Discrete-FET stepper driver

Does anyone (other than me, obviously) have any interest in a stepper motor driver built with discrete FETs?

It would have the advantage of being able to use powerful FETs and higher drive voltages. It has the disadvantage of complexity, and it wouldn't be practical to use a step/direction input; instead it would use 2x analog inputs (either PWM or DAC).

I'll post schematics some time soon if anyone is interested.

The Allegro A4989 chip would allow you to do this.

A4989

That's a very interesting device, but I don't think it will suit my requirments. I also want to get away from step/direction. What I would like to do, ideally, is to periodically output a step-angle, which the stepper driver will interpret.

How about a3985 ? i think its interesting device.

Hey, that A3985 looks pretty nice. Close enough to prototype my idea, anyway!

Thanks for the pointer!