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[原创]Infineon MA12070P2x30W无滤波器高效音频放大器解决方案

Infineon公司的MA12070P是带I2S数字输入的无滤波器高效+4V到+26V音频放大器.这种超效率音像功率放大器是基于有所有全的多级开关技术,可以用在许多不同的应用领域.多级开关在工作时有非常低的功耗,可使放大器在各种音频产品中满功率时无滤波器配置.MA12070P具有嵌入数字功率管理方案,功率管理算法动态调整开关频率和调制,以优化功耗和EMI.集成的数模转换器(DAC)赋能数字I2S音频流输入.支持的取样频率从44.1 kHz 到192 kHz.器件还提供高度灵活的输出级配置,从表面上看单端输出到单个并行BTL输出.MA12070P的高效率(PMP4)包括小于160mW的空闲功耗,2W的效率大于80%,满功率时的效率大于92%.MA12070P的音频性能(PMP2)包括>101dB DNR (A律, 1% THD+N 功率电平),输出综合噪音(A律)为140μV,高输出时的THD+N为0.007%.器件采用4阶反馈误差控制.连续输出功率为2x30W,峰值输出功率为2x80W.器件的保护功能包括欠压锁住,超温告警/误差,短路/过载保护,功率级引脚本-引脚短路,通过I2C进行到底误差报告,DC保护和I2C控制(四个可选择地址).主要用在电池供电扬声器,无线和坞站扬声器,条形音箱,多房间系统和家庭影院.本文介绍了MA12070P主要特性,应用框图和容量和限制器处理器(VLP)功能框图以及40W开发板KIT_ARDMKR_AMP_40W主要特性与指标,电路图,材料清单和PCB设计图.

The MA12070P is a super-efficient audio poweramplifier based on proprietary multi-level switchingtechnology. It supports a 4-26V supply voltage range,allowing it to be used in many different applications.

Multi-level switching enables very low power lossduring operation. In addition, it allows the amplifier tobe used in filterless configurations at full rated powerin a wide range of audio products.

The MA12070P features an embedded digital powermanagement scheme. The power managementalgorithm dynamically adjusts switching frequency andmodulation to optimize power loss and EMI across theoutput power range.

An integrated digital-to-analog converter enablesdigital I2S audio stream input. It supports sample ratesfrom 44.1 kHz to 192 kHz.

Highly flexible output stage configurations are offered,ranging from four single-ended outputs to a singleparallel-BTL output.

The MA12070P features protection against DC, shortcircuits,over-temperature and under-voltagesituations.

Flexible “Power Mode Profiles” allow the user to utilizethe multi-level switching technique for very low powerloss or very high audio performance.

Device communication and programming is controlledthrough an I2C interface as well as dedicated controlpins.

MA12070P主要特性:

• Proprietary Multi-level Switching Technology

◦ 3-level and 5-level modulation

◦ Low EMI emission

◦ Filterless amplification

◦ Digital Power Management Algorithm

• High Power Efficiency (PMP4)

◦ <160mW Idle power dissipation (26V PVDD,all channels switching)

◦ >80% Efficiency at 2W power (1kHz sine, 8Ω)

◦ >92% Efficiency at Full Power (1kHz sine, 8Ω)

• Audio Performance (PMP2)

◦ >101dB DNR (A-w, rel. to 1% THD+N powerlevel)

◦ 140μV output integrated noise (A-w)

◦ 0.007% THD+N at high output levels

• 4th Order Feedback Error Control

◦ High suppression of supply disturbance

◦ HD audio quality

• Supply Voltages: +4V to +26V (PVDD) and +5V(A/DVDD)

• Volume Control and Limiter

• 2x30W continuous output power (RL = 8Ω at 22V,PMP4, 10% THD+N level, without heatsink)

• 2×80W peak output power (26V PVDD, RL = 4Ω,10% THD+N level)

• 2.0, 2.1, 4.0, 1.0 Output Stage Configurations

• Protection

◦ Under-voltage-lockout

◦ Over-temperature warning/error

◦ Short-circuit/overload protection

◦ Power stage pin-to-pin short-circuit

◦ Error-reporting through serial interface (I2C)

◦ DC protection

• I2C control (four selectable addresses)

• Heatsink free operation with EPAD-down package

MA12070P封装:

• 64-pin QFN Package with exposed thermal pad(EPAD) and Lead-free Soldering

MA12070P应用:

• Battery Operated Speakers

• Wireless and Docking Speakers

• Soundbars

• Multiroom Systems

• Home Theater Systems

图1.MA12070P应用框图

图2.MA12070P容量和限制器处理器(VLP)功能框图

40W开发板KIT_ARDMKR_AMP_40W

Design of an Arduino compatible audio amplifier platform

This document describes the design principles of an audio amplifier platform that is compatible with Arduino boards supporting I2S audio playback. More specifically, this application note will discuss the design of the KIT_ARDMKR_AMP_40W board on both hardware (PCB design) and firmware (Arduino code). The board contains Infineons MA12070P multilevel amplifier, which will be discussed in more detail. The content should enable both professional engineers as well as DIYs to build prototypes, reproduce the design, or pick up the design for further development as part of the product design process. The design is generic in principle and can be used in combination with any audio board that supports I2S audio playback.

The Arduino project started in 2005 as a student program at the Interaction Design Institute Ivrea, in Ivrea, Italy, aiming to provide an affordable and easy way to create devices that interact with their environment while using advanced microprocessors, controllers, sensors and transducers.

Since 2005, Arduino boards have been steadily growing in popularity among makers and DIY enthusiasts, who have developed a broad range of projects, from gaming consoles and drone controls to various smart home automation projects.

Arduino boards are based on open-source hardware and software, licensed under the GNU Lesser General Public License (LGPL) or the GNU General Public License (GPL), enabling board manufacturing and software distribution by anyone. This extends the development of high-performance embedded computing power to a much wider audience – including people without alo professional hardware or software background.

When looking at the types of DIY projects, it is interesting to see that many revolve around audio connectivity, e.g., IoT audio interaction or stand-alone audio players. Until recently it was necessary to add several separate boards or “shields” together to realize such a system.

This has changed since the release of the MKR family, where Arduino has now added audio features such as an I2S bus, SD card audio read/write and Alexa voice-control compatibility. This also makes the Arduino platform a perfect demonstration vehicle for Infineons high-performance integrated class D audio ICs.

By releasing a fully compatible amplifier board with enough output power to drive a variety of speakers – all with best-in-class audio performance, low power consumption and high efficiency – Infineon is providing yet another useful building block in the Arduino ecosystem.

The Infineon Arduino board has the following key parameters and features:

· Equipped with MERUSTM MA12070P proprietary multilevel amplifier

· Power input: 5 V/2.5 A – sourced from the same single USB-C power supply or battery pack

· No need for external or extra power supplies

· Up to 40 W instantaneous peak output power with a USB-C power supply or battery pack

· Compatible with Arduino MKRZERO and MKR1000 Wi-Fi

· Full hardware control, customization and error monitoring through the Arduino programming framework

The KIT_ARDMKR_AMP_40W board is an audio amplifier board compatible with the MKRZERO board from Arduino and built around Infineons MERUS™ MA12070P multilevel amplifier. In Figure 2 the following main system components are identified:

1. USB-C power input

2. Boost converter

3. Bulk capacitance

4. Audio amplifier

5. User interface

6. Arduino microcontroller