IR公司的IR4301和R4311集成了PWM控制器和數字音頻MOSFET,組成了高性能D類(lèi)音頻放大器,具有高峰值音樂(lè )功率輸出,不需要機械的散熱器,單電源或雙電源工作,差分或單端輸入,過(guò)流,超溫和欠壓保護,并具復位功能,IR4301能向4歐姆輸出160W功率,IR4311能向4歐姆輸出35W功率,主要用在家庭影院系統,塢站音頻系統,電子音樂(lè ),卡拉OK放大器,游戲控制臺,揚聲器系統和通用音頻功率放大器.本文介紹了IR4301和IR4311主要特性,方框圖,多種連接電路和應用電路,以及采用IR4301的130W/4Ω x 2路D類(lèi)音頻功率放大器IRAUDAMP12參考設計主要特性,電路圖,材料清單和PCB布局圖.
The IR4301, IR4311 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 IR4301, IR4311 operates 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 MLPQ package enhances the benefit of smaller size of Class D topology. The IR4301, IR4311 are a lead-free, ROHS compliant.

IR4301和IR4311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

IR4301和IR4311產(chǎn)品特性:


IR4301和R4311典型應用:
 Home theatre systems
 Docking station audio systems
 PC audio systems
 Musical instruments
 Karaoke amplifiers
 Game consoles
 Powered speaker systems
 General purpose audio power amplifier

圖1.IR4301和IR4311方框圖

圖2.IR4301和IR4311反相放大器連接圖

圖3.IR4301和IR4311差分放大器連接圖

圖4.IR4301和IR4311單電源連接圖

采用IR4301的130W/4Ω x 2路D類(lèi)音頻功率放大器IRAUDAMP12參考設計
The IRAUDAMP12 reference design is a two-channel, 130W/ch (4Ω/±31V; no heatsink)/ 160W/ch (4Ω/±34V; *with heatsink) half-bridge Class D audio power amplifier. This reference design demonstrates how to use the IR4301 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5.130W 2路D類(lèi)音頻功率放大器IRAUDAMP12外形圖

D類(lèi)音頻功率放大器IRAUDAMP12主要特性:

D類(lèi)音頻功率放大器IRAUDAMP12應用:
 AV receivers
 Home theater systems
 Mini component stereos
 Powered speakers
 Sub-woofers
 Musical Instrument amplifiers
 Car audio amplifiers

圖6. D類(lèi)音頻功率放大器子板電路圖

圖7. D類(lèi)音頻功率放大器主板電路圖

圖8. D類(lèi)音頻功率放大器主板時(shí)鐘和管理電路圖
IRAUDAMP12 子板材料清單:

IRAUDAMP12 主板材料清單:




圖9.IRAUDAMP12子板PCB布局圖:頂層

圖10.IRAUDAMP12子板PCB布局圖:底層

圖11.IRAUDAMP12主板PCB布局圖:頂層

圖12.IRAUDAMP12主板PCB布局圖:底層