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XTR115: TXR115 5V voltage ripple and loop current ripple

Part Number: XTR115
Other Parts Discussed in Thread: XTR117, XTR116

Hi team,

My customer is using the XTR115 now and meet the issue below. We find when Vreg-5v load changed with 300-500uA, the 5V also has 20~30mv voltage change ripple which will cause the loop current has 30uA current ripple. It's not acceptable for two line system. Do you have some ideas about the reasons and the solutions to solve it? Thanks.

1) we have changed the C1 to 67uF with add 66uF more cap, with no help.

2) When loop current below 10mA, the ripple is obvious, when the loop current is above 12mA, no ripple. 

5V voltage