Hi,
We are using UCC2808A for our isolated power supply design, but datasheet doesn't have much info on designing. Have some of following doubts:
Q1. for type-II compensator across TL431, what decides the frequency of poles and zero ?
Q2. Assuming cross-over frequency as 1/10th of converter's switching frequency, how far is it correct to consider.
Q3. there's no pull-up Resistor provided from NPN Photo-transistor (Pin#5 of H11A1) to Vdd, where as most of TI application note has included it.
Q4. Compensation loop across COMP-FB pin, current sense circuit.
Any assistance on above queries will be very kind and helpful of you.
Thanks & Regards,
Varun Jaiswal