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UC3844 in flyback converter

Dear supporters,

I'm trying to use UC3844 to design a flyback converter. I read datasheet of UC3844. And in this paper, I see the reference design. But I don't understand the Error Amplifier how does it work. And how does it work in combination with current sense?

Would you please to explain or show me some guide papers for me?

I'm looking foward to hearing from you any advises