Re: Stepper driver
Walt:
The above schematic is for a stepper motor, not 3 phases DC brushless.
The one I uploaded is for 3 phases DC Brushless.
In case of a 3 phases brushless DC motor the current control is generally control on each phase switching. So as soon as the the set value (motor dependant) is reach, the switch is then turned off.
As far as the pair of FETs is concerned, I used the lowest RDS on I can place my hands on. Price difference between a very low RDS on an a medium one is not that great anyway. To select a pair use tree search by function (onsemi)
Cheers