Small-signal Analysis, Modeling and Design of a Synchronous Buck-Converter in Voltage-Mode Control

Focus:

Although many buck converters use forms of current-mode control, voltage-mode control is gaining popularity in next-generation systems. Voltage-mode control is robust and easy to understand and while its control-loop compensation is more complex than that of peak-current-mode control, voltage-mode control allows better optimization of bandwidth. To help engineers understand and optimize converter design, this 20-page article provides a detailed derivation of the full-order small-signal analysis and modeling of a synchronous buck converter in voltage-mode control. After the transfer functions are derived, they are employed in a simple step-by-step design procedure. A prototype converter is developed and the results are compared with the analysis.

What you’ll learn:

• How to optimize design of synchronous buck converters operating under voltage-mode control
• How to derive the small-signal ac transfer functions for a synchronous buck converter operating under voltage-mode control

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Author & Publication:

Dr. Sunil Akre, Maxim Integrated Products, Sunnyvale, Calif., How2Power Today, Feb 19 2010

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