Abstract

Control methods for DC/DC converters can be simply classified into three types: current-mode control, voltage-mode control, and ripple-based control. This chapter reviews the basic ripple-based control topologies reveals the characteristics of each technique, including their advantages and disadvantages. Ripple-based control commonly refers to DC/DC converters that use output voltage ripple information to compare with the reference voltage and control power switches on/off to determine adequate power delivery paths. The preliminary design presents the operation principle and stability analysis. on-time control is the most popular nowadays because the converter with on-time control features a fast transient and high efficiency. Several techniques are introduced to improve the regulation performance, including electromagnetic interference reduction, output voltage ripple reduction, and line/load regulation improvement. Finally, the bootstrap architecture, which is more adequate for high input voltage, is presented for high-power applications.

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