Shunt-Based High Current Measurement (200-A) Reference Design with Reinforced Isolation Amplifier

(ACTIVE) TIDA-00912

Description & Features

Technical Documents

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Key Document

Description

The TIDA-00912 TI Design provides a complete reference solution for isolated current measurement using external shunts, reinforced isolation amplifiers, and isolated power supply. The shunt voltage is limited to 25 mV max. This reduces power dissipation in the shunt to enable a high current measurement range up to 200 A. Shunt voltage is amplified by a instrumentation amplifier configuration with a gain of 10 to match the input range of isolation amplifier for better signal to noise ratio. The output of isolation amplifier is level shifted and scaled to fit the complete input range of 3.3-V ADCs. This design uses free running transformer driver operating at 410 kHz for generating isolated supply voltage in a small form factor to power high voltage side of the circuit. 

Features
  • Shunt-based 200 A peak current measurement solution with reinforced isolation
  • Limiting shunt voltage to 25 mV reduces power dissipation
  • High-side current sense circuit with high common-mode voltage of 1500-Vpeak, supporting up to 690-V AC mains powered drives
  • Calibrated AC accuracy of <1% across temperatures -25oC to 85oC
  • Can interface directly with differential or single-ended ADC
  • Small form factor push pull-based isolated power supply to power high-side circuit

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Schematic/Block Diagram

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Design Guide

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Design Files

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Bill of Materials (BOM)

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TI Devices (6)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
AMC1301  Precision Reinforced Isolated Amplifier for Current Sensing  Special function amplifiers  Sample & Buy View Design Kits & Evaluation Modules
LM4040-N  100-ppm/°C precision micropower shunt voltage reference  Voltage references  Sample & Buy View Design Kits & Evaluation Modules
OPA2376  Precision, Low Noise, Low Quiescent Current Operational Amplifier  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
OPA376  Precision, Low Noise, Low Iq Operational Amplifier  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
REF2033  Low-Drift, Low-Power, Dual-Output Vref and Vref/2 Voltage Reference  Voltage references  Sample & Buy View Design Kits & Evaluation Modules
SN6501  Low-noise, 350 mA, 410-kHz transformer driver for isolated power supplies  Isolation  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
AMC1301 Download -
LM4040-N Download Download
Download Download
Download Download
OPA2376 Download Download
Download Download
Download -
OPA376 Download Download
Download Download
Download Download
REF2033 Download -
SN6501 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 4374 21 Sep 2016
Design files (6)
Title Abstract Type Size (KB) Date
ZIP 266 25 May 2016
ZIP 2110 25 May 2016
PDF 720 25 May 2016
ZIP 159 25 May 2016
PDF 91 25 May 2016
PDF 388 25 May 2016
Related Tools & Software

Development Tools (1)

Name Part Number Tool Type
SPICE-based analog simulation program  TINA-TI  Circuit Design & Simulation 

Models (2)

Title Category Type Size (KB) Date Views
TIDA-00912 Simulation (Power Supply) TINA-TI Reference Design ZIP 105 KB 09 Jan 2018
TIDA-00912 Simulation (Analog Circuit) TINA-TI Reference Design ZIP 110 KB 09 Jan 2018

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