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INA220: Current Meter is failed for reading operation during a voltage transient.

Neta Sherer
Intellectual 560 points
Part Number: INA220
Other Parts Discussed in Thread: INA237, INA240

Hi,

We are using the mentioned P/N for current measurement with the following scheme:

 

The sequence we are using is pretty straight forward:

  1. Setting Vout2_R to 9V -> Expected result are measured by the INA220
  2. Setting Vout2_R to 16V -> INA220 is stop working and can be recovered only upon a power down-up sequence of the platform.

Additional observations:

  • Once we are in the transient from 9V to 16V we are experiencing the following wave form on the Vout_2:

It looks to us that the INA220 is failing to serve such voltage transient.

Are we correct?
Please let us know what we can do in order to improve the design.

Thanks,
Neta

  • 0
    TI__Intellectual 1235 points

    Hi Neta, 

    Yes, the INA220 is an older part that does not handle fast common-mode transients well. 

    I would recommend upgrading to the INA237, which is a newer drop-in replacement with better performance. The only pinout difference is that pin 3 on the INA237 is an ALERT, which may be left floating if not used.

    Our analog current sensors such as the INA240/241 are better suited for these fast transients, but the INA237 may be able to at least recover from this transient without power cycling. 

    Cierra

  • 0 in reply to Cierra Cowley
    Intellectual 560 points

    Hi Cierra,

    Thanks for the fast reply.

    It looks like we are not the right path.

    We are looking for the most resilient solution while assuming that power cycle is not something applicable in our application, but a reset operation is applicable.

    We will take a look.

    Thanks,