Re: [CAD_CAM_EDM_DRO] Questions on allegro uln5804 for my project......

On Thu, 24 Apr 2003 22:42:34 -0000, you 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.....

I think that this will handle 1.25 amps continuous, 1.5 amps surge.
This is less than what your motor needs, unless you wish to run it at
1.25 amps (about half power). The large resistor in the common coil
lead to 20 volts limits the current. You will have to pick that value
for 1.25 amps steady state.

>
>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.

Each time the step input changes from high to low, the stepper
advances one step.

The clock input can be stopped in the 1 state, and the motor will hold
position.

Harvey

>