Understanding Mixed Decay and the Allegro A3977 PFD Percent Fast Decay Feature

This article explains why you might want to use mixed decay and how it is implemented in the A3977’s current chopper PWM scheme with the percent fast decay (PFD) pin. 

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Stepper Motor Wiring Options

Stepper motors may come with four, five, six or eight wires. This article will help you identify the correct way to wire an unknown stepper motor. Read the rest of this entry »