AN4158 datasheet(1/34 Pages) STMICROELECTRONICS

номер детали	AN4158

подробное описание детали	Peak current control with automatic decay adjustment

PDF	34 Pages

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производитель	STMICROELECTRONICS [STMicroelectronics]

домашняя страница	http://www.st.com

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April 2015

DocID023635 Rev 2

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34

AN4158

Application note

Peak current control with automatic decay adjustment and

predictive current control: basics and setup

Enrico Poli

Introduction

The new STMicroelectronics L6472 and L6474 motor drivers provide two new patented

advanced current control systems evolving from traditional peak current control systems:

automatic decay adjustment and the predictive current control.

Using automatic decay adjustment, the L6472 and L6474 devices allow current ripple to be

reduced and control robustness to be increased especially in microstepping applications.

The predictive current control regulates the average current instead of the peak current,

obtaining a more precise positioning, and reduces the variation of the power stage switching

frequency.

Automatic decay adjustment and predictive current control allow stepper motors to be

operated with less torque ripple, fewer vibrations and much more smoothly at low speed.

This document describes the basic principles and the operation of the new control systems

and provides suggestions on parameter setup in order to obtain optimal results.

www.st.com

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