Abstract
This chapter discusses an isolated step-down converter, or buck converter, and presents its power stage in the simplest form. Depending on the output loading and the value of filter inductor, the power stage can be operated in two distinctive modes: continuous conduction mode (CCM) and discontinuous conduction mode (DCM). In CCM, the inductor current always stays above zero. In DCM, the current, for a certain duration, stays at zero. In CCM, the power stage alternates between two topologies while, on the contrary, the power stage alternates experiences three topologies in the DCM. There are two techniques for the CCM: graphic based and time-domain based. The chapter discusses the general feature and advantages of a current-mode control scheme. It reveals that the performance merits of current-mode control over voltage-mode control can be appreciated more by looking at the transient response when the converter is subjected to a step-load disturbance or a step-line change.
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