40 V to 400 V Uni-directional Current/Voltage/Power Monitoring Reference Design
This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.

Description & Features

Technical Documents

Support & Training

Order Now

See the Important Notice and Disclaimer covering reference designs and other TI resources.


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.



• The integrated load-dump protection reduces external voltage clamp cost and size

• Onboard load diagnostics report the status of the speaker through I2C, which reduces external components needed for diagnostic coverage

• TLV320AIC3104-Q1 + TAS5411-Q1 combo allows for reduced power consumption, reduced heat
and reduced peak currents in the electrical system

• TAS5411-Q1 provides up to 8W output power for loud, clear audio in an unpredictable emergency environment

• Additional output from the TLV320AIC3104-Q1 can be used for the head unit or other car audio needs and eliminates the need for another device

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


See the Important Notice and Disclaimer covering reference designs and other TI resources.


Schematic/Block Diagram

Quickly understand overall system functionality.

Download Schematic

Test Data

Get results faster with test and simulation data that's been verified.

Download Test Data

Design Files

Download ready-to-use system files to speed your design process. Get Viewer.

Download Design Files

TI Devices (2)

Order samples, get tools and find more information on the TI products in this reference design.

Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
INA226  36V, 16-bit, ultra-precise i2c output current/voltage/power monitor w/alert  Current sense amplifiers  Sample & Buy View Design Kits & Evaluation Modules
OPA333  1.8-V, 17-µA, microPower, precision, zero-drift CMOS op amp  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
INA226 Download Download
OPA333 Download Download
Download Download
Download Download

Texas Instruments and Accelerated Designs, Inc. have collaborated together to provide TI customers with schematic symbols and PCB layout footprints for TI products.

Step 1: Download and install the free download.

Step 2: Download the Symbol and Footprint from the CAD.bxl file table.

Technical Documents

See the Important Notice and Disclaimer covering reference designs and other TI resources.

User guides (1)
Title Type Size (KB) Date
PDF 1164 13 Mar 2015
Selection guides (1)
Title Type Size (KB) Date
PDF 1772 04 Apr 2018
Design files (7)
Title Type Size (KB) Date
ZIP 272 15 Dec 2015
ZIP 185 15 Dec 2015
ZIP 1018 15 Dec 2015
PDF 580 15 Dec 2015
PDF 91 15 Dec 2015
PDF 114 15 Dec 2015
PDF 280 15 Dec 2015

Support & training

Search our extensive online knowledge base where millions of technical questions and answers are available 24/7.

Search answers from TI experts

Content is provided 'AS IS' by the respective TI and Community contributors and does not constitute TI specifications.
See terms of use.

If you have questions about quality, packaging, or ordering TI products visit our Support page.

Technical articles