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INA199: application issue

Comi Li
Intellectual 2500 points
Part Number: INA199
Other Parts Discussed in Thread: INA190, INA191, INA186

Hi team,

ASUS now want to use the INA199A3DCKR material and connect the Supply Voltage, IN+, and IN– pins to DC_IN 24V. Calculated based on a tolerance of ±5%, the voltage will reach 25.2V. However, the maximum voltage of

the Supply Voltage, VIN+, and VIN– pins in the datasheet is +26V, is there any risk in using it like this?

BR,

Comi

  • 0
    Guru 257450 points

    As shown in section 6.5, the common-mode input range goes up to 26 V, so this is not a problem.

  • 0
    TI__Expert 3430 points

    Hi Comi,

    Thanks for the question and using the E2E forum.

    Like Clemens points out, the INA199 is designed to work, and is specified, up to a common-mode and power supply voltage of 26V. So no, there's no risk with using the device up to the 25.2V your system reaches (as long as it doesn't exceed the 26V).

    Please let us know if you have any other questions.

    Louis

  • 0 in reply to Louis L
    TI__Intellectual 2500 points

    Hi Louis,

    Thanks for your reply.

    Is there any device with similar structure and functions as INA199A3DCKR, but with higher voltage resistance than INA199A3DCKR?

    BR,

    Comi

  • 0 in reply to Comi Li
    TI__Expert 3430 points

    Comi,

    We have a lot of devices that can withstand a common-mode voltage >26V. For your convenience, I've filtered to those devices here. This table is also filtered down to similar specifications as the INA199, including offset (150uV), gain error (1.5%), quiescent current (100uA).

    Depending on your system requirements, I suggest looking at the INA186, INA190, and/or INA191.

    Please let us know if you have any other questions.

    Louis