基于TPA2015设计的高效D类音频功率放大技术

本文介绍了TPA2015主要特性，功能方框图，性能测试框图以及差分和单端输入典型应用方框图，放大器评估板TPA2015D1主要指标，电路图和材料清单。

TPA2015是TI公司的高效D类音频功率放大器，采用电池跟踪SpeakerGuard AGC技术，并集成了自适应的升压转换器，能增加低输出功率的效率。3.6V电源时TPA2015能向8欧姆扬声器提供2W功率，THD为6%，效率85%。工作电压2.5V-5.2V，带自动恢复的热和短路保护，有三种增益设定：6 dB, 15.5 dB和20 dB，主要用在手机，PDA，GPS，手提电子学和扬声器。

The TPA2015D1 is a high efficiency Class-D audio power amplifier with battery-tracking SpeakerGuard AGC technology and an integrated adapTIve boost converter that enhances efficiency at low output power. It drives up to 2 W into an 8  speaker (6% THD). With 85% typical efficiency, the TPA2015D1 helps extend battery life when playing audio.

The built-in boost converter generates a 5.5 V supply voltage for the Class-D amplifier. This provides a louder audio output than a stand-alone amplifier directly connected to the battery. The SpeakerGuardTM AGC adjusts the Class-D gain to limit battery current and prevent heavy clipping.

The TPA2015D1 has an integrated low-pass filter to improve the RF rejecTIon and reduce DAC out-of-band noise, increasing the signal to noise raTIo (SNR).

TPA2015主要特性：

Built-In SpeakerGuard™ Automatic Gain Control (AGC)

with Enhanced Battery Tracking

Limits Battery Current Consumption

Prevents Audio Clipping

2 W into 8  Load From 3.6 V Supply (6% THD)

Integrated Adaptive Boost Converter

Increases Efficiency at Low Output Power

Low Quiescent Current of 1.7 mA from 3.6 V

Operates From 2.5 V to 5.2 V

Thermal and Short-Circuit Protection with Auto Recovery

Three Gain Settings: 6 dB, 15.5 dB, and 20 dB

Independent Control for Boost and Class-D

Pin-to-Pin Compatible with TPA2013D1

Available in 1.954 mm × 1.954 mm 16-ball WCSP Package

TPA2015应用：

Cell Phones, PDA, GPS

Portable Electronics and Speakers

图1。TPA2015功能方框图

图2。TPA2015测试框图

图3。TPA2015差分输入典型应用方框图

图4。TPA2015单端输入典型应用方框图

图5。TPA2015采用外接输入滤波器降低DAC带外噪音

音频功率放大器评估板TPA2015D1

The TPA2015D1 audio power amplifier evaluation module is a complete, stand-alone audio board. It contains the TPA2015D1 WCSP (YZH) Class-D audio power amplifier with an integrated boost converter. All components and the evaluation module are Pb-Free.

评估板TPA2015D1指标：


图6。评估板TPA2015D1 EVM电路图
评估板TPA2015D1 EVM材清单（BOM）：



图7。评估板TPA2015D1 PCB布局图