Hey,
I have a question regarding the L298 dual H bridge driver. I am using one in conjunction with an L297 stepper controller and a dsPic, to drive a 1.2A/phase bipolar stepper motor. The supply voltage to the motor is 15vDC, but this is obviously chopped to keep the current at 1.2A/phase.
My question concerns the L298, and more specifically the method of how to calculate its power dissipation. For the other higher current h bridges I am using, I know the resistance of the MOSFETs so I can work out power by P=I^2 * R. For the L298, how should I work out what the power dissipation is? I know the current but I don't know the voltage drop between the supply and the motor - or am I able to work this out from the motor specifications (coil resistance, inductance etc)?
Any help you are able to provide will be most appreciated
Jason