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


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Key Document


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.

  • 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)

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Schematic/Block Diagram

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Design Files

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Bill of Materials (BOM)

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TI Devices (7)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CSD18537NKCS  60-V, N-Channel NexFET™ Power MOSFET  MOSFETs  Sample & Buy Not Available
ISO1176  2.5 kVrms Isolated RS-485 Profibus Transceiver  Isolation  Sample & Buy View Design Kits & Evaluation Modules
LM4041B  Adjustable Precision Micropower Shunt Voltage Reference, 0.2% accuracy  Voltage references  Sample & Buy Not Available
LM5017  7.5-100V Wide Vin, 600mA Constant On-Time Synchronous Buck Regulator  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
LM62  ±2°C Analog Output Temperature Sensor  Temperature sensors  Sample & Buy Not Available
PGA116  Zero-Drift, Programmable Gain Amplifier with MUX  Amplifiers  Sample & Buy Not Available
TPS55010  2.95V To 6V Input, 2W, Isolated DC/DC Converter with Integrated FETS  Offline & isolated DC/DC controllers & converters  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
CSD18537NKCS Download
ISO1176 Download Download
LM4041B Download Download
Download -
Download Download
LM5017 Download Download
Download Download
LM62 Download Download
PGA116 Download Download
TPS55010 Download Download

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Technical Documents

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

User guides (1)
Title Abstract Type Size (KB) Date
PDF 4179 21 Mar 2014
Design files (3)
Title Abstract Type Size (KB) Date
ZIP 797 28 Mar 2014
PDF 97 28 Mar 2014
PDF 355 28 Mar 2014
Related Tools & Software

Software (1)

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