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Original question:

INA190: 4-20mA current measurement

INA4180: 4-20mA measurement

Marvn Arcangel
Genius 11320 points
Part Number: INA4180

Hi Team,

Can I use the part INA4180 for 4-20mA measurement?

Let me know if you need more information.

Regards,

Marvin

  • 0
    TI__Intellectual 1235 points

    Hi Martin,

    The INA4180 is capable of making 20mA measurement on four channels, but this will depend on the current sense shunt resistor and the INA4180 gain option.

    The customer will need to calculate the voltage across the current sense shunt resistor when the current is 20mA. Then multiply that shunt voltage with the INA4180 gain to ensure the output voltage is not railed to Vsupply. 

    For example, if the current sense shunt resistor = 1 Ω and Isense = 20mA,

    Then Vshunt = 1 Ω * 20mA = 20mV

    I'll assume Gain = 100V/V (INA4180A3 orderable) and Vsupply = 5V.

    So, Vout = 20mV * 100V/V = 2V which does not exceed Vsupply rail and is within the linear operating region.

    Please let me know if you have any further questions. 

    Cierra