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Hi
You can find a lot of documentation on this kind of circuitry on the internet.
You have basically to compare your feedback signal to a triangular waveform with a comparator, to generate the PWM.
Find examples for buck converters there, that you will have to adapt to your flyback dc-dc topology
https://www.ee.bgu.ac.il/~pel/presentation/PET06/PET06.pdf
Good luck
Can anyone teach me how to construct the PWM controller in the first post without any MCUs?