Re: Questions on allegro uln5804 for my project......

Gabe,

I took a look at the part. The "STEP" input is the "CLOCK" in the
timing diagram.

This chip is an R/L drive; it is not a switching type drive so there
is no oscillator or current set. The phase current will be limited by
the large series resistors.

At 35V and 1.5A these would be 33 Ohms and 50 Watts each.

Mariss


--- In CAD_CAM_EDM_DRO@yahoogroups.com, "gees_lude"
<gabriel_lujan@h...> wrote:

> I am going to use this to drive my stepper motor. My motor is

rated

> at 3.72 VDC and 2.5 AmpsDC and the chip is
>
> http://www.allegromicro.com/datafile/5804.pdf
>
> Which is rated at what seems like 1.5 Amps and (the part I am

unsure

> about) 35 VDC. If it is really 35 VDC and 1.5 A then it is set,

but

> if it is 1.5 A regardless of voltage, then ohhh well.....
>
> Another question, I saw no input for a clock signal on the chip. I
> am assuming the step input would be oscillating since there is no
> dedicated clock input and one shot for a single step. Thanks for

any

> help, Gabe.