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TPS1H100-Q1: TPS4H160/1H100 dk/K specs test set up

Michael Huang3
Intellectual 2460 points
Part Number: TPS1H100-Q1

Hi team,

My customer wants to know how we set up the measurement for dK/K. They want to know the test condition.

What I understand is we need to test it with a smaller enough resistor and make Vcs <4V, in the linear range. Could you provide more detailed test condition and set up about this spec.

And can I think this is the total error for current sensing, if the Rcs is a ideal precise resistor. If the current is 1A, dK/K is 3%, K is 500. Then the Ics will be 1/500*(1+0.03) or 1/500*(1-0.03)? If there is any other specs affect the accuracy, feel free to let me know.

Best Regards

Michael 

  • 0
    TI__Mastermind 28200 points

    Hello,

    Current sense ratio Kcs = IOUT/Ics, where IOUT is the load current and Ics is the sourcuing CS pin sourcing current. Ics can be measured by pulling down a precise resistor Rcs from CS pin to GND and Kcs = IOUT x Rcs/Vcs. The expectation is the ideal value Ksc(ideal) = 500. The measured value Kcs(meas) is different from 500 and the tolerance can be calculated from the difference dK/K = [Kcs(ideal) - Kcs(meas)]/Kcs(ideal). Multiplying this value by 100 is the tolerance %.

    Regards