ST TS4982 2W立体声音频功率放大方案

ST 公司的TS4982 是集成了参考地耳机驱动器的2W立体声音频功率放大器.单电源5V工作,每路能向4欧姆负载输出2W,此时的THD+N为1%, 耳机驱动器能向16欧姆负载输出125mW.主要应用在笔记本电脑和手提音频设备.本文介绍TS4982主要特性, 方框图, 典型应用电路图和外接元件表,以及演示板STEVAL-CCA019V1主要特性和电路图.

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℃) 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 0hm 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典型应用电路图

应用电路图外接元件表:

演示板STEVAL-CCA019V1

2 W stereo audio power amplifier based on the TS4982

The STEVAL-CCA019V1 is a demonstration board designed to help in the characterization of the TS4982, which features a stereo loudspeaker driver and a ground-referenced stereo headphones 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.

A minimum number of external components makes the TS4982 well suited for notebook and other hand-held sound equipment. It also has an internal thermal shutdown (150℃) and output short-circuit protection mechanism. The TS2012 is available in a 4x4 mm QFN20 package.

演示板STEVAL-CCA019V1主要特性:

■ 2 W output power into 4 ohm load per channel

■ 125 mW into 16 0hm 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

RoHS compliant

 
图3.演示板STEVAL-CCA019V1外形图


图4.演示板STEVAL-CCA019V1电路图