Class D Audio Amplifier IC Market Report, 2005-2006

Published by: Research in China

Published: Jan. 1, 2006 - 128 Pages

Table of Contents

1. Brief Introduction of Class D Audio Amplifier

1.1 Basic principle of class D amplifier

1.2 Comparison between class D amplifier and other amplifiers

1.3 Advantages of class D audio amplifier

1.4 Disadvantages and resolutions of class D audio amplifier

1.4.1 EMI

1.4.2 Distortion improvement

1.4.3 Improvement of frequency response range and related distortion problems

1.4.4 Large inductance and capacitance of output LPF

1.4.5 High power requirement

2. Class D Audio IC Industry

2.1 Development of class D audio IC

2.2 Example of class D audio amplifier IC for mobile phone application

2.3 Application status of class D audio amplifier IC

3. Class D Audio Amplifier IC Market

3.1 Music mobile phone market

3.3 Portable audio/video player

3.4 Car audio

3.5 Flat screen television

3.6 Home audio system

3.7 PC Multi-media audio

4. Audio IC Manufacturers

4.1 YAMAHA

4.2 TI

4.3 National Semiconductor

4.4 Maxim

4.5 On Semiconductor

4.6 Philip

4.7 Microsemi

4.8 ST

4.9 CIRRUS

4.10 ADI

4.11 WOLFSON

4.12 New Japan Radio

4.13 ZETEX

4.14 AT CHIP

4.15 Monolithic Power

4.16 SIGMATEL

4.17 Power Analog Microelectronics

4.18 Tripath

Abstract

The theoretical efficiency of class A audio amplifier is 25%, and its real efficiency is about 15-20%; the theoretical efficiency of class B is about 75%; the theoretical efficiency of class AB is about 75% as well with a real efficiency between 50%-70%; the theoretical efficiency of class D is about 100% with a real efficiency of more than 85%. The high efficiency of class D offers lots of advantages, such as power saving, which is quite important for MP3 and music mobile phones. Power saving means longer paying time, and can attract more clients. Another advantage is a smaller heat generation, which can reduce heat management costs. For instance, large power class AB amplifiers usually need radiator, but the as powerful class D amplifiers do not need it.

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