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
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