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INA592: Newer better version where Vcc does not need to be stacked.

Art Mecina
Genius 16795 points
Part Number: INA592
Other Parts Discussed in Thread: INA149

Hello Guys,

Good day.

Our customer is using this component (INA592IDGKR) to record cell voltage data from a stacked battery system. The one drawback this has is they also need to stack the Vcc voltages, which can mean large supply voltages depending on the configuration.

Does TI have a newer version or any diff amps that don't need their Vcc voltages stacked to do this type of monitoring?

Thanks and regards,

Art

  • 0
    TI__Genius 10850 points

    Hi Art,

    Thanks for your post, I can help you.

    What is the battery stack cell voltage? How many cells are there? Something like the INA149 could be useful since the input resistors are so large and can divide down the input voltage to a linear range.

  • 0 in reply to Tamara M Alani
    TI__Genius 16795 points

    Hello Tamara,

    See below response from customer in verbatim.

    "The total Stack voltage is 24V, 6S pack. I'd like to run the INAs from a separate voltage source.
    There is a note in the datasheet that that family of opamps can have their inputs be a higher voltage than Vcc, since they are differential inputs. How much higher? could I have them monitoring a stack of 24Vdc while powering them from a separate 5V source?"

    Thanks and regards,

    Art

  • 0 in reply to Art Mecina
    Guru 140200 points

    Hi Art,

    the interesting question is how precise this voltage measuring shall be performed. Otherwise a simple OPAmp with a simple voltage divider can do the trick.

    Kai

  • 0 in reply to kai klaas69
    TI__Genius 16795 points

    Thanks Guys.

    I will ask customer about the precision of the voltage measurement and will update you guys.

    According to the customer the image below from INA149 looks like what he is trying to do but this diagram does not mention the Vcc range needed. Does it have to be larger than the cell stack-up voltage?

    Thanks and regards,

    Art