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TPS22995: CT pin capacitor calculation

Muthuvel K
Prodigy 50 points
Part Number: TPS22995


Tool/software:

Hi,

if iam calculate TR using vin 3.3 CT as 0 not getting above value 72.2us

in my case VIN is 3.3 and CT is 2200pf getting 58.6s 

is it correct?

  • 0
    TI__Mastermind 37401 points

    Hello Muthuvel,

    Data in the table are obtained from characterizations of the device.

    The equation is given to get the estimated value.

    Thanks

    Amrit 

  • 0 in reply to Amrit Jit
    Prodigy 50 points

    Hi Amrit,


    We calculated the rise time using the datasheet equation it gives 
    calculated values:-
    CT=0,VIN=3.3 Tr=58.6S
    is this correct?
    if we use 0pf this much of seconds to reach saturation point..
    thanks,
    muthuvel k
  • 0 in reply to Muthuvel K
    Prodigy 50 points

    Hi Amrit,

    CT=0,VIN=58.6s

    When the equation is applied, we obtain tr=58.6S; but, the same number(CT=0) for the table indicates 72.2 µs.

    which one we should follow table value or calculated value?

    thanks,

    Muthuvel k

  • 0 in reply to Muthuvel K
    TI__Mastermind 37401 points

    Hello Nuthuvel,

    The data on table are obtained from characterization of IC.

    Equation is provided to find an approximated rise time value for CT, VIN which are not present in table.

    Thanks

    Amrit 

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