Practical Feedback Loop Design Considerations for Switched Mode Power Supplies
نویسنده
چکیده
Negative feedback control is used in switched-mode power supplies to regulate the output at a desired value. The optimum design of the feedback control loop starts with understanding the characteristics of the power stage, which can be analyzed using small-signal modeling. This paper explains the fundamental idea and meaning of small-signal modeling for power supplies and explores the small-signal transfer functions for basic converters and general compensation networks. It also discusses the practical issues with feedback loop design, including characteristics of the opto-coupler, effects of parasitic components, multiple output applications, and loop-gain measurement.
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