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TPS1663: Zero point accuracy of IMON

Benjamin Bawkon
Expert 1100 points
Part Number: TPS1663


Hello TI,

I am planning on using the TPS1663 in an upcoming design.  Do you have any data on the zero point accuracy of the IMON output?

The datasheet specifies some values that equate to a roughly +/-8% accuracy in terms of gain, but there is no mention of offset.  Being able to detect true 'zero' current is important for this application.  Do you have any data on the output current range of IMON at zero current through the device?

Thank You!

  • 0
    TI__Guru* 79181 points

    Hi Benjamin,

    I do not have that data handy. Let me check and get back. Can you share more details on your application?

    Regards

    Kunal Goel

  • 0 in reply to Kunal Goel
    Expert 1100 points

    Kunal,

    Thank you for checking into this.  We are doing a design revision on a current product - It is an Ethernet switch that also supplies power to the individual ports (separate wires, unlike POE) for industrial controls.  It's a very rugged design that meets (most of) DO-160G.  We supply telemetry data about the current being provided to each port to the end-user, but that accuracy isn't critical.  What is critical is being able to detect a sensor disconnect - where the current drops to zero, which is why I'm interested in the zero-point accuracy.  Some of the sensors use several amps of current, while others use just tens or hundreds of milliamps.  If the zero point accuracy is less than a few milliamps, we'll have to use external sensing across a shunt, which I would prefer to avoid.

    Thank you again,
    Ben

  • 0 in reply to Benjamin Bawkon
    TI__Guru* 79181 points

    Hi Benjamin,

    Thanks for the detailed info. Unfortunately we don't have data for VIMON for no load as we are not testing and characterizing IMON for no load. But definitely there will be some voltage at no load.

    Regards

    Kunal Goel