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UCD3138: Questions of DAC_VALUE

Part Number: UCD3138

Hi Experts,

We have a  high voltage dc model server power , we want that there is no duty output during  DC 378V input because we want the meter of  AC source keeps stable,  pfc just bypass for this moment ,

We have a idea that set EADCDAC to 0,it would cause current loop error to negative and clamped duty to 0 by yn_clam_low.

we found that there is no duty output when EAP pin needs 0.015V at least on open socket board,can you tell me why?(0.015V is internal offset ?) or did I miss something?

Pls give some suggestions for this purpose  ,thanks.