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Shunt and INA226

Craig Graham
Prodigy 30 points
Other Parts Discussed in Thread: INA226

Hi,

     I have a professor that wants to measure low side current. The system that uses a powder coat type sprayer to make fialments that are wrapped on a spinning drum. The current is in the uA-picoamp range, bit the voltage is 10KV. I believe most resistors could breakdown or have skin effect when used as a shunt. I am thinging of using an INA226 for the shunt measurement. What can be used as a shunt at this voltage level? Can the INA226 be used for this measurement and offer good isolation/protection. Is there a better way to implement this measurement? I'm thinking about using a caddock current shunt at .1 or .01ohms. Thanks for any help you can give.

Craig

 

  • 0
    TI__Mastermind 25815 points

    Hello Craig,

    Given a current in the uA-pA range, you will require a much larger sense resistor than 10mohms.  A current of 100uA and a shunt of 10mohms will create a 1uV sense voltage.  The LSB for the INA226 shunt register is 2.5uV.  The full-scale input of the INA226 is 81.92mV, which would require a sense resistor of 800ohms given a current of 100uA.  Please review Table 1 in the INA226 datasheet.

    Concerning the voltage you will want to ensure that the common-mode voltage present at the inputs of the INA226 is from 0V to 36V.