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TPS48111Q1EVM: Accuracy of current sensing feature of TPS48111

Michelle Mathew
Prodigy 190 points
Part Number: TPS48111Q1EVM

Tool/software:

Hi,

In the datasheet, it is mentioned that the gate driver has a current sensing accuracy of +/- 2% at V_SNS of 2mV. Will the accuracy vary across different load and other conditions? If the accuracy is not constant for all values of V_SNS, could you provide a graph that shows how accuracy of current sensing varies for different conditions.

Regards,

Michelle Mathew

  • 0
    TI__Expert 8870 points

    Hi Michelle, 

    The Accuracy of the VIMON can be calculated using equation 12. Here the factors that influence this are the load and the offset voltage. 

    You can see from the equation that the lower the VSNS is the worse the accuracy is. At higher I_load it would be better than 2%. 

    The below graph demonstrates the linearity between the Vimon output and the VSNS

    Thanks, 

    Sarah