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| MAX98390集成動態揚聲器管理D類放大器解決方案 |
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| 文章來源：永阜康科技 更新時間：2019/7/10 9:44:00 |
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Maxim公司的MAX98390是高效單路D類動態揚聲器管理(DSM)智能放大器,集成了升壓轉換器,動態揚聲器管理和在低功率輸出時的FET縮放比例以得到更高效率.其升壓轉換器輸出電壓可編從6.5V到10V,增量0.125V,電池電壓可低至2.65V,支持旁路模式以得到更低靜態電流,改善中功率效率以及包絡跟蹤,能自動調整輸出功率以獲得最大效率,提升的效率在10% THD+N能向4Ω負載提供高達6.2W.器件具有9μV超低輸出噪音,117dB動態范圍,THD+N低失真為0.01%, VVBAT = 3.7V時8Ω負載1.2W時的效率為82%,負載0.45W時的效率為86%,工作溫度-40℃ 到 +85℃,主要用在智能手機,平板電腦,筆記本電腦,單節鋰電池設備,物聯網(IoT)設備和玩具.本文介紹了MAX98390主要優勢和特性,簡化框圖,升壓轉換器框圖,典型應用電路圖以及評估系統MAX98390 EVS主要特性,框圖和電路圖,材料清單以及PCB設計圖.
The MAX98390 is a high-efficiency mono Class-D DSM smart amplifier 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主要優勢和特性:
● 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應用:
● Smartphones
● Tablets
● Notebook Computers
● Single Li-ion Cell Devices
● IoT Devices
● Toys
圖1.MAX98390簡化框圖
圖2.MAX98390升壓轉換器框圖
圖3.MAX98390典型應用電路圖
評估系統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.
評估系統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
圖4.評估系統MAX98390 EVS框圖
圖5.評估系統MAX98390 EVS電路圖
評估系統MAX98390 EVS材料清單:
圖6.評估系統MAX98390 EVS PCB設計圖:頂層元件放置圖(絲印圖)
圖7.評估系統MAX98390 EVS PCB設計圖:頂層布局圖
圖8.評估系統MAX98390 EVS PCB設計圖:層1布局圖
圖9.評估系統MAX98390 EVS PCB設計圖:層2布局圖
圖10.評估系統MAX98390 EVS PCB設計圖:層3布局圖
圖11.評估系統MAX98390 EVS PCB設計圖:層4布局圖
圖12.評估系統MAX98390 EVS PCB設計圖:底層布局圖
圖13.評估系統MAX98390 EVS PCB設計圖:底層元件放置圖(絲印圖)
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