Kev Pearce (kevp.com) wrote:

>Hi all,
>
>I'm trying to put together a stepper motor driver board using L297/8's.
>
>The stepper motors I'm using are rated bipolar 4.2V/phase at 1.2A/phase.
>
>I wanted to use an old PC power supply, as it can nicely do 5V at upto 22A ready done.
>
>But what's the best way to get 4.2V from 5V at about 3A per driver board and be able to run it with a L298???
>I've tried looking up voltage regs at 4.2V with no luck, or zeners...
>Would a simple series resistor or voltage divider do the job... but at 15W could they handle it???
>
>Anyone any ideas...
>
>
>Cheers all
>
>Kev/.
>  
>
Hi-

Well, I expect you can run them at 5V, that's only 20% over voltage.  
Many people run their steppers at 2-3x the rated voltage, which gives 
better performance.  

This is a good summary: http://www.cs.uiowa.edu/~jones/step/

David


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