An Efficiency Primer for Switch-Mode, DC-DC Converter Power Supplies

Focus:

Tutorial on efficiency in dc-dc converters explains the sources of efficiency losses (power losses) in dc-dc converters, particularly nonisolated point-of-load converters, and explains how to calculate those losses. Using the buck converter as an example, the application note describes how to calculate losses due to switching components such as MOSFETs and diodes, inductors, and capacitors. It provides guidance on choosing these components and selecting operating conditions to minimize their losses and improve converter efficiency. The role of the controller ICs is also discussed including how control techniques such as synchronous rectification and pulse skipping or pulse frequency modulation, and integration of power switches can improve efficiency. Design examples employ Maxim's dc-dc converter ICs.

What you’ll learn:

• How to understand the various sources of power losses in dc-dc converters (also known as switching regulators)
• How to calculate power losses in dc-dc converters

Notes:

Maxim Integrated Products Application Note 4266. Similar material can be found in a two-part article published on the Power Electronics Technology magazine website. See "Switch-Mode Power Supplies for Beginners: An Efficiency Primer " by Daniel Wagner and Roger M. Kenyon at http://powerelectronics.com/spotlight/power_primer/switch-mode-power-supplies-part1-pp0513/index1.html .

View the Source

Author & Publication:

no author specified, Maxim Integrated Products, Vendor website, Dec 23 2008

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