1、 摘要 高保真 功率放大 技术的发展，使整个 音频功率放大 技术领域发生了巨大的变化 。现代人对听觉水平要求越来越高，所以对音响的音质真实性要求越来越多，高保真 音频功率放大技术 克服了这个缺点，它能够如实的反映出声音信号的音色，音高和音强等音质状况本来面貌的能力，同时对声音信号进行必要的修饰和加工，因此，我们这次的研究对象是高保真 功率音质放大技术 ，本文主要介绍 基于 LM1875 D 类音频功率放大电路的设计 ，它在音频应用场合提供非常低的失真度和高质量的音色，还具有了高增益、快速转换速率、宽功率带宽、大输出电压摆幅、大电流能 力和非常宽的电源范围等特性。系统采用大回环电压负反馈控制输出
2、，配以普通双路桥式整流滤波电路，放大器采用内部补偿，增益控制在 22dB 左右。它可用与高品质音频系统、立体声唱机等 等。 关键词 ： LM1875 高保真 功率放大 Abstract High-fidelity audio technology, audio technology, the whole has undergone tremendous changes, which not only combines the audio technology and amplifier technology, modern people increasingly high demand on
3、the hearing level, so the authenticity of the audio sound quality have become increasingly demanding more, high-fidelity sound to overcome this shortcoming, it can honestly reflect the voice signal tone, pitch and sound quality and strong capacity to face the condition, while the sound signal and pr
4、ocessing the necessary modifications, so this time we study is the high-fidelity audio, this article introduces the LM1875 audio amplifier design, which in audio applications with very low distortion and high-quality sound, also has a high gain, fast slew rate, wide power bandwidth, large output vol
5、tage swing, high current capability and very wide supply range and other characteristics. Using large loop negative feedback control voltage output, together with the ordinary two-way bridge rectifier filter circuit, amplifier with internal compensation, gain control is about 26dB. It can be used with high-quality audio systems, stereo player and so on. Key words: LM1875 High-fidelity power amplifier
