Hi team,
This is Brandon. met a problem on LM5025 design.
The internal pull-up voltage of the COMP pin of the chip is 5V, and the pull-up resistance is 5kohm.
According to the connection method in the current schematic diagram, the IC current of the optocoupler will be limited to less than 1mA. The optocoupler works normally and the primary IF current is at least It also needs about 0.8mA, so that the loop can work normally, the CTR of the optocoupler is required to be less than 1, and the tolerance of the optocoupler of the CLASSA level cannot meet the demand.
Please help to see if there is a mature external compensation circuit design for reference, thank you!
BR
Brandon.
