How the lowering the Switching Frequency Affects the Performance of a Buck Converter

[newbie_hs]

May I K now if I reduce the switching frequency ,will the inductor current becomes discontinuous

 

[KlausST]

Hi,

not if you have an infinite size inductance.

Impossible to give good answers with about no information.

Nominal frequency, current, voltages, duty cycle, exact inductance type, schematic .....

Klaus

 

[Easy peasy]

Short answer = yes, all buck converters become discontinuous at light loads, and for lower values of main L

there are many formulae for this online - an easy search

DCM ( discontinuous conduction mode ) has better dynamics than CCM ( continuous CM ) - but higher peak current for the same ave output current. So it is harder on the input caps & output caps

generally higher core losses too - due to the larger flux swings - in the main L, and wire losses due to the AC current.

Good luck designing and building .!

 

[cupoftea]

try it in LTspice as attached