johnwasser:
If the current-sinking PWM driver you like has open-collector (or open-drain) outputs you can use pull-up resistors (to 5V) to turn those output into 5V logic outputs. When the output is off the pull-up resistor will take the signal HIGH. When the output is on it will pull the signal LOW.
That sounds like a great solution, how do I work out the optimum pull-up value?
retrolefty:
Do you have a datasheet or link to that CCR2 device? Most constant current driver devices have active outputs and would not work the way you are attempting to PWM it.Lefty
The circuit is taken from the figure 11 in the datasheet: http://www.onsemi.com/pub_link/Collateral/NSI50350AS-D.PDF