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Power Supplies for LED Driving, 2nd Edition by Steve Winder

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Chapter 7

Boost–Buck Converter

Abstract

This chapter describes boost–buck converters. These can either boost or buck the supply voltage, so the load voltage can be higher or lower than the supply voltage. These circuits are often used with battery-powered equipment and have the advantage of continuing to supply a constant current as the battery voltage falls below the LED load voltage. Both Ćuk and single-ended primary inductor converter topologies are described.

Keywords

boost
buck
PWM dimming
hysteretic control
Ćuk
SEPIC

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