Evaluating UCC28C44 as a PSR Flyback Controller
Have some questions
I did not use the current mode control (no current sense resistor) to be coherent with an other source for flyback controller used and the regulation is not as expected. I want to be sure that the reason is not this choice. Can you tell me if this current mode control is required in PSR configuration ? Voltage mode control is approached in UCC28C44 datasheet but not in the application note that you sent to me. I just want to be sure that is possible.
The problem I face here is a dramatic voltage drop on SEC winding when the current demand increase. I know that controller in PSR configuration has no possibility to see SEC winding output voltage so this voltage drop cannot be regulated by the controller in my case but is it possible if the current sense mode is used ? Is the choice of voltage mode control the origin of the problem ?
Thank you for your help
Calex
