UCC28061-Q1: Phase Shift of GDA Relative to GDB - Degrees in case of AC100V and AC200V

Hi all

Would you mind if we ask UCC28061-Q1?

Our customer measured the phase shift as follows input condtions;
<AC input condtions>
100V(85V～132V)   ： 176～180 degree(it seems OK.)
200V(168V～264V) ： 183～200 degree(it seems that there is difference.)

In case of 200V, there is big difference(tolerance) compared with AC=100V. 

<Question1>
Does the phase shift between GDA and GDB depend on AC-input?

<Question2>
We guess that it relation to "Phase B to phase A on-time matching".
We get the tips on another forum as follows;
"For design purposes gate drive GDA is the same pulse width as GDB but in real world parts there is a 6% tolerance in these gate drive widths."
Does its tolerance of pulse width affect to phase shift?

We need your help.

Kind regards,

Hirotaka Matsumoto