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TPS53647: EN and VR_RDY

Russell Wetherley1
Expert 4255 points
Part Number: TPS53647

Hello E2E,

If the part is powered from a 12V input with the enable held low, does the VR_READY output stay inactive (low)?

Once the enable goes high, what is the behavior of the VR_ready pin?

Looking at figures 105 and 106, this appears to be the case.  Are there any cases where this isn't true?

Thanks!

Russell

  • 0
    TI__Expert 4060 points
    Hey Russell,

    VR_RDY will definitely follow enable like Figures 105 and 106 indicate for start up and shutdown. During operation, while enable is high, VR_RDY typically only drops low during over-voltage situations (7.3.17, page 30). Otherwise VR_HOT#, ALERT#, or VR_HOT# cover most faults. If a catastrophic fault occurs, like in Table 6, and the part shuts down then VR_RDY will also go low.

    Cheers,

    Carmen
  • 0
    TI__Expert 5830 points
    Hi Russel,

    If the part is powered from a 12V input with the enable held low, does the VR_READY output stay inactive (low)?
    -- "VR_READY will hold low because EN is low."

    Once the enable goes high, what is the behavior of the VR_ready pin?
    -- "Please find datasheet 6.6 I/O Timing table, VR_RDY will delay ~1ms after DAC settled, that means VOUT reach VBOOT."

    Looking at figures 105 and 106, this appears to be the case. Are there any cases where this isn't true?
    -- "No"

    Thanks
    Chasel