Driving Peltier element through L298N

sachink · ‎2013-09-10

Posted on September 10, 2013 at 11:27

Hi,

I want to drive peltier element to control temperature of one module. Peltier specifications are:

Imax = 9A and Vmax = 3.75V.

Such 4 peltiers are connected in series to control to module temperature.

I am planning to use L298N for driving it. As shown if I connect L298N two pins in series then I will be able to drive current upto 4A. But, to control my module temperature, Peltier is sinking average 4A current.

So, It I can't use single L298N IC as it will heat too much and also it will damage.

So, I want to know whether it is possible to use two L298N ICs in parallel to give higher current.

If so then please advice me for input and output pin connections.

Thanks & Regards,

Sachin Panchal

Enrico Poli · ‎2013-09-16

Posted on September 16, 2013 at 11:12

Hello,

Paralleling more L298N is not reccomended because the bipolar technology characteristics. The spead of the saturation voltage and its variation with the temperature could cause one of the devices driving a current which is significantly higher than the other one.

Moreover two L298N in parallel can drive up to 8 A only (the actual maximum load current is probably limited by the power dissipation).

I suggest to use three L6203 in parallel.

Regards

Enrico