is 4V, Should I choose a larger value capacitor or a little one as the feed forward capacitor? Now we're doing test on the EVM, the L = 1uH, C2=22uF, R1= 200K, R2 was changed to 39K from 100K in order to get the 4V output.