I want to use the optocoupler FODM452R2 in my design. I want this optocoupler to run as fast as it can (i.e.; work with minimum propagation delay and least rise/fall times). What is the optimum R1, R2 resistor values and magnitudes of V1, V2 voltages?
I know that when BJTs saturate they turn off very slowly, so I have to avoid saturation. I also know that BJTs don't respond fast when the resistor value is too high in common emitter configuration. So there is a trade off. The value of R2 must be chosen in a way to optimize the BJT's switching speed.
Is there an optimum value for R1 as well? Or, is the smaller the better without damaging the LED? On the other hand, does the value of V2 have any effect on the switching performance?
The datasheet doesn't directly answer my question, or the answers are encoded in it in a way I can't understand. It only gives the variation in propagation delay with ambient temperature.