I'm trying to build an H bridge to rapidly toggle between a variable voltage from 0 to ±30v.
When I look online for pre-built motor controllers, the lowest voltage they go is around 1v.
This is strange because when I look at a simple four chip MOSFET H bridge design, I don't see any reason why there should be a lower limit on the voltage that actually hits the motor? I understand there needs to be a minimal voltage to activate the MOSFET.
Four of these chips (863-NDDL01N60Z-1G) should be able to achieve a similar effect, but lets you get low voltage across the "motor" terminal?
Why can't these shields output a small voltage across the motor? For example, 0.2v?