It's time to dump the L298Ns.
I'd like to build a quad H bridge driver that will work for the little yellow 6V TT motors, but also work later with 3 amp motors up to 30V.
I've found a nice IC that I'd like to use:
And @LarryD posted a fantastic resource:
For a reversible PWM MOSFET based H bridge the bottom center and the bottom right circuits should both due, but I have questions:
- Have I selected an IC that will work for my requirements?
- What is the advantage of the 2 pin or the 4 pin design? That is to ask, do you gain more control by controlling the N-MOSes directly?
- If the 4 pins is better, don't you only need to control one ore the other N-MOS at a time so couldn't those be flip-flopped onto the same pin? Low, High, and Input for all off?
- I looked at Pololu and found the 2520 it's comparable but expensive. Is this the least expensive model with these specs that's worth looking at?
- I do not see radio caps on the schematic above. Aren't they required for using an H bridge with PWM as a motor driver? I see them on every module, that's why I ask.
- Are there any other discrete components or supporting circuitry that I've missed?