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INA194 output voltage

NAOKI AOYAMA
Guru 11215 points
Other Parts Discussed in Thread: INA194

Hello,

My customer uses the INA194, monitoring a current of 24V supply line.

V+ is 5V, a external comparator trip level is 0.7V.

Power up sequence is as follows.

1. V+ = 5V ON

2. 24V supply line ON

According to the datasheet, output voltage is 1V(max.) before 24V supply line ON.

So, that value is over trip level.

The customer decide to change the power up sequence, has some questions.

Q1) Could you tell me the variation of the OUTPUT voltage due to the process variation?

       It is only mentioned 300mV(typ.) on the datasheet.

Q2) Does it occur any output voltage when V+=0V and VCM is 24V?

Regards,

Naoki Aoyama

  • 0
    TI__Expert 4595 points

    Hello Naoki,
    When Vsense is < 20 mv and Vcm is < 0 V (Device Gnd) or > V+ then the output voltage is typically around 300mV. This is not a tested parameter so we don't have a max number.
    When Vsense is < 20mV and Vcm is between 0V and V+ then Vout can be upto a max of 1V for INA194. Please see Low vsense case 1, 2 and 3 on page 19 and 20 on the datasheet.
    Please let me know if that answers your questions.

  • 0 in reply to Rabab Itarsiwala
    Guru 11215 points
    Hi Rabab,
    Thank you for your reply.
    It is mentioned that Low Vsens Case2 is the least accurate for the INA194 on the datasheet.
    Is Low Vsense Case3 better accurate than Case2?
    If this question is Yes, the output voltage of Case3 is less than 1V. Is it correct?

    Could you tell me about Q2?
    Best Regards,

    Naoki Aoyama