Part Number:UCC28070
Dear TI friends:
I have a technial question of PCF IC, please help solve it; Below are details situstion;
we developed 1.5kW PFC circuit, Uusage UCC28070, input voltage is: 85VAC to 265VAC, output voltage is 360VDC; for Vinac pin and Vsense pin parameter configuration, according to UCC28070 datasheet, this two pin must keep voltage divider ratio same; thus, for meet output voltage is 360VDC, the two pin ratio is K=3/360=12k/(12k+1428k)=0.008333 , according to datasheet, the Vinac and Vsense voltage typical is 3V, if refer to 0.008333, Vinac will only detect 85vac to 255vac, if cover to 265VAC, then the Vinac will reach to 3.5V, so over to the typical, can you tell me taht if over the 3V, the circuit ahether can normal working? other, can you suggest how to set he ratio for the two pin?
Thank you!