中国半导体行业协会封装分会会刊

中国电子学会电子制造与封装技术分会会刊

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电子与封装 ›› 2022, Vol. 22 ›› Issue (11): 110305 . doi: 10.16257/j.cnki.1681-1070.2022.1105

• 电路与系统 • 上一篇    下一篇

一种低功耗多模式AB类音频放大器的设计

徐凯英;丁宁;孔祥艺;黄立朝   

  1. 中国电子科技集团公司第五十八研究所,江苏 无锡 214035
  • 收稿日期:2022-03-24 出版日期:2022-11-29 发布日期:2022-06-08
  • 作者简介:徐凯英(1994—),男,河南信阳人,硕士,助理工程师,主要研究方向为IC设计。

Design ofa Low Power Multi-Mode Class AB Audio Amplifier

XU Kaiying, DING Ning, KONG Xiangyi, HUANG Lichao   

  1. China ElectronicsTechnology Group Corporation, No.58 Research Institute, Wuxi 214035, China
  • Received:2022-03-24 Online:2022-11-29 Published:2022-06-08

摘要: 音频放大器需要兼容耳机和扬声器2种模式,当AB类功率放大器工作在耳机模式时,主运放关断,仅从运放驱动耳机负载,可有效降低放大器的功耗。改进后的AB类音频放大器扬声器模式输出功率为3 W,耳机模式静态功耗为32.5 mW,耳机负载下功耗显著降低,全模式总谐波失真(THD)为0.02%,失真率低、音效品质高。芯片新增了过流保护模块,能够适应不同的负载环境,在小型电子设备中具有良好的应用前景。

关键词: AB类放大器, 多模式, 低功耗, 过流保护, 低失真

Abstract: An audio amplifier needs to be compatible with both headphone and speaker modes. When a class AB audio amplifier is in the headphone mode, the main operational amplifier is switched off, only slave operational amplifier drives the headphone load, and the power consumption of the amplifier can be significantly decreased. The improved class AB audio amplifier has a speaker mode output power of 3 W, a static power consumption of 32.5 mW in the headphone mode, and a total harmonic distortion (THD) of 0.02% in the two modes. The audio amplifier has low distortion rate and high quality sound. The over-current protect circuit is added to protect the chip in different load conditions, and the chip can be widely used in small electronic devices.

Key words: class AB amplifier, multi-mode, low power, over-current protect, low distortion

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