AN1495 Datasheet, PDF (1/25 Pages) STMicroelectronics – Microstepping stepper motor drive

AN1495
Application note
Microstepping stepper motor drive
using peak detecting current control
By Thomas Hopkins
Introduction
Stepper motors are very well suited for positioning applications since they can achieve very
good positional accuracy without complicated feedback loops associated with servo
systems. However their resolution, when driven in the conventional full or half step modes of
operation, is limited by the configuration of the motor. Many designers today are seeking
alternatives to increase the resolution of the stepper motor drives. This application note will
discuss implementation of microstepping drives using peak detecting current control where
the sense resistor is connected between the bottom of the bridge and ground. Examples
show the implementation of microstepping drives with several currently available chips and
chip sets.
September 2012
Doc ID 8700 Rev 3
1/25
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