[mannster]

I have really been looking into chopper drivers and am really interested in their inner workings. I understand the concept but am having difficulties with one detail. The Vref and Sense resistors that are used by the comparator circuit have an important relationship which I am trying to understand.

If you have a simple explanation, please share it with me.

Double check my thinking:

If my Vref voltage is 2.5 volts, then regardless of the motor power source 24volts-30volts, if I desire 1.5 amps as the limit for the chopping, then I need a resistance of 1.6 Ohms and 4 watts of dissipation from the sense resistors.

*If this is wrong....please don't think I can explain how i got here...This was the best I could do with the internet and Ohm's law.

I do want to use 2.5volts for the Vref, and my motors are 3.2 ohm rated for 4.5 volts and 1.4 amp per phase UNIPOLAR.

Thanks in advance !