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R4301 90Wx2 D類音頻放大器參考設(shè)計

文章來源：更新時間：2014/4/21 11:06:00

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IR公司的IR4301集成了PWM控制器和數(shù)字音頻MOSFET,組成了高性能的D類音頻放大器,具有高峰值音樂輸出功率和不需要機械散熱器,可采用單電源或雙電源,差分或單端輸入,過流,超溫和欠壓保護(hù)與自重起功能,主要用在家庭影院,PC音頻系統(tǒng),卡拉OK放大器,游戲控制臺,揚聲器,音樂設(shè)備以及通用音頻功率放大器.本文介紹了IR43x1主要特性, 功能方框圖,反相和差分放大器應(yīng)用電路,以及IRAUDAMP21 90Wx2 D類音頻放大器參考設(shè)計主要指標(biāo),電路圖,材料清單和PCB元件布局圖.
The IR43x1 integrates PWM controller and digital audio MOSFETs forming a high performance Class D audio amplifier. As a result of fully optimized MOSFETs co-packed with a dedicated controller IC, the IR43X1operates without mechanical heatsink attached in a typical music playback usage. High voltage ratings and noise immunity in the controller IC ensures reliable operation over various environmental conditions. A small 5x6 mm PQFN package enhances the benefit of smaller size of Class D topology. The IR43x1 are a lead-free, ROHS compliant.

IR43x1主要特性:
 Integrated analog input Class D audio amplifier in a small 5 x 6 mm PQFN package
 High peak music power output
 No mechanical heatsink required
 Split or single power supply
 Differential or single-ended input
 Over-current, over-temperature and under voltage protections with self-reset function
 Start and stop click noise reduction
 High noise immunity
 RoHS compliant

圖1. IR4301功能方框圖

IR4301典型應(yīng)用:
Home theatre systems
 Docking station audio systems
 PC audio systems
 Musical instruments
 Karaoke amplifiers
 Game consoles
 Powered speaker systems
 General purpose audio power amplifiers

圖2. IR4301反相放大器電路圖

圖3. IR4301差分放大器電路圖

圖4. IR4301單電源應(yīng)用電路圖

IRAUDAMP21參考設(shè)計
The IRAUDAMP21 reference design is a two-channel, 90W/ch (2Ω/±18V; no heatsink)/ 135W/ch (2Ω/±22V; *with heatsink) half-bridge Class D audio power amplifier. This reference design demonstrates how to use the IR4321 IC, implement protection circuits, and design an optimum PCB layout using PowIRaudio integrated Class D IC. This reference design does not require heatsink or fan cooling for normal operation (one-eighth of continuous rated power).The reference design provides all the required housekeeping power supplies for ease of use. The two-channel design is scalable for power and the number of channels.

圖5.IRAUDAMP21參考設(shè)計外形圖

IRAUDAMP21參考設(shè)計應(yīng)用:
 AV receivers
 Home theater systems
 Mini component stereos
 Powered speakers
 Sub-woofers
 Musical Instrument amplifiers
 Car audio amplifiers

IRAUDAMP21參考設(shè)計主要技術(shù)指標(biāo):