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UCC28880 inductor effect

ALL,

I have a question about UCC28880EVM-616. I have already do some test use the EVM board. I find an interesting thing when I change the Inductor L2 value.

As we know, if increase the inductor value, the output ripple should be reduce in normal buck converter.

In this case, when I reduce L2 to 470uH and did some test. I found the output ripple in 470uH is more small than the test when the L2= 2.2 uH.

Is it because control algorithm? Or there have other reason?