TI TPA2016D2 D类音频放大方案

       TI 公司的TPA2016D2 是立体声无滤波器的D类音频功率放大器,带有音量控制,动态范围压缩(DRC)和自动增益控制(AGC),5V工作时每路能向8欧姆负载1.7W的功率.器件具有独立的软件关断特性,并提供热保护和短路保护,广泛应用在无线手机和PDA,手提导航设备,手提DVD播放器,笔记本电脑,收音机,游戏机以及智力玩具等.本文介绍了TPA2016D2的主要特性,功能方框图和应用电路以及TPA2016D2EVM评估板电路图和所用元件列表.

       The TPA2016D2 is a stereo, filter-free Class-D audio power amplifier with volume control, dynamic range compression (DRC) and automatic gain control (AGC). It is available in a 2.2 mm x 2.2 mm WCSP package.

       The DRC/AGC function in the TPA2016D2 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. The TPA2016D2 is capable of driving 1.7 W/Ch at 5 V or 750 mW/Ch at 3.6 V into 8 Ω load. The device features independent software shutdown controls for each channel and also provides thermal and short circuit protection.

                                                图1. TPA2016D2外形图

      TPA2016D2 主要特性:

      Filter-Free Class-D Architecture 
      1.7 W/Ch Into 8 Ω at 5 V (10% THD+N) 
      750 mW/Ch Into 8 Ω 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: 3.5 mA 
      Low Shutdown Current: 0.2 µA 
      High PSRR: 80 dB 
      Fast Start-up Time: 5 ms 
      AGC Enable/Disable Function 
      Limiter Enable/Disable Function 
      Short-Circuit and Thermal Protection 
      Space-Saving Package 2,2 mm × 2,2 mm Nano-Free WCSP (YZH)

      应用范围: 
      Wireless or Cellular Handsets and PDAs 
      Portable Navigation Devices 
      Portable DVD Player 
      Notebook PCs 
      Portable Radio 
      Portable Games 
      Educational Toys 
      USB Speakers

图2. TPA2016D2功能方框图



图3. TPA2016D2简化应用电路

        The TPA2016D2 evaluation module (EVM) is a complete, stand-alone audio board. It contains the TPA2016D2 WCSP (YZH) Class-D audio power amplifier.

                                             图4. TPA2016D2EVM评估板电路图

                                      图5.TPA2016D2EVM评估板PCB布层图

表1. TPA2016D2EVM评估板元件列表

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本文来源：TI 公司    作者：

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