DC Bus and ADC Offset Compensation for IRMCF/K300 Series Motor Control IC - International Rectifier

Catalogue DC Bus and ADC Offset Compensation for IRMCF/K300 Series Motor Control IC

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International IOR Rectifier

APPLICATION NOTE

Application Note AN-1127

DC Bus and ADC Offset Compensation for IRMCF/K300 Series Motor Control IC

By Benjamin Poiesz, International Rectifier November 2006 Version 1.0

Table of Contents

INTRODUCTION..................................................................................................2

POTENTIAL HAZARDS......................................................................................2

ADC OFFSET COMPENSATION........................................................................2

EXTERNAL REFERENCE FOR IFBK OP-AMPS...............................................3

EXTERNAL REFERENCE FOR AINX.................................................................3

PERFORMING COMPENSATION CALCULATIONS..........................................4

EXTERNAL VOLTAGE PROTECTION...............................................................5

This application note describes how to properly and safely use the IRMCF/K300 series to measure and regulate the DC Bus voltage. Two compensation methods are outlined to improve measurement accuracy involving the Analog-to-Digital converter. By following these methods the ADC will allow DC Bus measurements to be accurate within a few volts, rather than tens of volts. These same techniques can also be applied to non-DC Bus voltage measurements for more accurate results across all of the ADC inputs.

AN-1127

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