Buck-Boost Converter

  Vin_min / V Vin_max / V  
Vin / V for the calculations
  Vout / V Iout / A f / kHz    
  L / H ΔIL / A for Vin_min  
The values of all input fields can be changed.
The proposed value for L is chosen so that ΔIL=0,4·Iout for >Vin_max.
Tip: The larger the value L, the smaller ΔIL , however this results in a larger physical size of L.
Tip: The higher the switching frequency f, the smaller the inductor L.
Tip: The lowest value of L is achieved if the converter works at the border between continuous and discontinuous mode for Vin_min .
Tip: The higher the frequency  f and the smaller the inductor L, the higher the transistor losses.

By Dr. Heinz Schmidt-Walter, Holger Wenzel, Thomas Zänker, Richard Morgan and Johnalan Kegan.