Current-Loop Control In Switching Converters Part 7: Fm0 In Models

by Dennis Feucht, Innovatia Laboratories, Cayo, Belize, How2Power Today, Mar 30 2012

Focus:
This article on modeling of current-mode control concludes with a discussion of the PWM factor, Fm0. The refined model of current-mode control presented in part 5 is shown to be compatible with the major existing models when their limiting assumptions are factored in. This discussion refers back to expressions for the three slope-compensation methods derived in part 6. Finally, this lengthy process of modeling the current-loop ends by discussing the advantages and limitations of waveform-based models versus circuit-based models, and why it would be desirable to merge these two approaches.

What you’ll learn:

• How to understand the similarities between existing models of current-mode control and Dennis Feucht’s refined model of current-mode control
• How to understand the advantages and limitations of waveform-based models versus circuit-based models

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