TPA3221 100W(立体声)200W(单路)HD音频D类放大器解决方案

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TPA3221 100W(立体声)200W(单路)HD音频D类放大器解决方案

文章来源：永阜康科技更新时间：2018/11/23 10:03:00

TI公司的TPA3221是大功率D类放大器,具有带宽高达100kHz的闭环负反馈,提供音频带的低失真和极好的音频质量,器件工作在AD或低空载电流HEAD(高效AD模式)调制,能对4欧姆负载提供2x105W或对2欧姆负载提供1x208W功率.器件具有单端或差分模拟输入接口,四种可选择增益:18 dB, 24 dB, 30 dB和34 dB,主要用在无线和加电扬声器,条形音箱,超低音音箱,书架立体声系统和专业与公共地址（PA）扬声器.本文介绍了TPA3221主要特性,框图和系统框图,以及TPA3221评估模块主要特性,电路图,材料清单和PCB设计图.
TPA3221 is a high-power Class-D amplifier thatenables efficient operation at full-power, idle andstandby. The device features closed-loop feedbackwith a bandwidth up to 100 kHz, which provides lowdistortion across the audio band and deliversexcellent sound quality. The device operates witheither AD or low idle-current HEAD (High Efficient AD mode) modulation, and can drive up to 2 x 105 W into4-Ω load or 1 x 208 W into 2-Ω load.
The TPA3221 features a single-ended or differentialanalog-input interface that supports up to 2 VRMS withfour selectable gains: 18 dB, 24 dB, 30 dB and 34dB. The TPA3221 also achieves >90% efficiency, lowidle power (<0.25 W) and ultra-low standby power(<0.1 W). This is made possible through the use of70-mΩ MOSFETs, an optimized gate drive schemeand low-power operating modes. TPA3221 includes abuilt-in LDO for easy integration in single-powersupplysystems. To further simplify the design, thedevice integrates essential protection featuresincluding undervoltage, overvoltage, cycle-by-cyclecurrent limit, short circuit, clipping detection,overtemperature warning and shutdown, as well asDC speaker protection.

TPA3221主要特性:
• Wide 7-V to 30-V Supply Voltage Operation
• Stereo (2 x BTL) and Mono (1 x PBTL) Operation
• Output Power at 10% THD+N
– 105-W Stereo into 4 Ω in BTL Configuration
– 112-W Stereo into 3 Ω in BTL Configuration
– 208-W Mono into 2 Ω in PBTL Configuration
• Output Power at 1% THD+N
– 88-W Stereo into 4 Ω in BTL Configuration
– 100-W Stereo into 3 Ω in BTL Configuration
– 170-W Mono into 2 Ω in PBTL Configuration
• 5-V Gate Drive or Built-in LDO for Optional Single-Supply Operation
• Closed-Loop Feedback Design
– Signal Bandwidth up to 100 kHz for High-Frequency Content From HD Sources
– 0.02% THD+N at 1 W into 4 Ω
– 60-dB PSRR (BTL, No Input Signal)
– <75-μV Output Noise (A-Weighted)
– >108-dB SNR (A-Weighted)
– AD or HEAD Modulation Schemes
• Low-Power Operating Modes
– Standby Modes: Mute and < 1 mA 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
– Selectable Gains: 18 dB, 24 dB, 30 dB, 34 dB
• Integrated Protection: Undervoltage, Overvoltage,Cycle-by-cycle Current Limit, Short Circuit,Clipping Detection, Overtemperature Warning andShutdown, and DC Speaker Protection
• 90% Efficient Class-D Operation (4 Ω)
• Pin-Compatible Family of Devices with Voltageand Power-Level Options

TPA3221应用:
• Wireless and Powered Speakers
• Soundbars
• Subwoofers
• Bookshelf Stereo Systems
• Professional and Public Address (PA) Speakers

图1.TPA3221功能框图

图2.TPA3221简化电路图

图3.TPA3221系统框图

图4.TPA3221差分(2N)AD模式BTL应用电路

图5.TPA3221差分(2N)AD模式PBTL应用电路(1)

图6.TPA3221差分(2N)AD模式PBTL应用电路(2)

TPA3221评估模块

This user ’s guide describes the characteristics, operation, and use of the TPA3221 evaluation module. A complete printed-circuit board (PCB) description, schematic diagram, and bill of materials are also included.