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TPS22917: SRon information when 0pF <Ct <400pF

Conor
Guru 12000 points
Part Number: TPS22917

Hi, 

Is there SRon information when 0pF <Ct <400pF is set?

Also, with VIN 1.0V, can SRon be higher than 3.9mV/us?

Thanks,

Astro

  • 0
    TI__Expert 4260 points

    Hi Astro,

    You can use the equation given below in order to find the desired SRon. Please do note that this was an equation that was calculated using interpolation of data. This is an estimation. This is just a typical value of SRon that you will get, using an equation derived through estimation. You can use this equation for capacitor values between 0 pF – 400 pF at 1 V.

    Equation :         SRON = -0.0032 (CT) + 3.9375

    With respect to the second question, the value mentioned in the datasheet is a typical value of SRon. So, it is possible for the SRon to be higher than the typical value.

    Thanks,
    Dhanya              

  • 0 in reply to Dhanyasree Prem Sankar
    Guru 12000 points

    Hi, Dhanya

    Dhanyasree Prem Sankar said:
    Equation :         SRON = -0.0032 (CT) + 3.9375

    From the formula you taught me, I understand that even if I adjust Ct, SRon cannot be made larger than 3.9375.

    Is this perception correct?

    Thanks,

    Astro

  • 0 in reply to Conor
    TI__Expert 4260 points

    Hi Astro, 

    As mentioned in the reply earlier, this is an estimated equation. So, you can expect +/- variation since this is an estimated equation. It is true that you cannot make the slew rate larger than the open condition, however, it is not guaranteed that 3.9375 is the largest SRon, and you can expect some variation. 

    This equation that has been provided is for capacitor values of 0 pF < CT < 400 pF. 

    If you are using a capacitor value of 0 pF, use the slew rate listed in the datasheet. 

    If you are using a capacitor value of 400 pF, use the value of 1100 for the SRon. 

    Thanks, 

    Dhanya