We would like to ask your help regarding the customer's inquiry below.
Background: I have used the UCC28704, but there is a problem: I need to reduce the impedance of the signal at Vs (pin 6), but I cannot do this because the impedance is set by the Line Sense Run/Stop Current requirements.
So what I am asking is: are there any PSR flyback controllers that use a different means to sense Vline (ie: do not use the Vs pin). Does there exist a Selection Guide for TIs range of PSR controllers?
Yes, I have read:
SLUA783–October 2016 "Troubleshooting TI PSR Controllers"
There is a very basic selection guide in Section 1 of that document (attached screenshot), but it is not sufficiently comprehensive.