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TPS65311-Q1: Overcurrent protection

Part Number: TPS65311-Q1

Hi,

How long does it take from detection of over-current condition to validating fail-safe on BUCK2/3, Boost SMPS?

Could you share the timing chart from above detection to return?

Best Regards,

Kuramochi

  • Hi Kuramochi-san,

    I've assigned this post to the appropriate applications engineer, he will respond to your question.

    Regards,
    Karl
  • Hi Kuramochi-san,

    BUCK2/3 and Boost have current limit function for own protection and these current limits do not generate reset event by itself. Page-22 of the datasheet explains the way current limit works. If current limit is detected for 5 consecutive cycles, low side PWM is turned on for 16 clock cycles. This may sometimes generate under voltage detection on the particular regulator to generate UV reset event as only low side is turned on for 16 clock cycles. But timing of UV detection on these regulators due to over current limit is totally dependent on the application conditions and we cannot give any timing diagram for this.

    However BUCK1 over current detection generates the reset event immediately.

    Hope this helps you.

    Regards,

    Murthy

  • Murthy-san,

    Thank you for your help.

    What is the reference clock of "5 consecutive cycles" and "16 clock cycles"?
    Is it switching frequency?

    Best Regards,
    Kuramochi
  • Hello Kuramochi-san,

    Yes. clock cycle here means switching frequency/period.

    I will shortly send you some waveforms showing the behavior through separate email.

    Regards,

    Murthy