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TPS3851: About the difference between theoretical value and actual measured value of CMD PIN

user5088412
Prodigy 85 points
Part Number: TPS3851

When the "CMD" terminal was measured, it was found that there was a discrepancy with the value stated in the data sheet.

Two capacitors (0.047uF, 0.01uF) are connected in parallel to the CMD pin.

<Measured value>

<Theoretical value>

◆Question

The measured voltage is 1.10V, which is different from the theoretical value in the data sheet.

・Do you know the reason for this?

・Also, is there a problem if the theoretical and measured values do not match?

Best Regards,

  • 0
    TI__Genius 9375 points

    Hi user,

    Are you getting a consistent 1.1V regardless of the capacitor used?

    Thanks,
    Abhinav.

  • 0 in reply to Abhinav.Sharma
    Prodigy 85 points

    Hi Abhinav.Sharma,

    Thank you for your quick answer.

    I'm sorry.

    There was a problem with our measurement environment.

    After reviewing the measurement method, the theoretical value and the measured value matched.

    <Re-Measured value>

    Two capacitors (0.047uF, 0.01uF) are connected in parallel to the CMD pin.

    1.24V.

    Even if the capacitor is changed, the theoretical value and the measured value match.

    <Measured value>

    One capacitors (0.01uF) is connected to the CMD pin.

    1.24V.

    Thank you for your cooperation.

    Best Regards,