Boost Regulator Makes Low Profile SEPIC with Both Step-Up and Step-Down Capability - Design Note 317

Focus:

Flyback and SEPIC converters are popular single-switch solutions for applications where input voltage varies above and below the output voltage. But both topologies usually employ a transformer which may be too tall for space-constrained applications.An alternative approach uses two low-profile inductors together with a SEPIC coupling capacitor that acts like a transformer core, transferring energy between the inductors. In addition to the height benefit, this approach simplifies magnetic component selection versus a conventional SEPIC or flyback.

What you’ll learn:

• How to build a low-profile (3-mm) SEPIC converter based on the LT1961 boost converter IC

Notes:

From Linear Technology Design Notes. 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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Author & Publication:

Keith Szolusha, Linear Technology, Vendor website, Aug 01 2003

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