Choose The Right Regulator For The Right Job (Part 2)

by Don Corey, Maxim Integrated, Chelmsford, Mass, How2Power Today, Feb 15 2015

Focus:
Having discussed PWM-based control in part 1, this part 2 continues the discussion of voltage regulator control methods by discussing pulse-frequency modulation (PFM), hysteretic, and constant on-time (COT), the so-called primary methods of control, as well as secondary methods such as pulse-skipping, power-saving mode. It explains how these methods work and where they are best used. The different methods are compared to PWM, and regulator options such as dual PWM/PFM modes are noted. Differences in regulator efficiency in the different modes are highlighted.

What you’ll learn:

• How to understand voltage regulator control options and their tradeoffs
• How to understand when to use PWM versus PFM, hysteretic or constant-on-time based switching regulators
• How to understand the benefits of pulse skipping

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