Hello,
For choosing capacitor for soft start this is given equation,
Css = (Tss x Iss) / Vref ,
where Vref = Vfb / 0.75
I chose the values Tss = 5ms, Iss = 2.5uA, Vfb = 0.6V and i got Css value as 15.6nF.
But in webench designer it is showing 22nF.
In my design Vin is 12V, Vout is 3.3V, with forced PWM mode using Vset and output discharge is disabled.
Is the Iss and Vfb value which i chose correct?
Regards,
Nachiketh
