High Voltage 12 V – 400 V DC Current Sense Reference Design


Design files


This Verified Design shows a circuit to measure currents with a common mode of up to 400V using an INA138. This is achieved by creating a simple floating power supply and biasing the INA138 directly from the high voltage source. The 400V in this design is an example. With different components even higher common mode voltages can be achieved. This circuit is tested and includes gerber files, test results and a detailed description of functionality.

  • Very high common mode voltage range (12V to 400V)
  • 36V CMRR
  • Small solution size (only 4 additional components)
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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.

TIDU833.PDF (284 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

TIDC952.ZIP (1150 K)

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


Includes TI products in the design and potential alternatives.

Analog current-sense amplifiers

INA1382.7 to 36V, 800kHz Variable gain current sense amplifier

Data sheet: PDF | HTML
Analog current-sense amplifiers

INA138-Q1AEC-Q100, 2.7 to 36V, 800kHz Variable gain current sense amplifier

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
Technical article How to get started with current sense amplifiers – part 3 PDF | HTML Jul. 09, 2015
Design guide High Voltage 12-V to 400-V DC Current Sense Reference Design Mar. 09, 2015

Related design resources

Design tools & simulation

CIRCUIT060032 High-voltage, high-side floating current sensing circuit using current output, current sense amp

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