Noob Question: Darlington Drivers

[variable]

Hello Experts,

this might be a very noob question, I am trying to drive a 3v motor by a 08m chip, and I got told to use a darlington driver to drive the motor. I did some googling on darlington, it says it's a amplifier or some sort, could anyone please advise what actually a darlington driver is? and how do I connect to my chip to drive the motor?

Regards

James

 

[SilentScreamer]

You can use a transistor instead. Look here: http://www.kpsec.freeuk.com/components/tran.htm

The simple switching circuit can be used but rather than a push switch a output pin can be used. For more information on Darlington pairs look at the bottom of the page.

 

[variable]

thank you, so I assume I can use the BC547?

 

[jglenn]

A darlington is about the worst choice there is, other than a vacuum tube.

It is 2 transistors connected so the gains multiply. But it never really saturates,
on voltage drop can be 2V. I used a triple darlington decades ago, could control 1000A with a cmos logic gate, but not efficient, like FET's, which you
should use. Try the ZVN4206A.

 

[BeanieBots]

As jglen points out, a darlington is not the best choice for your application.
Their design requires a much larger volt-drop (loss of volts) to work. In many cases this is not a problem but driving a 3v motor from a supply not much greater than 3v could result in not enough volts to even make the motor work.