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Creating a split-rail power supply with a wide input voltage buck regulator

Posted: 28 May 2010     Print Version  Bookmark and Share

Keywords:power supply  voltage buck regulator  negative output 

This application report demonstrates a unique method of generating a positive and negative output power supply using a standard buck regulator—one that maintains good regulation, has excellent cross regulation and can regulate the positive output from a lower input voltage (i.e. boost). The popular method of creating positive and negative voltages from a buck power supply using a coupled inductor or "over-winding" has the disadvantage of needing a minimum load current to have a reasonably regulated auxiliary output.

This document outlines a step-by-step method for designing the split rail power supply. The split rail power supply uses a wide input voltage step-down regulator as an inverting power supply to create the negative supply rail. The positive supply rail is created from a standard, off-the-shelf coupled inductor from Coilcraft.

View the PDF document for more information.

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