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INA195 Negative Vsense input

Tomoaki Yoshida
Expert 2200 points
Other Parts Discussed in Thread: INA195

Hi,

 

I have a  question.

 

If Vsense will be negative voltage, is the Vout 0V?

Normally the Vsense is positive, however the Vsense may becomes negative momentarily by the surge in our system.

It is no problem for our system, if  Vout is 0V or fixed.

 

Best regards,

Tomoaki Yoshida

 

  • 0
    TI__Mastermind 32290 points

    Tomoaki,

    The INA195 has different output with inputs below 20mV depending on the VCM voltage and VS voltage.  Our datasheet explains the two behaviors.

    http://www.ti.com/lit/ds/symlink/ina195.pdf

    See section 8.4.2.3 in datasheet for

    VSENSE < 20mV, −16v ≤ VCM < 0;

    OR VSENSE < 20mV, VS <VCM ≤ 80V

     

    See sections 8.4.2.4 for

    VSENSE < 20 mV, 0 V ≤ VCM ≤ VS


    If this is not clear please let me know.

    Regads,

    Javier

  • 0 in reply to Javier Contreras4
    Expert 2200 points

    Hi Javier,

     

    I apologise for the delay in replying to you.

    I saw the Figure.26 and Figure.27 in datasheet.

    In this graph, the Vsense is positive voltage.

    If Vsense will be from 0V to -18V , will the output voltage  remain 0V and not change?

    If less than a predetermined voltage is no problem, but the troubled that there is such as to reverse at a certain voltage.

     

    Best regards,

    Tomoaki Yoshida

  • 0 in reply to Javier Contreras4
    Expert 2200 points

    Hi Javier,

    I apologise for the delay in replying to you.

    I saw the Figure.26 and Figure.27 in datasheet.

    In these graphs, the Vsense is positive voltage.

    We are supposed to be a momentary negative voltage.

    However, it is up to about -10V.

    If Vsense will be from 0V to -18V , will the output voltage remain 0V and not change?

    If less than a predetermined voltage is no problem, but the troubled that there is such as to reverse at a certain voltage.

    Best regards,

    Tomoaki Yoshida

  • 0 in reply to Tomoaki Yoshida
    TI__Mastermind 32290 points
    Tomoaki,

    Sorry for the delay reply as I was on training and vacation.

    The issue is that with Vsense under 20mV is not desired and will not give the same result from device to device.

    Please take not that that Absolute Maximum ratings for the input common mode are -16V to 80V. Also the Vsense differential voltage max is -18V to 18V.

    Regards,
    Javier