Charger

TND317/D Rev. 4, Jul-06

90 W Notebook AC-DC Adapter Reference Design Documentation Package

Semiconductor Components Industries, LLC, 2006 July, 2006 – Rev 4

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TND317/D

© 2006 ON Semiconductor. Disclaimer: ON Semiconductor is providing this reference design documentation package “AS IS” and the recipient assumes all risk associated with the use and/or commercialization of this design package. No licenses to ON Semiconductor’s or any third party’s Intellectual Property is conveyed by the transfer of this documentation. This reference design documentation package is provided only to assist the customers in evaluation and feasibility assessment of the reference design. It is expected that users may make further refinements to meet specific performance goals.

Semiconductor Components Industries, LLC, 2006 July, 2006 – Rev 4

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TND317/D

Overview

This reference document describes a built-and-tested, GreenPointTM solution for a Notebook Ac-Dc adapter. The reference design circuit consists of one single-sided printed circuit board designed to fit into a standard notebook adapter plastic case. As shown in Figure 1, the reference design offers a simplified notebook adapter power supply solution, where by judicious choice of design tradeoffs, optimum performance is achieved at minimum cost.

Figure 1

Semiconductor Components Industries, LLC, 2006 July, 2006 – Rev 4

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1 Introduction

In a not too distant past, the power requirements of notebooks adapters were in the 50-70 W range but lately they have risen over the 100 W levels. One can see a two-fold growth in power requirements: • Notebook computers functionality becomes richer, so the power demand scales up. • Battery capacity (or density) increases, thus the charging requirements also go up. Crossing the threshold of 75 W input has significant consequences. In effect, 75 W is the power threshold beyond which the regulation (IEC1000-3-2) for the reduction of harmonic...