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Original question:

TMCS1101: PSRR error and PSRR of TMCS1101A2U

TMCS1101: maximum RSS total error

Taito Takemura
Intellectual 2520 points
Part Number: TMCS1101

Tool/software:

Hi team,

If we calculate according to the datasheet, it seems that the smaller the input current, the larger the RSS total error will be, but are there any regulations regarding the maximum RSS total error?

When determining the specifications for the current detection unit, my customer ideally wants the error to be within ±5% from 0A to 15A. However, when calculating, the RSS total error exceeds 5% when the input current is less than 3A, so does the error specification need to be changed according to the current value?

Regards,

Taito Takemura

  • 0
    TI__Intellectual 2495 points

    Hi Taito,

    You are correct in saying that the RSS error increases as input current gets smaller.

    To reduce the error at smaller current values you could try calibrating. An easy calibration to do would be to calibrate the offset at room temperature. You could also try to calibrate the offset across temperatures and/or the sensitivity across temperatures.

    Let me know if you have any other questions.

    Best,

    Holly

  • 0 in reply to Holly R
    TI__Intellectual 2520 points

    HI Holly,

    Thank you for your answer.

    I believe that there is no other regulation for maximum RSS at low currents such as 3A other than Figure 10-1, but is this understanding correct? If there are any other regulations, please let me know.

    Regards,

    Taito Takemura

  • 0 in reply to Taito Takemura
    TI__Intellectual 2495 points

    Taito,

    Yes, Figure10-1 is the only regulation we have. Figure 10-1 is generated using the formulas provided in the data sheet.

    Best,

    Holly