AC and DC current fault detection reference design


Design files


This reference design detects mA-level AC and DC ground fault currents. An auto-oscillation circuit is implemented using a DRV8220 H-bridge that drives the magnetic core in and out of saturation. In addition, an active filter circuit is implemented to identify fault current signal and level.

  • Discrete AC and DC ground fault detection circuit
  • Designed to sense fault current thresholds of 6-mA DC, 30-mARMS AC based on IEC62752 and IEC62955
  • Detection-to-response time < 25 ms (not including relay delay time)
  • Adjustable AC and DC trip thresholds via software
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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.

TIDUF03.PDF (954 K)

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

TIDMBA4.PDF (1306 K)

Detailed overview of design layout for component placement

TIDMBA6.ZIP (4777 K)

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

TIDCGD0.ZIP (2701 K)

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

TIDMBA5.PDF (1142 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

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Technical documentation

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Type Title Date
Design guide AC and DC Current Fault Detection Reference Design PDF | HTML Dec. 29, 2022

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