AN2644 datasheet(1/64 Pages) STMICROELECTRONICS

Part #	AN2644

Description	An introduction to LLC resonant

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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1 / 64 page

September 2008

Rev 2

1/64

AN2644

Application note

An introduction to LLC resonant

half-bridge converter

Introduction

Although in existence for many years, only recently has the LLC resonant converter, in

particular in its half-bridge implementation, gained in the popularity it certainly deserves. In

many applications, such as flat panel TVs, 85+ ATX PCs or small form factor PCs, where the

requirements on efficiency and power density of their SMPS are getting tougher and

tougher, the LLC resonant half-bridge with its many benefits and very few drawbacks is an

excellent solution. One of the major difficulties that engineers are facing with this topology is

the lack of information concerning the way it operates. The purpose of this application note

is to provide insight into the topology and help familiarize the reader with it, therefore, the

approach is essentially descriptive.

Figure 1.

LLC resonant topology schematics and waveforms

www.st.com

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