Other Parts Discussed in Thread: UCC28070, UCC28056, UCC28065
What happens if the maximum load at the output of the PFC converter is exceeded and the output voltage falls below the peak voltage of the input voltage?
Specifications::
Input: 90 to 265Vac
Output: 390Vdc / 450W
How does the controller behave when 240Vac is present and the 450W is exceeded. So the output voltage falls below the peak value of 240Vac * SQR (2) = 340Vdc due to the power limitation? In this case, current is drawn through the PFC choke in a pulsed manner via the diode at 100Hz and the chocke goes into saturation! Would that mean that the current in the PFC-FET would increase exponentially and lead to its destruction? Is the controller overcurrent shutdown fast enough? The whole thing will repeat itself every 100Hz.
I expect that I don't get a power limiting with increasing the line voltage, is that right? So I have power limiting at the lowest line voltgae only through the current limiting function? To get a power limiting the should be used a controller that also works with the input RMS voltage, is that right?
