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Texas Instruments TPA3221 100W立体声/200W单声道D类放大器

Texas Instruments TPA3221 100W立体声/200W单声道HD模拟输入D类放大器具有待机模式、空闲模式和全功率模式三种工作模式，可实现高效工作。闭环反馈可在整个声频频带内提供低失真，其带宽高达100kHz，可实现出色的音质。其他高效率特性包括：4Ω负载下的输出功率高达2 x 105W，2Ω负载下的输出功率高达1 x 208W；可在AD或低空闲电流HEAD（高效AD模式）调制模式下工作。由于采用单端或差分模拟输入接口，因此该器件支持18dB、24dB、30dB和34dB四种可选增益。通过使用70mΩ MOSFET（经过优化的栅极驱动方案以及低功耗工作模式），TPA3221还可提供>90％的效率、低空闲功耗 (<0.25W) 和超低待机功耗 (<0.1W)。TPA3221包含可轻松集成到单电源系统中的内置LDO，并集成了各类必要的保护功能，因此可简化设计。这些功能包括欠压、过压、逐周期电流限制、短路、限幅检测、过热警告和关断以及直流扬声器保护。

Due to the single-ended or differential analog-input interface, the device supports four selectable gains of 18dB, 24dB, 30dB, and 34dB. The TPA3221 additionally delivers >90% efficiency, low idle power (<0.25W), and ultra-low standby power (<0.1W). This is made possible using 70mΩ MOSFETs, an optimized gate drive scheme, and low-power operating modes.

The TPA3221 simplifies the design by including a built-in LDO for easy integration in single-power-supply systems and integrating essential protection features. These features include undervoltage, overvoltage, cycle-by-cycle current limit, short circuit, clipping detection, over-temperature warning, and shutdown, as well as DC speaker protection.

特性

  • Wide 7V to 30V supply voltage operation
  • Stereo (2 x BTL) and mono (1 x PBTL) operation
  • Output power at 10% THD+N
    • 105W Stereo into 4Ω in BTL configuration
    • 112W Stereo into 3Ω in BTL configuration
    • 208W Mono into 2Ω in PBTL configuration
  • Output power at 1% THD+N
    • 88W Stereo into 4Ω in BTL configuration
    • 100W Stereo into 3Ω in BTL configuration
    • 170W Mono into 2Ω in PBTL configuration
  • 5V Gate drive or built-in LDO for optional single-supply operation
  • Integrated protection: undervoltage, overvoltage, cycle-by-cycle current limit, short circuit, clipping detection, over-temperature warning and shutdown, and DC speaker protection
  • 90% Efficient class-D operation (4Ω)
  • Closed-loop feedback design
    • Signal bandwidth up to 100kHz for high-frequency content from HD sources
    • 0.02% THD+N at 1W into 4Ω
    • 60dB PSRR (BTL, No input signal)
    • <75µV Output noise (A-weighted)
    • >108dB SNR (A-weighted)
    • AD or HEAD Modulation schemes
  • Low-power operating modes
    • Standby modes: mute and <1mA shutdown
    • Low idle-current HEAD modulation scheme
    • Single-channel BTL operation
  • Multiple input options to simplify pre-amp design
    • Differential or single-ended analog inputs
    • 18dB, 24dB, 30dB, 34dB Selectable gains
  • Pin-compatible family of devices with voltage and power-level options

Simplified Schematic

原理图 - Texas Instruments TPA3221 100W立体声/200W单声道D类放大器
发布日期: 2017-12-07 | 更新日期: 2022-07-15