Tapped Inductors Enable Simple, Compact Buck-Boost Converters With Single Noninverting Or Dual, Complementary Outputs

Focus:

Nonisolated buck-boost converters with positive output polarity find use in industrial, automotive and low- and medium-voltage battery systems, among others. These systems must not only be efficient, they must also be as compact and power dense as possible. Traditional approaches such as SEPIC, four-switch buck boost or transformer-based topologies including flyback, forward and push-pull can provide a solution but may require added size, complexity or losses. This article introduces and analyzes a tap-to-ground tapped-inductor buck-boost architecture that offers compact size, uncomplicated design and the flexibility to generate a single output or dual complementary rails. Implementations of such converters based on the LM5085 constant on-time controller and the LM22670 monolithic switching regulator are described.

What you’ll learn:

• How to implement simple buck-boost converters with single or dual complementary outputs
• How to understand tradeoffs of various topologies used to implement buck-boost converters
• How to understand benefits of tapped-inductor architectures

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Author & Publication:

Hector F. Arroyo, National Semiconductor, San Diego, Calif., How2Power Today, Jun 24 2011

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