Re: A3977 Current setting (Danged search changes!)

4.7 Amps.

Mariss


--- In CAD_CAM_EDM_DRO@yahoogroups.com, "ghidera2000"
<ghidera2000@y...> wrote:

> I asked this and was answered a loong time ago but, Yahoo wont

search

> beyond the visible page.
>
> Anyway, I took a (looong) break from CNC topics and now I'm unsure
> about one aspect of controlling steppers with the A3977 chip.
>
> Given a motor with a rating of 1.7V@4... = 7.99 watts. If I drive

it

> at 24 volts then its current requirement is down around 0.33 amps -
> Correct?
>
> Do I set I-Trip to 0.33 amps or does it actually require a 4.7A
> setting? Impossible with this chip, it only does 2.5A I know.
>
> My memory says I set I-Trip to limit the current to ~0.33 amps. In

a

> different discussion a person is saying you still need to supply

4.7A

> (short duration instantaneous current draw) so you'd have to set
> ITrip to the max.
>
> Thanks in Advance,
> Signed: Mr. Alzheimers.