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UC2825A request advice for error amp circuit solution

richard payne
Genius 4640 points
Other Parts Discussed in Thread: UC2825A, TPS40210, UC2825

Hi

I have worked on UC2825A in long time in the past, way before Unitrode become Ti branch and trying to recall something.

I seen demo circuit in datasheet for VOUT=5V (upto 10 Amp) using non-isolated push pull configuration.

It shown a circuit in error amp, VREF= 5V to pin 2, integrator between Pin 3 and 1 and so on.

I trying to pin down what circuit change within error amp that work when VOUT is 12V or 24V. Do I need to add potential divider or what? 

Modern switching regulator (TPS40210, etc) has simple potential divider, ie VOUT 12V to 2V as part of feedback to controller, but UC2825 is not the same. 

Thanks for helping me to point too right direction. 

R.