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TPS25910 CEXT max recommended 47nF

Steve Widener
Genius 10075 points

The max recommended CEXT on the GATE pin is shown as 47nF but the datasheet shows examples of using CEXT/GATE = 0.1uF. Is it ok to use 0.1uF?

If so, what governs the recommended max of 47nF?

Do we need to update the datasheet recommended CEXT/GATE maximum or is there a formula to use for calculating the maximum capacitance based on the output load?

Refn document / revision:

SLUSAR6D – SEPTEMBER 2012–REVISED JANUARY 2014

  • 0
    TI__Guru** 103001 points
    Hi Steve,

    When short circuit fault occurs, GATE is pulled down by a 40-Ω resistor connecting to GND for approximately
    50 μs. So, CEXT needs to be discharged within 50 μs to turnoff the device completely. 47nF discharges in 10 μs. Recommendation in the datasheet is with margin. We can consider values up to 150nF without any concern.

    Regards,
    Rakesh