Let's Make Robots!

L293D Motor driver


Vendor's Description: 


This chip enables you to take 4 outputs and turn them into 2 that can be reversed.

Note that the chip can get quite warm, but it is designed for that. 

 

Benefits: 

You can control 2 motors in both directions instead of 4 in only one direction. 

 

Disadvantages: 

There is a 1.5V voltage drop within the L293D driver chip.

If you run both motors and servos on the same circuit, your servos will allways get 1.5V more than the motors - and typically you would want it the other way around! 

Comment viewing options

Select your preferred way to display the comments and click "Save settings" to activate your changes.

"And they're otherwise pin-compatible, so you don't even have to change your designs."

Wow, thanks, Elliot, that is very, very interesting for us who tend to use standard boards. Thank you very much! 

/ Frits 

Everyone's got a favorite chip, but have a look at the SN754410. http://focus.ti.com/docs/prod/folders/print/sn754410.html.

The L293 has 1A drive, but no clamping diodes while the L293D has 600mA drive with clamping diodes. The SN gets you both 1A and diodes, and they're a tad cheaper at Digikey or Mouser (in the US at least). And they're otherwise pin-compatible, so you don't even have to change your designs.

 

 

I think the manual indicates that diodes inside the SN754410 are for ESD protection not for kickback protection by the motor's inductance. Use it for kickback protection is not gauranteed.

Regards,

-Pandit

 

You are right. We had a discussion about this in another thread recently.