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INA250 VOUT reacts to IN- only signal

Alfred Bos
Prodigy 30 points
Other Parts Discussed in Thread: INA250

Hi,

I hope someone can help me. Basically my application is one of monitoring current of course. I also have a part of the circuit that is powered by the same voltage that is put at the input, since the input power can switch polarity I use a bridge rectifier. So far so good...

The +5VDC and VREF (2.5V) are all ok, independant of the polarity of SP1/SP2

But VOUT will change !

If SP2 = +24VDC no problem, VOUT=2.5VDC, but if SP2 is GND, VOUT changes to around 1v ?!?!?

Does anyone has an explaination for this behaviour, and or perhaps have a solution ? I assume it has to do with the INA250 internals...so perhaps someone from TI can comment on this ?

  • 0
    TI__Genius 15760 points

    Hi Alfred,

    Which INA250 are you using? Which gain version?

    There are few experiments you can try out to figure out if there is something going on with the INA250:
    1. Measure the differential voltage between IN- and IN+ when SP2 = 0V and SP2= 24V, verify output.
    2. Isolate the INA250 and apply a differential voltage to the inputs, verify the output.

    Regards