Since you can't supply the full 4A of the parallel winding, you would probably be best served by using half coil wiring. When using half coil you would normally set the current to the unipolar rating, but your driver is limited to 2.5A so you would set it no more than that. It doesn't seem intuitive, but the half coil arrangement will give you more top end speed even though it's actually producing less torque, try it you will be surprised.
My concern would be the ability of the driver to handle 2.5A without overheating. The tssop package that board uses is difficult to get full rated current and keep from kicking in the overtemp of the chip.
__________________
Phil, Still too many interests, too many projects, and not enough time!!!!!!!!
Vist my websites - http://pminmo.com & http://millpcbs.com |