I was wondering if anybody elts was having slight over heating problems with the motor driver chip.
It realy heats up !!!!!!!!!!!!! Is this normal?
How about using darlington driver ic uln2804.it provides high current gain to drive motors n little combination for flipping of polarity as shown below..might this will help to drive loads..as l293d is incapable do this job.
are you sure it's too late to change motors/ the rm3 is a drop-in replacement for the fa-130. you don't really have to change anything, aside from feeding the rm3 4-9v instead of 1.5-3v. you might want to look into it.
sorry for the stupid typing, my ctrl, shift, and alt keys stopped working for some mysterious reason.
Looking at the specs for those motors, 220mA for no-load, 660mA normally, and stall of 2.2A, I would say that the TI chip is a much better choce for the motors. It is actually designed to carry that load. (basically, it has a lower resistance, so it generates less heat for the same amount of current it carries.)
What motors are you using? The L293 is only designed to move about 100mA per channel... that's pretty much nothing. The TI SN754410 can carry up to 1A per channel, and is pin-for-pin compatible with the L293, you can just swap it out. I've run a 5-6lb robot at top speed for hours without the chip getting overly hot.
Digikey sells them for under $2, acroname also has the chip plus some other information: http://acroname.com/robotics/parts/R6-754410.html
Specs can often get fuzzy in memory. The ST Micro datasheet for the L293D shows 600 mA per channel with a 1.2 A peak, not 100 mA. The Texas Instruments L293D datasheet also shows 600mA with a 1.2 A peak.
The specs for the SN754410 are a little better at 1.1 A and a 2A peak, but both chips are used effectively.