AN2941 datasheet(1/37 Pages) STMICROELECTRONICS

Part #	AN2941

Description	This application note describes the characteristics and the features

PDF	37 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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1 / 37 page

November 2010

Doc ID 15447 Rev 4

1/37

AN2941

Application note

19 V - 75 W SMPS compliant with latest ENERGY STAR® criteria

using the L6563S and the L6566A

Introduction

This application note describes the characteristics and the features of a 75 W reference

board (p/n EVL6566A-75WES4), tailored on specifications of a typical high-end portable

computer power supply. The peculiarities of this design are the very high efficiency at light

load and the excellent global efficiency for a two-stage architecture. The high efficiency at

high load is achieved by not using synchronized rectification at the secondary side and

therefore offering a very cost-effective solution.

Efficiency during active-load and light-load operation are compliant with ENERGY STAR®

eligibility criteria for both external (EPA rev. 2.0 EPS) and computer integrated (EPA rev. 4.0

computers) power supply. In addition this design is even compliant with the latest computer

document (EPA rev. 5.0 computers) whose effective date is July 2009.

Figure 1.

L6566A and L6563S-75W ENERGY STAR® compliant adapter

demonstration board (p/n EVL6566A-75WES4)

www.st.com

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