This article introduces the main features of TPA2015, functional block diagram, performance test block diagram and differential and single-ended input typical application block diagram, the main indicators of amplifier evaluation board TPA2015D1, circuit diagram and bill of materials.
TPA2015 is TI's high-efficiency Class D audio power amplifier. It uses battery tracking SpeakerGuard AGC technology and integrates an adaptive boost converter to increase the efficiency of low output power. With 3.6V power supply, TPA2015 can provide 2W power to 8-ohm speakers, with THD of 6% and efficiency of 85%. Operating voltage 2.5V-5.2V, with automatic recovery of thermal and short circuit protection, there are three gain settings: 6 dB, 15.5 dB and 20 dB, mainly used in mobile phones, PDA, GPS, portable electronics and speakers.
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 main features:
Built-In SpeakerGuard â„¢ 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 application:
Cell Phones, PDA, GPS
Portable Electronics and Speakers 
figure 1. TPA2015 functional block diagram 
figure 2. TPA2015 test block diagram 
image 3. TPA2015 differential input typical application block diagram 
Figure 4. TPA2015 single-ended input typical application block diagram 
Figure 5. TPA2015 uses an external input filter to reduce DAC out-of-band noise
Audio Power Amplifier Evaluation Board 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.
Evaluation board TPA2015D1 indicators: 
Image 6. Evaluation board TPA2015D1 EVM circuit diagram Evaluation board TPA2015D1 EVM material list (BOM): 
Figure 7. Evaluation board TPA2015D1 PCB layout
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