I am using the TOP264 and copying the DER-237 reference design. This uses a 9.6V bias winding voltage with an optocoupler to provide feedback to the CONTROL pin.
Can I use a transformer with a higher bias winding turns ratio and therefore have a bias voltage of 16V? Will this cause any problems to the CONTROL pin which has absolute maximum voltage of 9V?
I think that the bias voltage will be dropped across the optocoupler and so the CONTROL voltage will be much lower than the bias voltage. Is this correct?