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MAX98390集成动态扬声器管理D类放大器解决方案
文章来源:永阜康科技 更新时间:2019/7/10 9:44:00
Maxim公司的MAX98390是高效单路D类动态扬声器管理(DSM)智能放大器,集成了升压转换器,动态扬声器管理和在低功率输出时的FET缩放比例以得到更高效率.其升压转换器输出电压可编从6.5V到10V,增量0.125V,电池电压可低至2.65V,支持旁路模式以得到更低静态电流,改善中功率效率以及包络跟踪,能自动调整输出功率以获得最大效率,提升的效率在10% THD+N能向4Ω负载提供高达6.2W.器件具有9μV超低输出噪音,117dB动态范围,THD+N低失真为0.01%, VVBAT = 3.7V时8Ω负载1.2W时的效率为82%,负载0.45W时的效率为86%,工作温度-40℃ 到 +85℃,主要用在智能手机,平板电脑,笔记本电脑,单节锂电池设备,物联网(IoT)设备和玩具.本文介绍了MAX98390主要优势和特性,简化框图,升压转换器框图,典型应用电路图以及评估系统MAX98390 EVS主要特性,框图和电路图,材料清单以及PCB设计图.

The MAX98390 is a high-efficiency mono Class-D DSM smart amp
lifier that features an integrated boost convert­er, integrated Dynamic Speaker ManagementTM, and FET scaling for higher-efficiency at low output power.

The maximum boost converter output voltage is program­mable from 6.5V to 10V in 0.125V increments from a bat­tery voltage as low as 2.65V. The boost converter sup­ports bypass mode for lower quiescent current and im­proved mid-power efficiency as well as envelope tracking which automatically adjusts the output voltage for maxi­mum efficiency. The boosted supply efficiently delivers up to 6.2W at 10% THD+N into a 4Ω load.

Integrated IV sense and Dynamic Speaker Management allows louder, fuller audio while protecting the speaker against damage and improving sound quality.

The PCM interface supports I2S, left-justified, and 16-channel TDM formats as a slave or master device with I2C control. Either BCLK or MCLK can be used as the in­ternal clock source providing system level flexibility.

Thermal and other status data can also be read from the I2C interface. Patented active emissions limiting edge rate and over­shoot control circuitry minimizes EMI and eliminates the need for output filtering found in traditional Class-D devices.

A flexible brownout-detection engine (BDE) can be pro­grammed to initiate various current limiting, signal limiting, and clip functions to prevent dips in battery voltage. Threshold, hysteresis, and attack-and-release rates are programmable.

The IC is available in a 0.4mm pitch, 36-bump wafer-level package. It is specified over the extended -40℃ to +85℃ temperature range.

MAX98390主要优势和特性:

● Integrated Speaker Current and Voltage Sense Requires no External Components
● Integrated Programmable 10V Boost Converter
• Bypass Mode
• Envelope Tracking
● Integrated Dynamic Speaker Management
• Thermal Protection
• Excursion Protection
• Low-Frequency Extension
• 8-Band Parametric Equalizer
• Dynamic Range Compression
• Perceptual Power Reduction
• Debuzzer
• Stereo Bass Management
● Ultra-Low Noise Floor
• 9μV Output Noise
• 117dB Dynamic Range
● Low Distortion—0.01% THD+N
● Output Power at 1% THD+N
• 5.1W into 8Ω, VVBAT = 4.3V
• 5.1W into 4Ω, VVBAT = 4.3V
● Output Power at 10% THD+N
• 6.2W into 8Ω, VVBAT = 4.3V
• 6.2W into 4Ω, VVBAT = 4.3V
● System Efficiency
• 82% at 1.2W into 8Ω, VVBAT = 3.7V
• 86% at 0.45W into 8Ω, VVBAT = 3.7V
● Dynamic Speaker Output FET Scaling
● 2.65V to 5.5V Battery Voltage Range
● I2S/16-Channel TDM and I2C Interfaces
● Class-D Edge Rate Control Enables Filterless Operation
● Advanced Brownout-Protection Engine
● Extensive Click-and-Pop Suppression
● Robust Short-Circuit and Thermal Protection
● Space-Saving, 36-Bump WLP Package (6.3mm2, 0.4mm Pitch)

MAX98390应用:

● Smartphones
● Tablets
● Notebook Computers
● Single Li-ion Cell Devices
● IoT Devices
● Toys

图1.MAX98390简化框图

图2.MAX98390升压转换器框图

图3.MAX98390典型应用电路图

评估系统MAX98390 EVS

The MAX98390 evaluation system (EV system) evaluates the MAX98390 boosted Class D audio amplifier with integrated Dynamic Speaker Management™ (DSM) IC. DSM senses the voltage and current at the load and uses patented Maxim algorithms to unlock the full potential of the speaker. The EV system comprises the MAX98390 Development Board (DEV board), Maxim’s Audio Interface Board III (AUDINT3), 5V power supply, reference microspeaker, USB cable, DSM Sound Studio software, and MAX98390 evaluation software.

It is
recommended that the DEV board be evaluated with the AUDINT3 board as an EV system. MAX98390 sup­ports standard I2S, left-justified, and TDM digital audio interfaces, as well as I2C for control.

The AUDINT3 board provides 1.8V DVDD, USB-to-PCM, and USB-to-I2C interfaces that are needed to evaluate the DEV board, requiring only a single external power supply for VBAT. The Simplified EV System Block Diagram details the DEV board and the AUDINT3 board.

The easy-to-use DSM Sound Studio software is a simple, yet powerful GUI that breaks down the DSM design process into three basic steps: extract, tune, and evalu­ate. Additionally, DSM Sound Studio provides for a 7-minute quick demo to hear the DSM difference using the included reference microspeaker.

There is also the MAX98390 evaluation software that provides complete access to all hardware registers.

评估系统MAX98390 EVS主要特性:

Complete Hardware System with Easy Setup, No Tools or Special Equipment Required
Precharacterized Reference Microspeaker Included
Easy-to-Use Graphical User Interfaces (GUIs) Software (Windows 7/10 Compatible)
DSM Sound Studio Quick Demo Using Included Speaker
Extract: Speaker Parameter Extraction
Tune: Full Acoustic Tuning Suite
Evaluate: Compare Different Tunings
MAX98390 Evaluation Software Complete Access to All Hardware Registers
EV System Contents
MAX98390 development board
Audio Interface Board III
5V power supply, 100V–240V
Micro-USB cable
Reference micro speaker
Temporary adhesive for mounting microspeaker to DEV board

图4.评估系统MAX98390 EVS框图

图5.评估系统MAX98390 EVS电路图
评估系统MAX98390 EVS材料清单:



图6.评估系统MAX98390 EVS PCB设计图:顶层元件放置图(丝印图)

图7.评估系统MAX98390 EVS PCB设计图:顶层布局图

图8.评估系统MAX98390 EVS PCB设计图:层1布局图

图9.评估系统MAX98390 EVS PCB设计图:层2布局图

图10.评估系统MAX98390 EVS PCB设计图:层3布局图

图11.评估系统MAX98390 EVS PCB设计图:层4布局图

图12.评估系统MAX98390 EVS PCB设计图:底层布局图

图13.评估系统MAX98390 EVS PCB设计图:底层元件放置图(丝印图)


 
 
 
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