Maxim MAX98400 MP3坞站D类放大器参考设计

Maxim公司的MAX98400A/MAX98400B是高性能热效率高的D类音频放大器, MAX98400A能向8欧姆负载提供2x20W或向4欧姆负载提供1x40W, MAX98400B则向8欧姆负载提供2x8W功率.单电源8V 到28V工作,提供67dB PSRR,12V时的效率高达90%,主要用在LCD/PDP TV,LCD监视器,MP3坞站和笔记本PC.本文介绍了MAX98400A/MAX98400B主要特性, MAX98400A/B功能方框图,以及MAX98400A立体声和单声道配置图, MAX98400 D类音频放大器参考设计主要特性,电路图,材料清单和PCB布局图.

The MAX98400A/MAX98400B Class D amplifiers provide high-performance, thermally efficient amplifier solutions. The MAX98400A delivers 2x20W into 8I loads or 1x40W into a 4I load. The MAX98400B delivers 2x12W into 8I loads.

An integrated limiting circuit prevents output clipping distortion, protects small speakers from transient voltages, and reduces power dissipation.

A thermal-foldback feature can be enabled to automatically reduce the output power at above a junction temperature of +120NC. Traditional thermal protection is also available in addition to robust overcurrent protection.

The ICs operate from a single 8V to 28V supply and provide a high 67dB PSRR, eliminating the need for a regulated power supply. They offer up to 90% efficiency from a 12V supply.
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