Tool/software:
Hi, I am planning to use UCC28704 fly back controller for a power supply design with 230VAC as input and 24V and 2 A (48W) as output.
When i gave these specification in WEBENCH, got the attached design. As per this the Rfbt is 120K and Rfbb is 34K. So as per the calculation the current into the VS pin is 21V/(120K+34K) = 136uA which is less than the
Ivsl(run)-220uA. Can you please help in resolving this ambiguity.