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Measuring Shunt current from 10 mV to 50 mV?

Ifty Husain
Prodigy 20 points
Other Parts Discussed in Thread: INA169, INA205, INA202, INA198, INA286, INA195, INA283, INA208

Hi:

I would like to measure 10mV to 50 mV shunt at 60VDC max resulting in linearly proportional output voltage from 0 to 5VDC in a telecom battery plant application.

Could you suggest a suitable TI part?

Thanks,

Ifty

  • 0
    TI__Genius 14825 points

    Ifty,

    We do have some current shunt monitors that go up to 80V common mode.  Do you mean 10mA-50mA?  What size shunt resistor do you intend to use?  I can make a better recommendation with this information.  Do you need a digital interface or an analog output?

    Thank you,

    Jason Bridgmon

  • 0 in reply to Jason Bridgmon
    Prodigy 20 points

    Hi Jason:

    We are using .08 ohm shunt resistor. It is a common mode voltage of 48VDC, with Vsense= 10mV to 50 mV drop across the shunt.

    I am looking for analog output voltage of either 0 to 5VDC or 0 to 10 VDC

    Thanks,

    Ifty

  • 0 in reply to Jason Bridgmon
    TI__Genius 14825 points

    Ifty,

    A good read (just 7 pages) is http://www.ti.com/lit/slyb194, which discusses current shunt monitor operation parameters and offers some guidance on which ones to pick based on your design parameters.

    You can also jump straight to our parametric selection guide on the web at ti.com.

    I hope this helps.

    Jason Bridgmon

  • 0 in reply to Ifty Husain
    TI__Genius 14825 points

    Ifty,

    For a common mode of 48V, you'll find our 60V-80V common mode capable products good.  Since you need 0 to 5V or 10V output, you'll need a gain of 100 or 200 with a 50mV max input.  Since you need to measure down to 10mV, you won't want to use our INA202, INA205, INA208, INA195, or INA198 as they don't really work below 20mV.  I would suggest the INA286 or INA283 or maybe the INA169.

    Jason Bridgmon