we made der296 highly accurate constant current dimmable non isolated driver and it is working absolute fine. Now we need a same driver with isolation. We are working on it and trying to implement the isolation with optocoupler. But how dimming can be incorporated with Optocoupler? I understand that D7 (in der296 ) is reverse biased and disengages U2 during dimming. Please explain how this function can be implemented in an isolated circuit with optocoupler. Kindly guide us.