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Realize four switch conversion in buck-boost controller

Posted: 17 Jan 2012 ?? ?Print Version ?Bookmark and Share

Keywords:buck-boost controller? MOSFETs? diodes?

National Semiconductor's LM5118 buck-boost controller is a two switch implementation. This means there are two switching MOSFETs and two diodes in the power path. This document provides a basic schematic. Although a converter based on the LM5118 is touted as efficient, there are applications where even greater efficiency is required. By replacing the two diodes with MOSFETs, a fully synchronous four switch version is realized, with corresponding increase in efficiency and only requires a handful of readably available parts. All of the unique mode transition capabilities of the LM5118 are preserved in the four switch version.

View the PDF document for more information.

Originally published by National Semiconductor at as "LM5118 Four Switch Conversion".

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