原标题：ST TS4982 2W立体声3D效果放大方案

　　ST 公司的TS4982是带参考地耳机驱动器的 2W立体声功率放大器，每路可向4欧姆负载输出2W功率，参考地耳机驱动器可向16欧姆输出125mW功率，四级增益设定，3D音响效果，主要应用在便携式/笔记本电脑和手提音频设备。本文介绍了TS4982的主要特性，方框图以及典型应用电路和所用外接元件列表。

　　TS4982 2 W stereo audio power amplifier with ground-referenced headphone driver

　　The TS4982 features a stereo loudspeaker driver and a ground-referenced stereo headphone driver. An independent standby mode pin allows the TS4982 to simultaneously drive both output drivers. Operating on a single 5 V supply, the TS4982 delivers 2 W (typ.) output power into a 4 ohm load at 1% THD+N.

　　The TS4982 features a PC beep input, three levels of 3D stereo enhancement and 4-step gain control using two digital input pins. Minimum external components make the TS4982 wellsuited for notebook and other hand-held sound equipment. It also has an internal thermal shutdown (150° C) and output short circuit protection mechanism.

　　TS4982主要特性：

　　■ 2 W output power into 4 ohm load per channel

　　■ 125 mW into 16 ohm load ground-referenced stereo headphone driver

　　■ Four-step gain settings on speaker path

　　■ 3 levels of 3D effect on speaker path

　　■ PC-beep input system detection

　　■ 8 kV HBM ESD-protected headphone outputs

　　■ Pop and click reduction circuitry

　　■ 32-pin 5 x 5 mm QFN package

　　■ Thermal shutdown and output short-circuit protection(a)

　　TS4982应用：

　　■ Laptop/notebook computers

　　■ Portable audio devices

　　图1。TS4982方框图

　　图2。TS4982典型应用电路

　　应用电路外接元件表：