Isolated, Shunt-Based Current Sensing Reference Design

(ACTIVE) TIPD165

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Key Document

Description

This Verified TI Design implements an isolated current sensing data acqusition solution based on the AMC1304M25 isolated delta-sigma (ΔΣ) modulator and a TMS320F28377D microcontroller.  This circuit was designed for shunt-based current measurement applications which require excellent galvanic isolation and accuracy, such as industrial motor drives, photovoltaic inverters, and energy metering.  It is capable of measuring load currents from -10 A to +10 A with better than 0.3% uncalibrated accuracy, and it also provides dual functionality of a high resolution channel and an additional over-current or short-circuit detection channel.  The design’s functionality and performance were verified against the circuit design goals by fabricating three PCBs and measuring results for dc and ac input signals.

Features
  • Verified Design contains theory, component selection, TINA-TI simulation, measured results, PCB layout, and modifications
  • Galvanically isolated current sensing solution
  • 16-bit output at 78.1 kSPS
  • ±10 A at <0.3% (uncalibrated accuracy)
  • 78dB SNR (min)

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Schematic/Block Diagram

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Test Data

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Design Files

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Bill of Materials (BOM)

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TI Devices (13)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
AMC1304M05  Reinforced Isolated Modulator With LDO Regulator, ±50mV Input, and CMOS Interface  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
AMC1304M25  Reinforced Isolated Modulator With LDO Regulator, ±250mV Input, and CMOS Interface  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
AMC1305M05  Reinforced Isolated Modulator With ±50mV Input and CMOS Interface  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
AMC1305M25  Reinforced Isolated Modulator With ±250mV Input and CMOS Interface  Analog-to-digital converters (ADCs)  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
TMS320F28374S  Single-Core Delfino Microcontroller  C2000 real-time control MCUs  Not Available View Design Kits & Evaluation Modules
TMS320F28375S  Single-Core Delfino Microcontroller  C2000 real-time control MCUs  Not Available View Design Kits & Evaluation Modules
TMS320F28376S  Single-Core Delfino Microcontroller  C2000 real-time control MCUs  Not Available View Design Kits & Evaluation Modules
TMS320F28377D  Dual-Core Delfino Microcontroller  C2000 real-time control MCUs  Sample & Buy View Design Kits & Evaluation Modules
TMS320F28377S  Single-Core Delfino Microcontroller  C2000 real-time control MCUs  Sample & Buy View Design Kits & Evaluation Modules
TMS320F28379D  Dual-Core Delfino Microcontroller  C2000 real-time control MCUs  Sample & Buy View Design Kits & Evaluation Modules
TMS320F28379S  Single-Core Delfino Microcontrollers  C2000 real-time control MCUs  Sample & Buy View Design Kits & Evaluation Modules
TPS795  Ultralow-Noise, High-PSRR, Fast, RF, 500-mA Low-Dropout Linear Regulators  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
AMC1304M05 Download Download
AMC1304M25 Download Download
AMC1305M05 Download Download
AMC1305M25 Download Download
SN6501 Download Download
TMS320F28374S Download Download
Download Download
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TMS320F28375S Download
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TMS320F28376S Download Download
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TMS320F28377D Download Download
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TMS320F28377S Download Download
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TMS320F28379D Download Download
Download Download
TMS320F28379S Download
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TPS795 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 Views TI Recommends
PDF 14031 21 Nov 2014 28
Design files (6)
Title Abstract Type Size (KB) Date Views
ZIP 1361 07 Nov 2014 2
ZIP 1371 07 Nov 2014 1 1
PDF 65 07 Nov 2014 0
PDF 63 07 Nov 2014 0
PDF 780 07 Nov 2014 3
PDF 1032 07 Nov 2014 4
Related Tools & Software

Software (3)



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