摘要:
This application report investigates reducing and eliminating the LC output filter traditionally used in class-D audio power amplifier applications. The filter can be completely eliminated if the designer is using a predominatly inductive speaker; however, the supply current and the EMI are higher than if using the full second-order Butterworth low-pass filter. The designer can use half of the components in the originally recommended second-order Butterworth low-pass filter. The half and no filter class-D applications outperform the full second-order Butterworth filter in total harmonic distortion plus noise (THD+N) and intermodulation distortion (IMD). This document shows speaker requirements with and without a filter, fidelity and electromagnetic interference (EMI) results, and indicates what type of filter fits various system requirements.
本应用报告调查减少和消除传统的D类音频功率放大器应用LC输出滤波器。过滤器可以完全消除,如果设计师使用predominatly感性的扬声器;然而,供应电流和EMI高于如果使用完整的二阶巴特沃斯低通滤波器。设计者可以使用原先建议的第二阶巴特沃斯低通滤波器元件的一半。该文件显示扬声器和结果没有一个过滤器,高保真和电磁干扰(EMI)的要求,并表示什么类型的过滤器适合各种不同的系统要求。
文档:sloa023.pdf
链接:http://www.ti.com.cn/general/cn/docs/litabsmultiplefilelist.tsp?literatureNumber=sloa023
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