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INA3221: INA3221 circuit check.

Part Number: INA3221

Hi Sir 

My customer have design INA3221 in their board, i now just find R/C filter value have some problem(customer use 10ohm & 10 uF). 

because i am not familiar this part. may you have other suggestion to us? and if some channel we have no use. may we direct flotation? (or like C3317 connect way?)

                                                              Bogey

INA3221.pdf

  • Hello Bogey,

    What problems are you seeing?  I recommend looking over datasheet section 8.4.3 titled “Filtering and Input Considerations” to see if it helps you with your design.  The capacitor you are using is outside of the recommended spec, which is to use values from 0.1 µF to 1.0 µF, as shown below.

    Also, here is a link to a thread that discusses how to deal with unused channel inputs.

    https://e2e.ti.com/support/amplifiers/current-shunt-monitors/f/931/t/534077?tisearch=e2e-quicksearch&keymatch=ina3221 

    Best Regards,

    Mitch M, 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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