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Generate negative output with buck-boost topology

Posted: 03 Feb 2009     Print Version  Bookmark and Share

Keywords:negative output  polarity-inverting  buck-boost 

Electronic circuit designs often require power sources with negative output voltages. There are many different ways of producing a negative output voltage from a positive input voltage. One option is the simple and low cost polarity-inverting (buck-boost) converter. The advantages of this topology are that it requires low component count and that it can be built with standard high-side regulator ICs such as those intended for buck regulators. This article by Frederik Dostal of National Semiconductor discusses the important technical details about the topology including input and output voltage ripple and loop stability requirements, and shows an example circuit.

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