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Design SEPIC-based DC/DC converters

Posted: 09 Feb 2009     Print Version  Bookmark and Share

Keywords:SEPIC  DC/DC-converter  coupled inductors 

The single-ended primary-inductance converter (SEPIC) is a DC/DC-converter topology that provides a positive regulated output voltage from an input voltage that varies from above to below the output voltage. This type of conversion is handy when the designer uses voltages (e.g., 12 V) from an unregulated input power supply such as a low-cost wall wart. Unfortunately, the SEPIC topology is difficult to understand and requires two inductors, making the power supply footprint quite large. Recently, several inductor manufacturers began selling off-the-shelf coupled inductors in a single package at a cost only slightly higher than that of the comparable single inductor. The coupled inductor not only provides a smaller footprint but also, to get the same inductor ripple current, requires only half the inductance required for a SEPIC with two separate inductors. This article by Texas Instruments explains how to design a SEPIC converter with a coupled inductor.

View the PDF document for more information.

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