Three Phase AC Current Measurements Using Current Transformer Reference Design


Design files


The TIDA-00753 reference design demonstrates high accuracy wide range AC current measurement for a three phase motor using the INA199 zero drift current shunt monitor. The design also has low power consumption of 25mW for Gain stage of 200 as compared to a discrete solution. The design footprint and BOM cost is much smaller than a discrete solution due to the integrated high precision resistors inside the INA199.

  • 0.5 % Accuracy (Uncalibrated)  for 10 to 100 % of Full Scale Primary Current
  • Power Consumption of 25 mW for Gain Stage
  • Small Footprint no need of External Resistors for Amplfication
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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.


Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


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


Detailed overview of design layout for component placement

TIDRKX1.ZIP (1590 K)

Files used for 3D models or 2D drawings of IC components


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


PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Analog current-sense amplifiers

INA19926V, bi-directional current sense amplifier

Data sheet: PDF | HTML
Analog current-sense amplifiers

INA199-Q1AEC-Q100, 26V, bi-directional current sense amplifier

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TPS717150-mA, high-PSRR, low-IQ, low-dropout voltage regulator with enable

Data sheet: PDF | HTML
Series voltage references

REF32121.25-V 4ppm/°C, 100-µA, 6-pin SOT-23 series (bandgap) voltage reference

Data sheet: PDF

Technical documentation

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Type Title Date
* Design guide Three-Phase AC Current Measurements Using Current Transformer Design Guide (Rev. A) Jun. 10, 2016
Selection guide Current Sense Amplifiers (Rev. E) Sep. 20, 2021

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