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In order for stepper motors to run smoothly and have a good micro-step
resolution, stepper motors require precise current control or
regulation. After the output current reaches each micro-stepping current
regulation point, the inductive output current will keep the same direction
during this pulse width modulation (PWM) off period. The output current drop
rate is decided by the coil terminal voltage and the motor back electromotive
force (EMF). The decay mode selects the re-circulation current path and
determines how fast or slow the current drops once the current reaches the
regulation point.
