Designing DC/DC converters based on SEPIC topology

by Jeff Falin, Senior Applications Engineer, Texas Instruments, Vendor website, Jan 02 2003

Focus:
The single-ended primary-inductance converter (SEPIC) operates from an input voltage that is either above or below its output voltage. However, it requires two inductors which adds to the converter's footprint. Designers can overcome this drawback by using newly available coupled inductors, which combine two inductors in a single package. Not only does the coupled inductor shrink the SEPIC's footprint, it also reduces the inductance needed to achieve the same inductor ripple current as when two separate inductors are used.

What you’ll learn:

• How to design a SEPIC converter using a coupled inductor

Notes:
From Texas Instruments Analog Applications Journal Q4 2008. Although this article brings attention to the use of coupled inductors in SEPIC designs, many of the newer SEPIC design articles take the same approach. See other search results under Search by Topology, SEPIC.

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