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[FAQ] What are some resources for understanding current sense amplifiers and current shunt monitors?

I want to learn all about current sense amplifiers, current shunt monitors, and magnetic sensing products.  I want reference designs, app notes, articles, and a variety of alternative solutions if the most obvious one doesn't work.  Please help me!

Best Regards,

Jason Bridgmon, TI Sensing Products Applications Support

Current Shunt Monitor Video Training Series

Hall Effect Sensor Video Training Series

TI makes no warranties and assumes no liability for applications assistance or customer product design. You are fully responsible for all design decisions and engineering with regard to your products, including decisions relating to application of TI products. By providing technical information, TI does not intend to offer or provide engineering services or advice concerning your designs.

  • The are many ways to measure current and Texas Instruments has a diverse portfolio to do exactly that!

     

    Here are a few links to get you started measuring current with TI products:

    If you don't know where to start with your current measurement design, start with this short document: Introduction to Current Shunt Monitors

    If you want to learn all about current shunt monitors implementation and error analysis, watch the Getting Started with Current Shunt Monitors video series

    If you know the device specifications you need, head straight over to the Parametric Search for Current Shunt Monitors

    If you want to learn more about current shunt monitors, the series A Current Sensing Tutorial on EE|Times (written by TIers) is a great resource.  Here are links to part 1, part 2, part 3, and part 4.

    TI Application Note SLVA704 is an excellent reference for I2C questions.

     

    This e2e thread links to many, many common topics and questions about current sense amplifiers and how to use them.

     

    These Amplifier Cookbook Recipes will get you started quickly with your design:

    SBOA300 - Low-Drift, Low-Side, Bidirectional Current Sensing Circuit With Integrated Precision Gain Resistors (with the INA214)

    SBOA299 - High-Side, Bidirectional Current Sensing Circuit With Transient Protection (with the INA240)

    SBOA295 - High Voltage, High-Side Floating Current Sensing Circuit Using Current Output Current Sense Amplifier (with the INA138)

    SBOA297 - Overcurrent Event Detection Circuit (with the INA381)

     

    There are TI Designs to help you with your implementation:

    TIDA-00313 - -48V Telecom Current/Voltage/Power Sense with Isolation

    TIDA-00328 - 50 mA-20 A, Single-Supply, Low-Side or High-Side Current Sensing Solution

    TIDA-00302 - Transient Robustness for Current Shunt Monitor

    TIDA-00614 - 30A Range Bidirectional Current Shunt Monitor Ref Design

     

    In general, Current Shunt Monitors are used to measure mA to A with good accuracy.  There are some devices that are often better suited to measuring low currents starting with the INA190 current sense amplifier, but others may use a true instrumentation amplifier, an operational amplifier, or a programmable gain amplifier.  If you are interested in low current measurement, we encourage you to look into the INA190 and also these TI Designs for a start:

    TIPD135 - 10uA-100mA, 0.05% Error, High-Side Current Sensing Solution Reference Design

    TIPD156 - Low-Drift Bidirectional Single-Supply Low-Side Current Sensing Reference Design

    TIPD104 - Current Sensing Solution, 10uA-10mA, Low-side, Single Supply

    TIPD129 - 0-1A, Single-Supply, Low-Side, Current Sensing Solution

     

    If you need to measure current with a Common Mode voltage of more than 80V, there are a few options.  Please look into:

    Extending Voltage Range of Current Shunt Monitor application note (which uses the INA168).

    TIDA-00332 - High Voltage 12 V – 400 V DC Current Sense Reference Design

    TIDA-01608Isolated Current Sense with Integrated Shunt Resistor and I2C Interface Reference Design

    TIDA-01590Reference Design for 1200V Isolated I2C High Side Current Sensing for Solar Combiner Boxes

    TIDA-00639600V Uni-directional Current/Voltage/Power Monitoring for Solar Smart Combiner Box Reference Design

    INA149 (High Common Mode Voltage Difference Amplifier).

    AMC1100 and AMC1200 (4.25kV peak Isolated Amplifier for Current Shunt Measurements).

    TIDA-00528 - 40 V to 400 V Uni-directional Current/Voltage/Power Monitoring Reference Design. 

     

    If you are interested in over-current detection, please look into:

    INA300, INA301, INA302, INA303, INA381, INA200, INA203, and INA206 products

    This video: Introduction to Optimized Over-Current with the INA300

    This document: TI Over-Current Detection Products

     

    If you are looking for High-Voltage, High-Current, non-invasive, isolated, fluxgate and magnetic current monitoring, please look into:

    DRV425, DRV411 and DRV401 products

    TIPD205 - ±100A Bus Bar Current Sensor using Open-Loop Fluxgate Sensors Reference Design (DRV425)

    The DRV425-BUSBAR-EVM which lets you try out an instantiation of TIPD205.

    TIDA-01467Over-the-Trace Three-Phase Current Sensing using Fluxgate Sensors Reference Design (DRV425)

    TIDA-00201Differential Signal Conditioning Circuit for Current and Voltage Measurement Using Fluxgate Sensors (DRV401)

    TIPD184 - 100A Closed-Loop Current Sensor Reference Design using Bi-Polar Supplies (DRV411)

    TIPD180 - ±50A Current Sensor using Closed-Loop Compensated Hall Element Reference Design (DRV411)

     

    Thank you for using TI products!

    Best Regards,

    Javier Contreras, TI Sensing Products Applications Support

    Getting Started with Current Sensing Video Training Series

    TI makes no warranties and assumes no liability for applications assistance or customer product design. You are fully responsible for all design decisions and engineering with regard to your products, including decisions relating to application of TI products. By providing technical information, TI does not intend to offer or provide engineering services or advice concerning your designs.

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