Current-Loop Control In Switching Converters Part 6: Slope Compensation

by Dennis Feucht, Innovatia Laboratories, Cayo, Belize, How2Power Today, Feb 29 2012

Focus:
The previous installment of this article presented a refined model of current-mode control that provides a deeper unification of the quasi-static or low-frequency current-loop behavior with the sampling aspects by deriving the dynamics equations for transfer functions from the average current variable rather than the valley current. Here in part 6, the effect of slope compensation is included in the refined model. Specifically, this article analyzes the impact of three different slope-compensation schemes on the refined model, noting similarities and differences in the key waveform equations. It also notes how the refined model with slope compensation compares to earlier models of current-model control. Finally, this article examines the implications of this analysis in terms of establishing guidelines for converter design that ensure loop stability.

What you’ll learn:

• How to understand the effect of slope compensation on Dennis Feucht’s refined model of current-mode control

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