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INA253-Q1: INA253A3-Q1

Jing He
Prodigy 30 points
Part Number: INA253-Q1
Other Parts Discussed in Thread: INA253

Tool/software:

We want to use INA253 for current sensing, could you pls support to calculate if it can meet our accuracy requirement? thank you. 

Irms : 3.0A

ADC resolution : 12 bit

Vref_ADC : 5.0V

Customer required accuracy : 2%  

  • +1
    TI__Mastermind 31710 points

    Hi,

    The INA253 specification is able to guarantee 0.6% accuracy at room temperature for 3A.

    To meet the resolution requirement, filtering is necessary that is 20kHz or lower. Additional error budget should be allocated to ADC itself.

    Regards,

    Guang

  • +1 in reply to Guang Zhou
    Prodigy 30 points

    could you pls share the HW schematic for your proposal? 

    and do you have the special calculation tool for High temperature ?

  • +1 in reply to Jing He
    TI__Mastermind 31710 points

    Hi,

    To limit bandwidth, the HW solution can be a simple RC filter at the output. For example, 300ohm + 50nF yields ~10kHz.

    We don’t have a special tool for high temp. I did a rough manual calculation for 125˚C, the expected error is about 1.3%. In the future, once the use condition is specified, it will be possible to do a more accurate estimate, but I don’t expect the number to change too much.

    Regards,

    Guang