Steady state analysis of hysteretic control buck converters

This paper presents the analysis of a hysteretic control buck converter by means of variable structure system theory because a hysteretic control buck converter is inherently a variable structure system owing to the presence of switching actions. Analysis results show the relationship between the steady state performance and a number of parameters, in particular the output capacitorpsilas ESR. If the ESR is too small, the output voltage ripple will increase significantly and a phase shift is resulted. Although these phenomena are commonly known in the field, there is no analytical result to articulate them.