部分便携式电子产品、部分家庭音视频设备、越来越多的汽车音响系统都已改用D类音频放大器，D类放大器的市场正以50%以上的年增长率在成长。 2008年市场规模将接近6亿美元。

2005-2012年全球D类音频放大器市场规模统计及预测
 
来源：水清木华研究中心

　　手机领域，D类的占有率超过了50%，D类音频放大器常见的有TPA2010D1、TPA2012D2、TPA2005D1、YDA144、YDA1454、TPA4411、TPA6310A2、SAPA1D2。新手机尤其是诺基亚大量采用D类音频放大，并且是双放大，一个是驱动耳机，一个驱动扬声器。电视领域，D类音频放大IC在超过40英寸的平板电视中使用率大约为50%。电视用D类音频放大IC常见的有NeoFidelity的NTP3000，TI的TPA3002、3004、3008。多媒体音箱也有大约15%采用D类音频IC放大，小型家庭影院设备也有D类音频放大的身影，但是市场比较小。

　　大功率后装的汽车音响多采用D类音频放大，因为汽车音响的工作环境恶劣，要求设备耐高温，尽量少产生热量。汽车音响要求高效率，因为它是电池供电系统。汽车音响需要小体积，车内空间有限。日本厂家多采用D类放大，如Alpine，其单独的汽车音响功放都是D类放大。Kenwood的KAC-9104、KAC8104，Pioneer的PRS-D2000SPL、PRS-D1200SPL、PRS-D1200M、PRS-D4200F、PRS-D2200F，也采用了D类放大。美国厂家相对保守，老牌厂家如JBL和 Rockford Fosgate则坚持使用AB类放大。这些汽车音响输出功率都超过50瓦，高的可以近万瓦。不过大功率D类的音质不如AB类，Clarion开发的功放可以在AB类和D类之间转换。不过这些都局限在后装市场，后装（After Sale）市场不及前装市场的1%。

　　手机领域基本上是德州仪器一家独大，电视领域则呈现多极竞争，三星扶植自己的关系企业NeoFidelity，德州仪器在长虹、TCL的电视中大量应用，松下、夏普和索尼则喜欢NXP和ST的产品。老牌的国家半导体衰落了，也许是因为它的AB类太成功了。

Nowadays, some portable electronics, some home audio/video devices and more and more car audio system are changing to the application of class-D audio amplifier. The market of Class-D audio amplifier is growing at a rate of above 50 percent. In 2008, its market size is expected to reach nearly US$600 million.

Statistics and Forecast of Global Class-D Audio Amplifier Market Size 2005-2012

 
Source: ResearchInChina

Class-D audio amplifier applied in handsets accounts for more than 50% of the market share, and it mainly has the following types, TPA2010D1, TPA2012D2, TPA2005D1, YDA144, YDA1454, TPA4411, TPA6310A2, and SAPA1D2. New mobile phones, especially Nokia’s new handsets, apply a large amount of Class-D audio amplifiers, and use a pair of amplifiers, one is headphone driver and the other is loudspeaker driver.

Regarding the television market, utilization ratio of Class-D audio amplifier in flat panel television with screen sizes of above 40 inches is about 50%. Class-D audio amplifiers IC commonly applied in televisions are NeoFidelity’s NTP3000 and TI’s
TPA3002, 3004 and 3008. Around 15% multimedia sound boxes apply Class-D audio amplifier. Small home theater equipment also uses Class-D audio amplifier, but the market is relatively small.

After-market audio with high power mostly adopts Class-D audio amplifier, as the working conditions of auto acoustics are harsh, requiring high temperature resistance and minimum reduction of heat. Besides, auto acoustics require small size, due to limited space in a car. Most of Japanese producers prefer Class-D. For instance, all of Alpine’s acoustics power amplifiers use Class-D, while Kenwood’s KAC-9104 and KAC8104 and Pioneer’s PRS-D2000SPL, PRS-D1200SPL, PRS-D1200M, PRS-D4200F and PRS-D2200F also use Class-D. American manufacturers are relatively conservative, and producers like JBL and Rockford Fosgate still persist in using Class-AB amplifier. The output power of these auto acoustics are all above 50 watts and can be as high as nearly 10,000 watts. Yet, the sound quality of big power Class-D is inferior to that of Class-AB. The power amplifiers developed by Clarion can be converted between Class-AB and Class-D, which are, however, all limited to auto aftermarket that is less than 1% of auto before-market.

Regarding Class-D audio amplifier IC applied in mobile phone, TI possesses the absolutely dominant position in the market. In terms of its application in the television field, the market is carved up by several competitors.
Samsung supports NeoFidelity, which maintains a good relationship with Samsung. TI’s key clients include Changhong and TCL, TV producers in Mainland China, while Panasonic, Sharp and Sony favor products of NXP and ST. The old brand National Semiconductor is declining, maybe because its Class-AB products are too successful.

