摘要：在音频领域发展的几十年里，A类，B类，AB类音频功率放大器一直占着主导地位，随着科技的不断发展，音频功率放大器也有了新的研究成果—D类功率放大器。D类功率放大器有很多优点，因为低功耗产生热量较少，节省印制电路板（PCB）面积和成本，并且能够延长便携式系统的电池寿命。D类放大器，是通过控制开关单元的ON/OFF，驱动扬声器的放大器。D类放大器是最近几年才发展起来的，在系统的耐用上以及音频质量等都有了很大的提高。
关键词：D类功率放大器、TDA8922TH、PWM调制、电压开关型驱动电路。
In the audio field for decades, A Class, B Class, AB audio power amplifier has occupied the leading position, with the technology continuous development of the audio power amplifier also has a new research-D power amplifier. Class D power amplifier has many advantages, because the low-power generating less heat, saving printed circuit board (PCB) area and cost, and can extend battery life in portable systems. Class D amplifier, through the control switch unit ON / OFF, the amplifier drives the speaker. Class D amplifier is only developed in recent years, the durability of the system and so on and the audio quality has been greatly improved.
Key words: D power amplifier, TDA8922TH, PWM modulation, the voltage switching drive circuit.
