Streamlining Synchronous Buck-Boost Converter Design

by Timothy Hegarty, Texas Instruments, Phoenix, Ariz, How2Power Today, Mar 13 2015

Focus:
Buck-boost conversion is essential across numerous applications including battery charging, solid-state lighting, industrial computing, and automotive. This article offers a brief review of many factors associated with four-switch buck-boost converter designs. It specifically addresses component selection and power loss calculations, and pulls from a quick-start calculator tool to coordinate and accelerate converter design flow. The particular design example presented here is based on the LM5175 buck-boost controller, which employs a unique scheme in buck-boost mode whereby both buck and boost legs switch at reduced frequency in quasi-interleaved manner, providing substantive advantages for efficiency and power loss. A step-by-step design procedure using TI’s quick-start calculator tool is described.

What you’ll learn:

• How to design a four-switch synchronous buck-boost converter with improved efficiency using the LM5175 controller
• How to design a four-switch buck-boost converter based on the LM5175 controller using TI’s design tool

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