 第一章 D类音频放大器简介
1.1 D类放大器基本原理
1.2 D类放大器与其它放大器的比较
1.2.1 A类放大器
1.2.2 B类放大器
1.2.3 AB类放大器
1.3 D类音频放大器的优点
1.4 D类音频放大器的缺点以及解决方法
1.4.1 EMI干扰
1.4.2 改善失真
1.4.3 改善频率响应范围和附带失真问题
1.4.4 输出端LPF（低通滤波器）的大电感大电容问题
1.4.5 对电源要求高

第二章 D类音频IC产业现状
2.1 D类音频IC产业与市场简介
2.2 手机用D类音频放大IC实例简介
2.3 非手机领域D类音频IC使用情况
2.3.1平板电视和家庭影院领域
2.3.2、汽车音响

第三章 D类音频放大IC市场
3.1手机市场
3.1.1、中国音乐手机市场
3.2 便携音视频播放器
3.2.1、全球MP3播放机市场
3.2.2、中国MP3播放机市场
3.3 平板电视产业
3.3.1、液晶电视产业
3.4 家用音响系统
3.5 桌面电脑多媒体音箱

第四章 音频IC厂家简介
4.1 YAMAHA
4.1.1公司简介
4.1.2 雅马哈D类放大器产品介绍
4.2 德州仪器
4.2.1 公司介绍
4.2.3 D类音频放大器产品
4.3国家半导体
4.3.1 公司介绍
4.4 Maxim美信
4.4.1公司简介
4.4.2 D类放大器产品
4.5安森美
4.5.1 公司简介
4.5.2 D类放大器产品
4.6 NXP（飞利浦）
4.6.1 公司简介
4.6.2 D类放大器产品
4.7 Microsemi
4.7.1 公司简介
4.7.2 D类放大器产品
4.8 意法半导体ST
4.8.1 公司简介
4.8.2 D类放大器产品
4.9 CIRRUS LOGIC
4.9.1 公司简介
4.9.2 D类放大器产品
4.10 ADI
4.10.1公司简介
4.10.2 D类放大器产品
4.11 WOLFSON
4.11.1公司简介
4.11.2 D类放大器产品
4.12 新日本无线
4.12.1 公司简介
4.12.2 D类音频放大器产品
4.13 ZETEX
4.13.1公司简介
4.13.2 D类音频放大器产品
4.14 演算科技
4.14.1公司简介
4.14.2 D类音频放大器产品
4.15 MONOLITHIC POWER
4.15.1公司简介
4.15.2 D类放大器产品
4.16 震一科技
4.16.1公司简介
4.16.2 D类放大器产品
4.17 龙鼎微电子
4.17.1 公司简介
4.17.2 D类放大器产品
4.18 Tripath
4.18.1公司简介
4.18.2 Tripath 产品简介
4.19、Neofidelity

1 Brief Introduction to Class-D Audio Power Amplifier 
1.1 Basic Principles 
1.2 Comparison between Class-D Amplifier and Other Amplifiers 
1.2.1 Class-A Amplifier 
1.2.2 Class-B Amplifier 
1.2.3 Class-AB Amplifier 
1.3 Merits of Class-D Audio Amplifier 
1.4 Faults of Class-D Audio Amplifier and Its Solutions 
1.4.1 EMI (Electro Magnetic Interference) 
1.4.2 Distortion Improving 
1.4.3 Improvement of Frequency Response Scope and Distortion Problems 
1.4.4 Big Capacitance & Inductance Issues of the Output End LPF 
1.4.5 High Requirement for Power 

2. Class-D Audio IC Industry 
2.1 Brief Introduction to Class D Audio IC Industry and Market 
2.2 Application of Class D Audio Amplifier IC in Mobile Phone 
2.3 Application of Class D Audio Amplifier IC in Non-handset Fields 
2.3.1 Flat Panel TV and Home Theater 
2.3.2 Auto Acoustics 

3. Market of Class D Audio Amplifier IC 
3.1 Mobile Phone Market 
3.1.1 China Music Mobile Phone Market 
3.2 Portable Audio/Video Player 
3.2.1 Global MP3 Player Market 
3.2.2 China’s MP3 Player Market 
3.3 Flat Panel TV Industry 
3.3.1 LCD TV Industry 
3.4 Home Audio System 
3.5 Desktop PC Multimedia Sound Case 

4. Audio IC Manufacturers 
4.1 Yamaha 
4.1.1 Company Profile 
4.1.2 Class-D Amplifier 
4.2 Texas Instruments (TI) 
4.2.1 Company Profile 
4.2.2 Class-D Amplifier 
4.3 National Semiconductor Corporation 
4.3.1 Company Profile 
4.3.2 Class-D Amplifier 
4.4 Maxim 
4.4.1 Company Profile 
4.4.2 Class-D Amplifier 
4.5 ON Semiconductor 
4.5.1 Company profile 
4.5.2 Class-D Amplifier 
4.6 (NXP) Philips
4.6.1 Company profile
4.6.2 Class-D Amplifier
4.7 Microsemi 
4.7.1 Company profile
4.7.2 Class-D Amplifier
4.8 STMicroelectronics
4.8.1 Company profile
4.8.2 Class-D Amplifier
4.9 CIRRUS
4.9.1 Company profile
4.9.2 Class-D Amplifier
4.10 ADI 
4.10.1 Company Profile
4.10.2 Class-D Amplifier
4.11 WOLFSON
4.11.1 Company Profile
4.11.2 Class D Amplifier 
4.12 NJRC
4.12.1 Company Profile
4.12.2 Class D Amplifier
4.13 ZETEX
4.13.1 Company Profile
4.13.2 Class-D Amplifier
4.14 AT CHIP
4.14.1 Company Profile
4.14.2 Product 
4.15 Monolithic Power
4.15.1 Company Profile
4.15.2 Class D Amplifier
4.16 TaiMEC
4.16.1 Company Profile
4.16.2 Class-D Amplifier
4.17 PAM
4.17.1 Company Profile
4.17.2 Class-D Amplifier
4.18 Tripath
4.18.1 Company Profile
4.18.2 Class-D Amplifier
4.19 Neofidelity