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Converter loop filter with ADP1055

Dear Engineering department,

We are using the ADP1055 on a full bridge power converter.
We have a poor rejection ratio from input to output. The 100Hz ripple present at input is poorly attenuated by the converter.
I try to increase the LF filter gain but the converter rejection remain the same.
Is there any reason why the loop gain at 100Hz couldn't be affected by LF Gain register?