I am trying to use a non-synchronous buck converter with closed-loop voltage control for battery charging applications.
It needs to work in a wide operating range:
- Input voltage from 12V to 25V
- Output voltage from 3V to 8.5V
- Output current from 0 to 2.5A
Usually buck converters are calculated for a single operating point. How could I calculate the inductor and the input and output capacitors to optimize the efficiency of the converter in this wide range?
Maybe should I define a maximum value for the inductor ripple current? I think it is useless to use a high value inductor, anyway for low output currents is not possible avoid working in discontinuous mode.