December 2010

Doc ID 16064 Rev 2

1/29

AN3014

Application note

19 V, 90 W resonant converter with synchronous rectification

using the L6563H, L6599A and SRK2000

Introduction

This application note describes the characteristics and the features of a 90 W demonstration

board (EVL90WADP-LLCSR), tailored to specifications for a typical high-end portable

computer power supply. A peculiarity of this SMPS design is the very high efficiency

in achieving this result is the SRK2000. This synchronous rectification driver for LLC

resonant converters allows significantly reduced secondary-side losses. Thanks to this

improvement, secondary-side heatsinks, which are typically needed for this power range,

can be dramatically reduced or even removed.

Figure 1.

EVL90WADP-LLCSR: 90 W adapter demonstration board

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