Re: [CAD_CAM_EDM_DRO] L297/L298 Question

According to ST, the maker, phase chopping is good for unipolar motors,
and inhibit(enable) chopping is better for bipolars.

Search for L298 or L297 and the word 'application' on the ST site for
many more circuit design ideas.

http://www.st.com/stonline/products/literature/an/1650.pdf

Regards,
JJ

On 18-Nov-2005, at 14:01, Wayne C. Gramlich wrote:

> I notice that the L297/L298 combo has the ability to
> be operated in two basic modes. When the Control
> line of the L297 is low, the L297 chops using the
> Enable pins on the L298. When the L297 Control line
> is high, the L297 chops using the Input lines on
> the L298.
>
> Chopping the L298 using the Enable line, causes both
> the upper and lower transistors to turn on at the same
> time; where as chopping using the Input lines causes
> only one of the H-bridge transistors to turn on and
> off (probably the upper H-bridge transistor.)
>
> So here's the question. What are the advantages and
> disadvantages of chopping using the Enable vs. Input
> lines?
>
> Any insight would be greatly appreciated.
>
> Thanks,
>
> -Wayne
>
>
>
>
>
>
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