Other Parts Discussed in Thread: UC3854A, UC2855A
Dear TI support,
I have a power supply design that is using the UCC28517. It is specified to operate at 720W within the AC input voltage range of 90Vrms to 175Vrms and 1440W between 176Vrms and 270Vrms. I started out by designing for the low line voltage range (90Vrms - 175Vrms) setting a power limit of 800W. This worked well.
However when increasing the input AC voltage to high line (176Vrms - 270Vrms) the power limit was approximatley 900W. Recognising this power limit is to do with the programming of the multiplier output I have increased the current error amplier resistance to account for the reduced multiplier output current at high line. After this change I now have a power limit of 1600W at high line at the expense of a sloppy power limit at low line (almost 1000W!).
Is it possible to improve the power limit for the two input voltage ranges with their different power limits?
Regards,
Edward