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TPS25942A - about “dvdt over value” of PGOOD function

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Guru 21045 points


Hi Team,

 

We would like to know about “dvdt over value” of PGOOD function.


 

We understand that “dvdt over” is “V(dVdTmax)”.


 

If yes, I understand as follows.

-PGOOD is High if PGTH pin voltage is higher than internal reference V(PGTHR) and “dvdt over” is “V(dVdTmax)”.

-PGOOD is Low if PGTH pin voltage is lower than internal reference V(PGTHR) and “dvdt over” is “V(dVdTmax)”.

-PGOOD is Low if PGTH pin voltage is higher than internal reference V(PGTHR) and “dvdt over” is lower than “V(dVdTmax)”.

-PGOOD is Low if PGTH pin voltage is lower than internal reference V(PGTHR) and “dvdt over” is lower than “V(dVdTmax)”.

 

Is my understanding correct?

 

Regards,

Kanemaru

  • 0
    TI__Guru** 106151 points
    Hi Kanemaru-san,

    "dVdT over" signal is derived from dVdT pin voltage.
    “dVdT over” means the voltage at dVdT pin has crossed (Vin+3)/12, where Vin is the input voltage, 12 is the gain of dVdT and 3 is the minimum over drive voltage required to keep FET in ON state.
    In your description, “dVdT over” has to be replaced by (Vin+3)/12.

    Thanks,
    Rakesh
  • 0 in reply to Rakesh
    Guru 21045 points

    Hi Rakesh-san,

    I’m sorry for the delay in my reply.

    I understand. Thank you very much.

    Regards,

    Kanemaru