@f3ad697a One last thing I can imagine would be that when the three loads have different voltage drop, like RGB LEDs, then while the PWM is turned off, I can see some of the body diodes potentially be forward-biased momentarily. At PWM speeds below RF that shouldn't matter though. 

 @7f73a7d1 in this case they're all the same LED, so should be fine, but that is a good point.