TI公司的TAS2560是低功耗高性能数字输入D类音频放大器,4.2V电源1% THD+N时能向4欧姆负载提供5.6W,输入取样频率8 kHz 到96 kHz,内置自动增益控制(AGC),主要用在手机,平板电脑,个人电子学,建筑物/家庭自动化,蓝牙扬声器和附件.本文介绍了TAS2560主要特性,框图,立体声配置图和典型应用电路,以及5.6W D类音频放大器模块TAS2560 EVM主要特性,电路图,材料清单和PCB设计图.
The TAS2560 is a low-power, high-performance,digital input, boosted Class-D Audio amplifier that canbe easily implemented in both mono and stereo (x2)applications. The device features an ultra low-noiseaudio DAC and Class-D power amplifier whichincorporates speaker voltage and current sensingfeedback for use with speaker protection algorithms.
A Class-H boost converter generates the Class-Damplifier supply rail. When the audio signal requiresonly a lower Class-D output power, system　efficiencyis improved by deactivating the boost and connectingVBAT directly to the Class-D amplifier supply. Whenhigher audio output power is required, the multi-levelboost re-activates tracking the signal to provide theadditional voltage to the load.
A configurable on-chip Battery Guard system reducesthe audio output power during the periods of lowbattery voltage to minimize the battery droppingbelow system brownout conditions. Additionally, faultssuch as brownout, over-current, and overtemperaturecan be reported back to the hostprocessor using the IRQ pin. All protection statusesare available via a register read.

TAS2560主要特性:
1• Ultra Low-Noise Mono Boosted Class-D Amplifier
– 5.6 W at 1% THD+N and 6.9 W at 10%THD+N into 4-Ω Load from 4.2-V Supply
– 3.7 W at 1% THD+N and 4.5 W at 10%THD+N into 8-Ω Load from 4.2-V Supply
• Output Noise for DAC + Class-D(ICN) is 16.2 μV
• DAC + Class-D SNR 111 dB at 1%THD+N/8 Ω
• THD+N –89 dB at 1 W/8 Ω with Flat FrequencyResponse
• Post-Filter Feedback (PFFB)
• PSRR 110 dB for 200 mVpp Ripple at 217 Hz
• Input Sample Rates from 8 kHz to 96 kHz
• High Efficiency Class-H Boost Converter
– Automatically Adjusts Class-D Supply
– Multi-level Tracking to Improve Efficiency
• Built-In Speaker Sense
– Measures Speaker Current and Voltage
– Measures VBAT Voltage, Chip Temperature
• Built-In Automatic Gain Control (AGC)
– Limits Battery Current Consumption
• Adjustable Class-D Switching Edge-Rate Control
• Power Supplies
– Boost Input: 2.9 V to 5.5 V
– Analog/Digital: 1.65 V to 1.95 V
– Digital I/O: 1.62 V to 3.6 V
• Thermal, Short-Circuit, and Under-VoltageProtection
• I2S, Left-Justified, Right-Justified, DSP, and TDM,and PDM
• I2C Interface for Register Control
• Stereo Configuration Using Two TAS2560Devices

TAS2560应用:
• Mobile Phones
• Tablets
• Personal Electronics
• Building / Home Automation
• Bluetooth Speakers and Accessories

图1.TAS2560功能框图

图2.两个TAS2560 TDM模式的立体声配置图

图3.TAS2560典型应用-数字音频输入

TAS2560 5.6W D类音频放大器模块TAS2560 EVM
The TAS2560 evaluation module enables users to quickly and easily evaluate the TAS2560 audio amplifier.  This small reference design comes with an USB cable to easily connect the board to your PC and control with a register based graphical user interface provided within Pure Path Console 3 (PPC3).  The USB cable also allows for audio routing directly to the EVM.  Users can evaluate the audio quality and analog performance that the TAS2560 provides.  A +5V power supply and speaker, not included, is required for power and audio evaluation.

TAS2560 5.6W D类音频放大器模块TAS2560 EVM主要特性:
TAS2560 5.7W Class-D Audio Amplifier w/ IV Sense
USB cable for control and digital audio input
PurePath console 3 software access
Stereo capable when connecting two TAS2560 evaluation modules
The TAS2560 EVM supports evaluation and development with the TAS2560 through the followinginterfaces:
1. USB interface
(a) TAS2560 control through PurePath™ Console 3 GUI, USB-HID
(b) USB-class Audio Device, compatible with Microsoft® Windows® 7
2. Digital audio AP/PSIA interface through 100-mil headers
3. TI Learning Board 2 for speaker characterization
4. SPI interface for TAS2560 control
5. I2C interface for TAS2560 control

图4.5.6W D类音频放大器评估模块TAS2560 EVM外形图

图5.5.6W D类音频放大器评估模块TAS2560 EVM电路图(1)

图6.5.6W D类音频放大器评估模块TAS2560 EVM电路图(2)

图7.5.6W D类音频放大器评估模块TAS2560 EVM电路图(3)

图8.5.6W D类音频放大器评估模块TAS2560 EVM电路图(4)

图9.5.6W D类音频放大器评估模块TAS2560 EVM电路图(5)
5.6W D类音频放大器评估模块TAS2560 EVM材料清单:

图10.5.6W D类音频放大器评估模块TAS2560 EVM PCB设计图(1)

图11.5.6W D类音频放大器评估模块TAS2560 EVM PCB设计图(2)

图12.5.6W D类音频放大器评估模块TAS2560 EVM PCB设计图(3)

图13.5.6W D类音频放大器评估模块TAS2560 EVM PCB设计图(4)

图14.5.6W D类音频放大器评估模块TAS2560 EVM PCB设计图(5)

图15.5.6W D类音频放大器评估模块TAS2560 EVM PCB设计图(6)

图16.5.6W D类音频放大器评估模块TAS2560 EVM PCB设计图(7)

图17.5.6W D类音频放大器评估模块TAS2560 EVM PCB设计图(8)

图18.5.6W D类音频放大器评估模块TAS2560 EVM PCB设计图(9)