I am designing the PFC with a hiperpfs-3, the problem i have is you require an auxiliary power supply of 12v on vcc, do you have a circuit? or just add a resistor and a cap between the diode bridge BR1 and the inductor L1? What is the current required?
I am looking at using the linkswitch-xt, but maybe that will affect the power factor control in a negative way. Any suggestions for the 12 V supply?