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View Full Version : Problems with L293D. It's getting HOT !



dmage
05-22-2006, 02:34 AM
Hello!

Im using L293D to control 2 brushed motors with gearboxes which is mounted in the base of some chinise tank stuff.

So, how can i solve this problem?

Is this IC have a replacement with the same pinout but more powerful ?

Thanks.

yogi
05-22-2006, 11:02 AM
I have explained about this in my book

MY EXPERIENCE IN AUTONOMOUS ROBOTICS

you can get it from yahoo group-booksbybibin
http://groups.yahoo.com/group/booksbybibin/

give ur suggestions about this book on
http://www.booksbybibin.blogspot.com/

Bibin John
www.bibinjohn.tk

dmage
05-22-2006, 12:22 PM
Let's see...

devpriya
05-22-2006, 03:33 PM
Yes there is one IC with better current ratings and the same pinout configuration. The IC is 754410

dmage
05-22-2006, 09:40 PM
here is the fotos of my future droid's base =)

http://dm32-penza.narod.ru/foto/droidbase1.jpg
http://dm32-penza.narod.ru/foto/droidbase2.jpg

orion
05-23-2006, 01:08 AM
Hi,
Has anyone tried stacking two L293Ds one above the other to get more output current?? This works in most cases.
Cya,
Mohit Bhoite
http://mobots.solarbotics.net

rao
05-23-2006, 08:44 AM
yup tried that.. nearly gives upto 800-900mA

dmage
05-23-2006, 10:37 AM
Some data about platform:

1.25A when i hold it in air and truckcka go ahead or backward or it turns.

600mA per channel in "idle". Is it normal for L293D?

devpriya
05-23-2006, 11:12 AM
Yes even I have tried putting L293Ds in Parallel.........Well I have wierd idea in mind.

I have made a PCB layout which has sockets for 8 L293D all in parallel, so it can be considered as a board which can support upto 8X600mA per channel !

And look at the flexibility.....you plug in as many L293D in the socket as you need and leave the other sockets empty :D

I know this is not at all a good way to make a motor driver but what to do if your traditional H-Bridge configurations with MOSFETs keep ditching you every now and then :(

What you guys got to say on this wierd idea ? All suggestions and objections are welcome :D

dmage
05-23-2006, 01:30 PM
parallel... hm it seems too expensive... but what about 600ma... its per channel or not ?

rao
05-23-2006, 10:18 PM
good going dev.. and with all the prize money earnings.. you can afford to increase your motor current ratings by leaps and bounds :P .. No pun intended

Seriously,thats some good thinking... having a readymade motor control board supporting variable current requirements..good stuff

Rao

dmage
05-24-2006, 12:05 PM
Yeah. I think about stacking too...

dmage
05-24-2006, 06:57 PM
maybe active cooling ? I ve got a chipset cooler ! )) :D

dmage
06-02-2006, 12:38 AM
the problem is solved.

we now using continously rotating fan to cool down the L293D.

also we add some drivers (74VHCT00) to stack in the Cygnal 3volt controller with 5volt logic.

Having fun now.

Any shematics or PCB are welcomed ?

dmage
06-04-2006, 10:02 PM
heres somee fotos of our motor controller.

http://dm32-penza.narod.ru/foto/motorcnt1.jpg
http://dm32-penza.narod.ru/foto/motorcnt2.jpg