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LM5161-Q1: Flybuck non isolated voltage drift with input voltage change

Part Number: LM5161-Q1
Other Parts Discussed in Thread: LM5161


I am working with the LM5161 chip in the flybuck topology. We area using type 3 ripple injection for controlling on and off time for the constant on time control. The issue we are having is that when we sweep input voltage from 16 to 32V, nominal is 28, I am seeing the non isolated supply change from 12.4 to 12.7V.

I would expect this voltage to be held steady at 12.4 (as designed) like I saw in the development board. Has anyone else seen this happen, and if so could you offer some insight as to how to fix it please?