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Opto-coupler usage in TL3844 flyback SMPS

Alejandro Sincich
Prodigy 20 points
Other Parts Discussed in Thread: TL3844, TL431

Hello

please analyse the feedback circuit shown below. It considers disabling the error amplifier (by grounding the FVB input) and controlling its output with the opto-coupler at the 0.5 mA COMP node:

It assumes RA will modulate a control voltage on the COMP node, based in the 0.5 mA current source shown in

Could you please check whether the suggested feedback concept works, or not?

If not, I ask you for the best recommendation regarding pulse width modulation based on a typical TL431-OPTOCOUPLER feedback & TL3844. There is no data about using a TL3844 with TL431 and opto-coupler.

Thanks in advance

Alejandro Sincich