原标题：Maxim MAX9830 2W单声道D类放大方案

　　Maxim公司的MAX9830是2W单声道D类放大器,提供AB类放大器的音频性能和D类放大器的效率. 5V时的静态电流1.6mA, 3.6V时的静态电流1.2mA,关断模式电流为0.5uA,专利的无滤波器的广谱调制方案不需要通常D类放大器的输出滤波器,从而降低了外接元件.主要用在笔记本和上网本电脑,手机,MP3播放器,手提音频播放器和VoIP电话.本文介绍了MAX9830主要特性,方框图以及MAX9830A评估板主要特性,电路图和元件列表.

　　The MAX9830 mono 2W Class D amplifier provides Class AB audio performance with Class D efficiency. Active emissions limiting edge rate and overshoot control circuitry greatly reduces EMI. A patented filterless spread-spectrum modulation scheme eliminates the need for output filtering found in traditional Class D devices. These features reduce application component count.

　　The MAX9830’s industry-leading 1.6mA at 5V, 1.2mA at 3.6V, quiescent current extends battery life in portable applications.

　　The MAX9830 is available in an 8-pin TDFN (2mm x 2mm x 0.8mm) and is specified over the extended -40℃ to +85℃ temperature range.

　　MAX9830主要特性:

　　_ Industry-Leading Quiescent Current: 1.6mA at 5V, 1.2mA at 3.6V

　　_ Spread Spectrum and Active Emissions Limiting

　　_ Passes EMI Limit Unfiltered with Up to 24in (61cm) of Speaker Cable

　　_ Click-and-Pop Suppression

　　_ Thermal and Overcurrent Protection

　　_ Low 0.5μA Current Shutdown Mode

　　_ Space-Saving, 2mm x 2mm x 0.8mm, 8-Pin TDFN Package

　　MAX9830应用:

　　Notebook and Netbook Computers

　　Cellular Phones

　　MP3 Players

　　Portable Audio Players

　　VoIP Phones

　　图1.MAX9830功能方框图

　　MAX9830A评估板

　　The MAX9830A evaluation kit (EV kit) is a fully assembled and tested circuit board that uses the MAX9830A filterless Class D amplifier to drive a mono bridge-tied-load (BTL) speaker in portable audio applications. Designed to operate from a 2.6V to 5.5V DC power supply, the EV kit is capable of delivering 2W into a 4I load. The EV kit accepts differential or single-ended input signals.

　　The MAX9830A EV kit also evaluates the MAX9830B–MAX9830E.

　　MAX9830A评估板主要特性:

　　Industry-Leading Quiescent Current 1.6mA (VDD = 5V), 1.2mA (VDD = 3.6V)

　　Filterless Operation Passes EN55022B-Radiated

　　Emissions with Up to 24in (61cm) of Speaker Cable

　　Evaluates the MAX9830B–MAX9830E (with IC Replacement)

　　2.6V to 5.5V Single-Supply Operation

　　2W Mono Class D Output

　　Differential or Single-Ended Input

　　Low-Power Shutdown Input

　　Fully Assembled and Tested

　　图2.MAX9830A评估板电路图

　　MAX9830A评估板元件列表: