do you have a link with tech info about this L293D ?
It gets hot because it is passing too much current. So try and calculate how much current this is to see if the L239 is up to the job.You could add a heatsink if it is. Otherwise get another driver that is up to the job. Or lower the voltage, only as a last resort add a resistor to each coil.
The L293D is a older component. It has a 2 or 3V voltage drop. So is produces a lot of heat.Newer motor drivers use mosfets, they have very little voltage drop.The magic word is "piggyback".The L293D allows to have more than one parallel. So you can solder 1 or 2 or 3 extra L293Ds on top of the first one.Be sure to make good solder connections for all pins.
Take a look at the range of automotive h-bridges from ST.... Pololu sell premade boards if you don't wish to do your own http://www.pololu.com/catalog/product/708As far as I'm aware, they have the lowest total on resistance of any integrated h-bridge solution currently available, orders of magnitude less than what you're using now!
Thanks, but I want to do this as my own project
if I connect a 20ohm resistance to the motor supply pin of L293D for 12V supply voltage, should it work for lowering the current? I reckon, It should lower the current to 0.6amp ??
Quoteif I connect a 20ohm resistance to the motor supply pin of L293D for 12V supply voltage, should it work for lowering the current? I reckon, It should lower the current to 0.6amp ?? Just about the worst thing you can do. If you must use resistors have one in each coil. It will lower the current to much less, what is the resistance of your coils?
2.I have 4 TIP 3055 at home, can I connect them to each output of L293D and supply the 12V over them? So that I can only use the same 5V of logic supply for the motor supply input of L293D and it will only send the output signals to the gate of TIP 3055s. so, all the current will flow over the MOSFETs ??