3W Filterless Class D Audio Amplification Technology Based on TPA2028D1
3W Filterless Class D Audio Amplification Technology Based on TPA2028D1
TI's TPA2028D1 is a mono 3W filterless Class D audio power amplifier with integrated volume control, dynamic range compression (DRC) and automatic gain control (AGC). The DRV / AGC function can be programmed via a digital I2C interface. 5V The power supply can provide 3W power (THD + N is 10%) to a 4 ohm load, the operating voltage is from 2.5 V to 5.5 V, the operating current is 1.8 mA, and the shutdown current is 0.2 uA. It is mainly used in wireless or cellular phones and PDA, PND , DVD players, notebook computers, portable radios and game consoles, and educational toys. This article introduces the main features of TPA2028D1, functional block diagram, indicator test block diagram, and TPA2028D1YZFEVM evaluation board performance, circuit diagram and bill of materials (BOM)
The TPA2028D1 is a mono, filter-free Class-D audio power amplifier with volume control, dynamic range compression (DRC) and automaTIc gain control (AGC). It is available in a 1,63 mm x 1,63 mm wafer chip- scale package (WCSP).
The DRC / AGC funcTIon in the TPA2028D1 is programmable via a digital I2C interface. The DRC / AGC funcTIon can be configured to automatically prevent distortion of the audio signal and enhance quiet passages that are normally not heard. The DRC / AGC can also be configured to protect the speaker from damage at high power levels and compress the dynamic range of music to fit within the dynamic range of the speaker. The gain can be selected from –28 dB to +30 dB in 1-dB steps. 
TPA2028D1 main features:
Fast AGC Start-up Time: 5 ms
Pin-out Compatible with TPA2018D1
Filter-Free Class-D Architecture
3 W Into 4 at 5 V (10% THD + N)
880 mW Into 8 at 3.6 V (10% THD + N)
Power Supply Range: 2.5 V to 5.5 V
Flexible Operation With / Without I2C
Programmable DRC / AGC Parameters
Digital I2C Volume Control
Selectable Gain from –28 dB to 30 dB in 1-dB Steps (when compression is used)
Selectable Attack, Release and Hold Times
4 Selectable Compression Ratios
Low Supply Current: 1.8 mA
Low Shutdown Current: 0.2 µA
High PSRR: 80 dB
AGC Enable / Disable Function
Limiter Enable / Disable Function
Short-Circuit and Thermal Protection
Space-Saving Package
1,63 mm × 1,63 mm Nano-Free WCSP (YZF)
TPA2028D1 application:
• Wireless or Cellular Handsets and PDAs
• Portable Navigation Devices
• Portable DVD Player
• Notebook PCs
• Portable Radio
• Portable Games
• Educational Toys
• USB Speakers 
Figure 1. TPA2028D1 functional block diagram 
Figure 2. TPA2028D1 indicator test block diagram 
Figure 3. TPA2028D1 simplified application block diagram
TPA2028D1YZFEVM Evaluation Board
The TPA2028D1 evaluation module (EVM) is a complete, stand-alone audio board. It contains the TPA2028D1 WCSP (YZF) Class-D audio power amplifier.
TPA2028D1YZFEVM evaluation board indicators: 
Figure 4. TPA2028D1YZFEVM evaluation board outline drawing 
Figure 5. TPA2028D1YZFEVM evaluation board circuit diagram (1) 
Figure 6. TPA2028D1YZFEVM evaluation board circuit diagram (2)
TPA2028D1YZFEVM Evaluation Board Bill of Materials (BOM): 
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