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24V stepper motor interfacing with 8051

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K2DGR8

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Dear Friends,
We are interfacing a 24V unipolar stepper motor to a Microcontroller..
But, we are not yet clear about some concepts regarding the interfacing.

The motor will run on 24V supply..
So, if I am right, it should be provided with 24V by with another power supply.
But, the normal current ratings of the motor are around 500mA.

So, is it necessary for the 24V power supply to provide 500mA current also?

Or, the driver IC, ULN 2003 will serve this purpose?

Thanking you in advance!
 

In general, the source of voltage is always the source of current. If ULN2003 is providing voltage, it can also provide current upto 500mA, as per datasheet. So it depends on how you are using uln2003??
 

Thank You Genovator!
Can ULN 2003 Provide 24V dc supply?

Well I am also searching datasheet of ULN 2003..
But, can U tell me if ULN 2003 is good enough for providing voltage & current or should I go for some different driver IC?
 

I have never used ULN2003, but as its datasheet states, it can provide voltage of max 50V and current of max 500mA. It all comes under your requirements. If you are using only a single stepper motor, then you can only use a mosfet like IRFZ44N. I never worked with stepper motors, so you know better about the driver ICs.
 

Thanks a lot!
Since I am using a single stepper motor, I will surely give a try for IRFZ44N!
 

K2DGR8 said:
So, is it necessary for the 24V power supply to provide 500mA current also?

Or, the driver IC, ULN 2003 will serve this purpose?
Click to expand...

The ULN2003 can provide upto 500mA. This means that it can drive a load with current up to 500mA. It can sink current up to 500mA. But, this current has to come from somewhere. It will come from the power supply. So, if the ULN2003 has to drive a load with 500mA current, this current must be supplied by the power supply.

If you need to drive up to 500mA, instead of using one output of the ULN2003, you should connect 2 (or more) outputs of the ULN2003 in parallel for increased current handling capacity.

Hope this helps.
Tahmid.
 
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Thanks Tahmid!

I will surely give a try for your suggestion!
 

Since you need 4 pins for the interface, if you parallel 2 outpus of ULN2003 for increased current handling, you'll need 8 pins from the ULN2003 ouptut. But ULN2003 only has 7. So, you may want to use ULN2803.
 
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