40 V to 400 V Uni-directional Current/Voltage/Power Monitoring Reference Design


Design files


This verified design can accurately measure current, voltage and power on a bus as high as 400 V using an I2C- or SMBUS-compatible interface. This design is targeted towards industrial applications where there is a need to measure system current accurately with bus voltages greater than 40 Volts such as Solar inverters, HEV/EV systems and Source generation for AC/DC electronic loads and power sources. This is a low cost non-isolated solution for high voltage current monitoring. It uses INA226 and OPA333 along with a 600-V P-FET transistor.

  • Supports Bus Voltages between 40 and 400 Volts
  • Current, Voltage and Power Monitor
  • I2C-/SMBUS-compatible interface
  • High accuracy
  • Low cost
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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.

TIDU849.PDF (1164 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


Detailed overview of design layout for component placement

TIDRJQ3.ZIP (1018 K)

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


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


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


PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Digital power monitors

INA22636V, 16-bit, ultra-precise i2c output current/voltage/power monitor w/alert

Data sheet: PDF | HTML
Precision op amps (Vos<1mV)

OPA333Micropower, 1.8-V, 17-µA zero-drift CMOS precision operational amplifier

Data sheet: PDF | HTML

Technical documentation

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View all 2
Type Title Date
Selection guide Current Sense Amplifiers (Rev. E) Sep. 20, 2021
Design guide 40V to 400V Uni-directional Current/Voltage/Power Monitoring Design Guide Mar. 13, 2015

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