Question on L6207 Full Bridge Driver

Hi all,

I had been studying the difference between L6205 and L6207, the only difference seems to be the presence of PWM current controller. Is there any significance of having a PWM current controller in a stepper motor driver? I am confused, because I always thought PWM in motor is to control the speed, but this time, it does not seem to have any difference at all.

Thanks a lot for your help guys

http://www.farnell.com/datasheets/17002 … 1475575852

http://www.farnell.com/datasheets/18226 … 1475575852

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