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[原创] TI TAS5825M 38W立体声数字输入D类音频放大器解决方案

关键词:消费类电子 D类音频放大器 扬声器

时间:2018-12-17 09:34:45       作者:TI       来源:中电网

TI公司的TAS5825M是4.5V-26V 38W立体声数字输入D类音频放大器,集成了高达192kHz架构的音频处理器,功能强大的音频DSP核支持几种先进音频处理流,采用48kHz或96kHz架构,集成的取样速率转换器(SRC)检测输入取样速率变化,支持32, 44.1, 48, 88.2, 96, 192 kHz取样速率,3线数字音频接口,功率效率大于90%,在PVDD=12V是静态电流小于20A,支持多种输出配置,主要用于DTV, HDTV, UHD和多种用处监视器,条形音箱和超低音音箱,笔记本/PC扬声器,无线/蓝牙扬声器以及智能扬声器.本文介绍了TAS5825M主要特性,功能框图,应用电路以及评估模块TAS5825MEVM主要特性,电路图,材料清单和PCB设计图.

The TAS5825M is a stereo high-performance closedloopClass-D with integrated audio processor with upto 192-kHz architecture.

The powerful audio DSP core supports severaladvanced audio process flows. With 48-kHz or 96-kHz architecture, an integrated SRC (Sample rateconvertor) detects the input sample rate change.

Then auto converts to the target sample rate whichDSP is running to avoid any audio artifacts. Theseprocess flows support: 2×15 BQs, 3-Band DRC,FullbandAGL (Automatic Gain Limiter), Smart AmplifierAlgorithm (Thermal and Excursion Protection), Bassenhancement, Spatializer,THD manager, PVDDTracking and Thermal Foldback. The 192-kHzprocess flow offers Full-band AGL and ThermalFoldback .

TAS5825M主要特性:

1• Flexible Audio I/O:
– Supports 32, 44.1, 48, 88.2, 96, 192 kHzSample Rates
– I2S, LJ, RJ, TDM, SDOUT for AudioMonitoring, Sub-Channel or Echo Cancellation
– Supports 3-Wire Digital Audio Interface (NoMCLK Required)
• High-Efficiency Class-D Operation
– > 90% Power Efficiency, 90 mΩRDSon
– Low Quiescent Current, <20 mA at PVDD=12V
• Supports Multiple Output Configurations
– 1 × 53 W, 1.0 Mode (4-Ω, 22V, THD+N=1%)
– 1 × 65 W, 1.0 Mode (4-Ω, 22V, THD+N=10%)
– 2 × 30 W, 2.0 Mode (8-Ω, 24 V, THD+N=1%)
– 2 × 38 W, 2.0 Mode (8-Ω, 24 V, THD+N=10%)
• Excellent Audio Performance:
– THD+N ≤ 0.03% at 1 W, 1 kHz, PVDD = 12 V
– SNR ≥ 110 dB (A-weighted), ICN ≤ 35 μVRMS
• Flexible Processing Features
– 3-Band Advanced DRC + AGL,2 × 15 BQs,
– Sound Field Spatializer (SFS), Level Meter
– 96-kHz, 192-kHz Processor Sampling
– Dynamic EQ, Smart Amplifier Algorithm forBass Enhancement and SpeakerThermal/Excursion Protection
• Flexible Power Supply Configurations
– PVDD: 4.5 V to 26.4 V
– DVDD and I/O: 1.8 V or 3.3 V
• Excellent Integrated self-protection:
– Over-Current Error (OCE)
– Cycle-By-Cycle Current Limit
– Over-Temperature Warning (OTW)
– Over-Temperature Error (OTE)
– Under/Over-Voltage Lock-out (UVLO/OVLO)
• Easy System Integration
– I2C Software Control
– Reduced Solution Size
– Small 5 x 5 mm Package
– Fewer Passives Required Compared toOpen-loop Devices
– No Bulky Electrolytic Capacitors or LargeInductors Required for most Applications

TAS5825M应用:

• DTV, HDTV,UHD and Multi-Purpose Monitors
• Soundbars and Subwoofers, Notebooks/PC Speakers
• Wireless/Bluetooth Speakers
• Smart Speakers (with Voice Assistant)

图1.TAS5825M功能框图

图2.TAS5825M 2.0(Stereo BTL)系统应用电路图

图3.TAS5825M超低音(PBTL)应用电路图

图4.TAS5825M 2.1(2.1CH两个TAS5825M)应用电路图

TAS5825M评估模块TAS5825MEVM

This user’s guide describes the operation of the TAS5825M Evaluation Module (EVM). The EVM isconnected to the PurePath™ Console Motherboard (PPCMB).

The main contents of this document are:

• Hardware descriptions and implementation Required equipment and accessories:
• TAS5825MEVM
• PurePath Console Motherboard
• A USB micro type-B cable
• Power supply unit (PSU)
• Speakers and cables
• Desktop or laptop running Microsoft® Windows® 7, Windows 8, or Windows 8.1
• Audio source: This can be a DVD player with appropriate SPDIF cable or Playback Media from Windows 7, Windows 8 or Windows 8.1.

The TAS5825MEVM showcases the latest TI digital input Class-D closed-loop amplifier. The TAS5825M isa digital input Class-D audio amplifier with 96-kHz, and 192-kHz extended processing. The EVM is used inconjunction with the PurePath Console Motherboard (PPCMB). The PVDD supply is provided via theTAS5825MEVM and is regulated to 5 VDC and 3.3 VDC on the PPCMB. The PPCMB providesthe I2S, I2C, and 3.3 VDC to the TAS5825MEVM.


图5.评估模块TAS5825MEVM外形图

评估模块TAS5825MEVM主要特性:

• 96-kHz or 192-kHz input sample rate support
• 2.0, mono and 2.1 capable
• Operates in BTL or PBTL
• PurePath Console Motherboard provides flexible input signal routing (USB, SPDIF, and analog)
• Demonstration, evaluation and development environment via the PurePath Console 3 software (GUI)

图6.评估模块TAS5825MEVM 3D外形图

图7.评估模块TAS5825MEVM电路图(1)

图8.评估模块TAS5825MEVM电路图(2)

图9.评估模块TAS5825MEVM电路图(3)
评估模块TAS5825MEVM材料清单:



图10.评估模块TAS5825MEVM PCB顶层综合图

图11.评估模块TAS5825MEVM PCB底层综合图
详情请见:
http://www.ti.com/lit/ds/symlink/tas5825m.pdf
http://www.ti.com/lit/ug/slau749/slau749.pdf
tas5825m.rar
slau749.pdf

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