>Anybody have any suggestions? With all the switching power supply IC's out
>there, someone must have used them for this purpose.

Do you need separate sources?
Is this a unipolar or a bipolar motor?

Current chopping isn't real hard, you can let the motor itself play a role,
and just use a simple transistor circuit for unipolar drive.

There probably exist 5A chopped driver ICs as well, like a beefy version of
the PBL3717, but I don't know part numbers.

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