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TPS65400: Fault condition

Hirotsugu Kobayashi
Mastermind 9540 points
Part Number: TPS65400

Hi, team

Buck3 is not output.

The register is as follows. What is the cause?

　78h 0x01, 7Ah 0x10

Is IOUT_OC flag 1 if it detects OCP even once?

Best Regards,

  • 0
    TI__Mastermind 19080 points
    Hi,

    These register values can't provide much information.
    Did you select PAGE=0x02 first?

    2. Yes, the flag will be kept there until you clear it manually.

    Regards,
    Hao
  • 0 in reply to Sam(MPAA) Zhang
    Mastermind 9540 points

    Hi, Hao.

    In the data sheet,

     During the soft-start time for a switcher, all fault signals (OVP, OCP, and UVP) are disabled and reset to the unfaulted condition. The first moment when faults can be triggered is after the end of the soft-start sequence.


    Is it correct that the OCP flag is not set during soft start?
    If at the end of soft start the output voltage has not reached the setting, does OCP and UVP simultaneously flag?
    If the output voltage drops due to Dmax constraints, does the UVP flag go on?

    Best Regards,

  • 0 in reply to Hirotsugu Kobayashi
    TI__Mastermind 19080 points
    Hi,

    1. Yes, OCP flag is not set during soft start.
    2. OC flag and UV flag will be set immediately after soft start if there is OC/UV condition.
    3. UVP flag will be set up as long as Vout is under the UVP threshold, if it touched the Dmax contraints and still not in UVLO, UVP could go on.

    Regards,
    Hao