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TPS65381-Q1: What could happen if a too small VDD6 output capacitor is used?

Thomas Kofoed-Hansen
Prodigy 20 points
Part Number: TPS65381-Q1

The datasheet strongly indicates that the is a min and max size of the VDD6 output capacity and that is essential too also consider DC-bias derating.

But what will happen if this capacitor is chosen too small (Will it damage the regulator, will it not start-up)?

I'm investigating why some boards won't start-up, and if this might have an influence.

  • 0
    TI__Genius 12735 points

    Hi Thomas,

    If there is not a sufficient amount of output capacitance with the Series resistor in place on the output of VDD6 the device control loop will likely be unstable and the board VDD6 will exhibit strange switching that is not expected and you will see regulation issues. I have not previously seen this issue damage a device before but it may be possible to damage the device if too much current is drawn if there was no output capacitance on VDD6 but this would be unlikely still.

    Best regards,

    Layne J