Re: [CAD_CAM_EDM_DRO] L297-L298 Problems

Bard,
it depends on the size of sense resistors used.
VRef is the reference volts at the input to a comparator set by a pot.
The other comparator input looks at the sense resistor volts.
This limits the output current.
If you use 0.5 ohm (non inductive) sense resistors, VRef/0.5 = Ioutput.
The max current for L298 (L297 has none) is 2 Amps. So VRef will be set to 1 Volt.
Don't forget the heatsink.
RichD


Bard wrote:

>
>
> Hello All
>
> Im building the L297-L298 Stepper Motor Driver. I have a doubt about Current
> Sensing Pins. Im using 3.2V - 2.2 A per Phase stepper motors, and I need
> to know what resistor should I use to regulate the Current?? What is the
> Vref in L297??
>
>
> Thanks Anyway...