Maxim MAX98390集成动态扬声器管理D类放大器解决方案

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 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 device...