基于TPA2015設計的高效D類音頻功率放大技術(shù)
加入技術(shù)交流群
本文介紹了TPA2015主要特性，功能方框圖，性能測試框圖以及差分和單端輸入典型應用方框圖，放大器評估板TPA2015D1主要指標，電路圖和材料清單。
TPA2015是TI公司的高效D類音頻功率放大器，采用電池跟蹤SpeakerGuard AGC技術(shù)，并集成了自適應的升壓轉(zhuǎn)換器，能增加低輸出功率的效率。3.6V電源時TPA2015能向8歐姆揚聲器提供2W功率，THD為6%，效率85%。工作電壓2.5V-5.2V，帶自動恢復的熱和短路保護，有三種增益設定：6 dB, 15.5 dB和20 dB，主要用在手機，PDA，GPS，手提電子學和揚聲器。
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 2W 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 5.5V 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應用：
Cell Phones, PDA, GPS
Portable Electronics and Speakers
圖1。TPA2015功能方框圖
圖2。TPA2015測試框圖
圖3。TPA2015差分輸入典型應用方框圖
圖4。TPA2015單端輸入典型應用方框圖
圖5。TPA2015采用外接輸入濾波器降低DAC帶外噪音
音頻功率放大器評估板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.
評估板TPA2015D1指標：
圖6。評估板TPA2015D1 EVM電路圖
評估板TPA2015D1 EVM材清單（BOM）：
圖7。評估板TPA2015D1 PCB布局圖
評論