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關(guān)鍵詞： D類放大器 , MAX98400 , Maxim , MP3 , 塢站
Maxim公司的MAX98400A/MAX98400B是高性能熱效率高的D類音頻放大器, MAX98400A能向8歐姆負(fù)載提供2x20W或向4歐姆負(fù)載提供1x40W, MAX98400B則向8歐姆負(fù)載提供2x8W功率.單電源8V 到28V工作,提供67dB PSRR,12V時(shí)的效率高達(dá)90%,主要用在LCD/PDP TV,LCD監(jiān)視器,MP3塢站和筆記本PC.本文介紹了MAX98400A/MAX98400B主要特性, MAX98400A/B功能方框圖,以及MAX98400A立體聲和單聲道配置圖, MAX98400 D類音頻放大器參考設(shè)計(jì)主要特性,電路圖,材料清單和PCB布局圖.
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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.
Filterless modulation allows the ICs to pass EN55022B EMI limits with 1m cables using only a low-cost ferrite bead and small-value capacitor on each output. Both devices feature eight digitally controlled gain settings.
Comprehensive click-and-pop reduction circuitry minimizes noise coming into and out of shutdown.
The MAX98400A/MAX98400B are available in 36-pin and 24-pin TQFN packages, respectively, and are specified over the -40NC to +85NC temperature range.
MAX98400A/MAX98400B主要特性:
Wide 8V to 28V Supply Voltage Range
Single-Supply Operation
Low EMI: Active Emissions Limiting
Clipping Limiter
Low Quiescent Current
Thermal Foldback
Thermal and Overcurrent Protection
MAX98400A/MAX98400B應(yīng)用:
LCD/PDP Televisions
LCD Monitors
MP3 Docking Stations
Notebook PCs
圖1.MAX98400A功能方框圖
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下載附件 (15.2 KB)圖2.MAX98400B功能方框圖
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下載附件 (27.06 KB)圖3.MAX98400A立體聲配置圖
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下載附件 (20.62 KB)圖4.MAX98400A單聲道配置圖
MAX98400 D類音頻放大器參考設(shè)計(jì)
This reference design demonstrates the use of the MAX98400 Class D audio amplifier in a stereo audio docking station application. The MAX98400 2.1 demo box is a complete powered speaker dock that uses two MAX98400 ICs to drive a 3-channel speaker system consisting of two 2in satellite speakers and one 5in subwoofer. The reference design is intended to be used with a portable audio player as its main music source. The overall solution size is very compact and features active equalization, powersupply monitoring, and dynamic equalization for the subwoofer.
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下載附件 (79.96 KB)圖5. MAX98400 D類音頻放大器參考設(shè)計(jì)外形圖
MAX98400 D類音頻放大器主要設(shè)計(jì)特性:
Compact all-in-one design
Operates from a single 12V to 20V DC power supply
High SPL output from a small box
High-efficiency Class-D design
Active EQ, including dynamic bass equalization
Excellent sound quality from cost-effective drivers
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下載附件 (40.85 KB)圖6. MAX98400 D類音頻放大器參考設(shè)計(jì)電路圖(1)
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下載附件 (36.32 KB)圖7. MAX98400 D類音頻放大器參考設(shè)計(jì)電路圖(2)
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下載附件 (38.84 KB)圖8. MAX98400 D類音頻放大器參考設(shè)計(jì)電路圖(3)
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下載附件 (42.09 KB)圖9. MAX98400 D類音頻放大器參考設(shè)計(jì)電路圖(4)
參考設(shè)計(jì)材料清單:
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下載附件 (46.26 KB)圖10. MAX98400 D類音頻放大器參考設(shè)計(jì)PCB布局圖
詳情請(qǐng)見(jiàn):
MAX98400A-MAX98400B[1].pdf (2.46 MB, 下載次數(shù): 0)
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下載次數(shù): 0下載積分: 積分 -1 和
AN4320[1].pdf (495.15 KB, 下載次數(shù): 0)
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下載次數(shù): 0下載積分: 積分 -1
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