My issue is not related with any part. I have a question in the datasheet "slva390". In the datasheet the rms inductor current is derived as Io^2 + ΔI^2/12. Can i know how is this derived. Because the rms of a triangle waveform is ΔI^2/3.
Thank you.
I am not sure exactly were it was derived, but I have seen that same equation in many, many documents. I am sure it is correct. If you start from:
Irms = SQRT ( ((ton +toff)/T) * (Imin * Imax + ((Imax -Imin)^2)/3)
Irms = SQRT ( (1) *(( Iout -ILpp/2) * (Iout+ILpp/2) +((Iout +ILpp/2) - (Iout-ILpp/2))^2) / 3 )
Irms = SQRT( Iout^2 - ((ILpp^2)/4) + (ILpp^2)/3)
Irms = SQRT ( (Io^2) + ((Ilp-p)^2)/12 ), same as the app note.
