TIDA-00191

Analog Front End for Motor Electronic Overload Relays with Enhanced Current Range

TIDA-00191

Design files

Overview

This reference design is the analog front end (AFE) for an electronic overload relay, used for monitoring and protecting motors from overcurrent or undercurrent events. It is an ideal tool for developers creating overload relays for sensitive AC motors in industrial applications. This programmable gain amplifier (PGA) based analog front end is intended to be an easy evaluation platform for an accurate, industry-leading 10:1 full load ampere (FLA) range and is repeatable over a -10 to +70°C temperature range.

Features
  • Wide FLA of 10:1 which dramatically reduces the number of units required on-hand
  • Current measurement accuracies of <2% over entire 10:1 measurement range from no load to locked rotor current
  • Ambient insensitivity from -10 to +70°C
  • Robust design that prevents phase reversal in overdrive conditions and high electrostatic discharge (ESD) protection (3-kV HBM)

A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDU267.PDF (4179 K)

Reference design overview and verified performance test data

TIDC346.ZIP (6894 K)

Detailed schematic diagram for design layout and components

TIDR487.PDF (355 K)

Detailed schematic diagram for design layout and components

TIDR488.PDF (97 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDC345.ZIP (797 K)

Design file that contains information on physical board layer of design PCB

Products

Includes TI products in the design and potential alternatives.

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Isolated DC/DC converters & modules

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Isolated RS-485 transceivers

ISO117640-Mbps, half-duplex, isolated RS-485 & RS-422 transceiver

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N-channel MOSFETs

CSD18537NKCS60-V, N channel NexFET™ power MOSFET, single TO-220, 14 mOhm

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Programmable & variable gain amplifiers (PGA/VGA)

PGA116Zero-Drift, 100-µV offset, 12-nV/√Hz noise, RRO (binary gain) programmable gain amp with 10-CH MUX

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Shunt voltage references

LM4041BAdjustable, precision micropower shunt voltage reference with 0.2% accuracy

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Technical documentation

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* Design guide Analog Front End for Motor Electronic Overload Relays Design Guid Mar. 21, 2014

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