原标题：IR R4301 90Wx2 D类音频放大器参考设计

　　IR公司的IR4301集成了PWM控制器和数字音频MOSFET,组成了高性能的D类音频放大器, 具有高峰值音乐输出功率和不需要机械散热器,可采用单电源或双电源,差分或单端输入,过流,超温和欠压保护与自重起功能,主要用在家庭影院,PC音频系统,卡拉OK放大器,游戏控制台,扬声器,音乐设备以及通用音频功率放大器.本文介绍了IR43x1主要特性, 功能方框图,反相和差分放大器应用电路,以及IRAUDAMP21 90Wx2 D类音频放大器参考设计主要指标,电路图,材料清单和PCB元件布局图.

　　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

　　图1. IR4301功能方框图

　　IR4301典型应用:

　　Home theatre systems

　　 Docking station audio systems

　　 PC audio systems

　　 Musical instruments

　　 Karaoke amplifiers

　　 Game consoles

　　 Powered speaker systems

　　 General purpose audio power amplifiers

　　图2. IR4301反相放大器电路图

　　图3. IR4301差分放大器电路图

　　图4. IR4301单电源应用电路图

　　IRAUDAMP21参考设计

　　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.

　　图5.IRAUDAMP21参考设计外形图

　　IRAUDAMP21参考设计应用:

　　 AV receivers

　　 Home theater systems

　　 Mini component stereos

　　 Powered speakers

　　 Sub-woofers

　　 Musical Instrument amplifiers

　　 Car audio amplifiers

　　IRAUDAMP21参考设计主要技术指标:

　　IRAUDAMP21参考设计子板材料清单:

　　IRAUDAMP21参考设计主板材料清单: