Originally Posted by 7500rpm
He is building a brushed speed control, I always build a a separate supply voltage to run the high side this way you have only one FET in the bridge being PWM and the high side turned on hard, more efficient, and less heat from transitioning. Novak reversing controllers were this way and so were Tekin units too.
Is there a name for this separate high-side voltage supply? Charge pump relies on being intermittent, so the high-sides can't be turned on 100% duty cycle.