Shunt-Based 200A Peak Current Measurement Reference Design Using Isolation Amplifier TIDA-00445 (ACTIVE)

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Key Document

Description

The TIDA-00445 TI design provides a reference solution for isolated current measurement using shunt and isolated amplifier. By limiting the shunt voltage to 25mV, this design is able to reduce power dissipation in the shunt and achieves a high current measurement range of up to 200A. Shunt voltage is further amplified by precision Opamps in instrumentation amplifier based configuration with a gain of 10 to match the input range of isolation amplifier. The output of isolation amplifier is level shifted and scaled to utilize the complete input range of 3.3v ADC. This design uses free running transformer driver for generating isolated supply voltage for the high voltage side of the circuit. Small form factor for the power supply is achieved by the operation of driver at 400 KHz.

Features
  • Shunt based isolated 200Apk current measurement solution
  • Limiting shunt voltage to 25mV helps achieving less power dissipation
  • High-Side Current Sense Circuit With High Common Mode Voltage of 1200 V peak Supporting up to 690V AC Mains Powered Drives
  • Calibrated AC accuracy of <1% across temperatures -25˚c to +85˚c
  • Can be Interfaced directly with differential or single ended ADC
  • Small form factor push pull based isolated power supply to power high side circuit
  • Inbuilt 1.65VREF for level shifting the output.

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TI Devices (8)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
AMC1200  ±250 mV-Input Basic Isolated Amplifier for Current Sensing  Isolation  Sample & Buy View Design Kits & Evaluation Modules
AMC1301  ±250 mV-Input Precision Reinforced Isolated Amplifier for Current Sensing  Isolation  Sample & Buy View Design Kits & Evaluation Modules
LM4040  Precision micropower shunt voltage reference  Voltage references  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)
AMC1200 Download Download
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AMC1301 Download -
LM4040 Download
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LM4040-N Download Download
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OPA2376 Download Download
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Download -
OPA376 Download Download
Download Download
Download Download
REF2033 Download -
SN6501 Download Download

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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 2056 05 Mar 2016
Design files (6)
Title Type Size (KB) Date
ZIP 207 11 Dec 2015
ZIP 1709 11 Dec 2015
PDF 384 11 Dec 2015
PDF 83 11 Dec 2015
PDF 43 11 Dec 2015
PDF 479 11 Dec 2015
Related Tools & Software

Reference Designs  ( 3 )


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