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UCC2818AQDRQ1- PFC correction boost strap inductor design issue

PARTHIBAN V
Prodigy 190 points

Hi,
        I am using Ic -UCC2818AQDRQ1 for 85Vac to 265Vac PFC correction.During inductor designing i got doubt in the bootstrap
winding of the inductor.
 AC input voltage  85Vac rectifier output is 76.5Vdc output.I designed to bootstrap winding 76Vdc to 15Vdc for give UCC2818AQDRQ1-VCC voltage. suppose this same bootstrap winding will be used in the 238Vdc (265Vac rectified to 238Vdc)means bootstrap winding output voltage >18V. Please provide the design guide
lines to design bootstrap winding of the inductor 85Vdc to 230Vdc.

Thanks 

parthiban