I am studying a design of a fly back DC-DC converter. It is based on TL431 voltage regulator with PC817 opto-coupler. I heard that it is a popular design used. Switching PWM pulses are generated using UCC2813-1 IC. I know how the circuit is supposed to behave. However I could not understand the exact way in which UCC2813-1 operates.
I have seen its data sheet and know how pins behave individually. Can you please explain the function of pins relating one to other like the relation between REF and RC, COMP and REF, CS and COMP and how they effect overall function of IC.
I also couldn't understand the comparator symbol used for 'error amplifier' to which FB pin is connecting (inverting input) - comparator with arrow symbol in block diagram in RED square. what does arrow indicate?