AN4026 datasheet(1/40 Pages) STMICROELECTRONICS

Part #	AN4026

Description	using the L6563H and L6699

PDF	40 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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1 / 40 page

July 2012

Doc ID 022603 Rev 1

1/40

AN4026

Application note

19 V - 90 W adapter with PFC for laptop computers

using the L6563H and L6699

Introduction

This application note describes the performance of a 90 W, wide-range mains, power-factor

corrected, AC-DC adapter demonstration board. Its electrical specifications are tailored to a

typical hi-end portable computer power adapter.

The architecture is based on a two-stage approach; a front-end PFC pre-regulator based on

the L6563H TM PFC controller and a downstream LLC resonant half bridge converter using

the new L6699 resonant controller. Thanks to the chipset used, the main features of this

design are very high efficiency, compliant with ENERGY STAR® eligibility criteria (EPA rev.

2.0 EPS) and very good efficiency also at light load, and compliance to the new ErP Lot 6

Tier2 requirements. No load input power consumption is very low too, well within the

international regulation limits.

The controller of the LLC stage is the L6699, integrating innovative functions such as self-

adjusting adaptive deadtime, anti-capacitive mode protection and proprietary “safe-start”

procedure preventing hard switching at startup.

Figure 1.

EVL6699-90WADP: 90 W adapter demonstration board

www.st.com

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