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INA250 current offset definition?

[FAE] Andrew Wang
Genius 10685 points

Hi Team,

Customer asked what is current offset (Ioffset) meant. I am not so sure about it.

Please help to verify if my understanding is correct or not, thanks.

For example, INA250A4: 2V/A, assume 1A go through internal Rshunt 2m ohms, we expect to see Vshunt = 2mV, output will be 2V, so the gain is 1000 v/v.

so 2V = 1A * Rshunt (2m ohms) * gain (1000 v/v). correct?

Ioffset RTI is 20mA at 0A shown in the spec, does this mean if we have perfect Rshunt of 2m ohms, then Vshunt offset = 40mV?  

I believe not, but what does it mean?

Thanks.

Thanks

Andrew

  • 0
    TI__Genius 15760 points

    Hi Andrew,

    Your first point is correct. 2V = 1A * Rshunt (2m ohms) * gain (1000 v/v).

    Ioffset = Current you will see in the input when no current is applied. Means that Vshunt = 20mA * 2mohm = 40uV ; Vout (due to Ioffset) = 40uV * 1000 = 40mV.

    Regards,