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TPS546D24A: What is the power good delay time??

Alex Yeh
Expert 5425 points
Part Number: TPS546D24A
Other Parts Discussed in Thread: TPS54821, , TPS54326

Hi team,

Could you help to check what is the power good delay time for TPS54821、TPS54326 and TPS546D24A? Thanks.

It can't be found on datasheet.

Thanks.

Regards,

Alex

  • 0
    TI__Guru 56925 points

     

    There can be two different delays for "PGOOD Delay" depending on what you are referring to.

    At Start-up, these devices including the soft-start function as part of the PGOOD processing.  During start-up, all of the devices will wait until after the internal soft-start function has completed before they release PGOOD to rise.

    The TPS546D24A will add a 20-50 microsecond delay after soft-start completes before releasing PGOOD even if the output voltage entered the PGOOD window prior to completing soft-start.  Once Soft-start completes, the TPS546D24A will force PGOOD low 2 PMW clock-cycles after detecting the output voltage outside of the PGOOD window.

    The TPS54326 will wait 0.7x the soft-start time after soft-start completes before releasing the PGOOD pin to rise.  If the output voltage drops below 85% of the programmed output voltage, PGOOD will assert low after a 10 microsecond internal delay. 

    The TPS54821 will wait until the soft-start pin voltage is above 1.4V before releasing the PWRGD pin.  Once soft-start is completed and PGOOD is high, PGOOD will be pulled low after approximately a 10 micro-second delay.