IR公司的IR4301和R4311集成了PWM控制器和数字音频MOSFET,组成了高性能D类音频放大器,具有高峰值音乐功率输出,不需要机械的散热器,单电源或双电源工作,差分或单端输入,过流,超温和欠压保护,并具复位功能,IR4301能向4欧姆输出160W功率,IR4311能向4欧姆输出35W功率,主要用在家庭影院系统,坞站音频系统,电子音乐,卡拉OK放大器,游戏控制台,扬声器系统和通用音频功率放大器.本文介绍了IR4301和IR4311主要特性,方框图,多种连接电路和应用电路,以及采用IR4301的130W/4Ω x 2路D类音频功率放大器IRAUDAMP12参考设计主要特性,电路图,材料清单和PCB布局图.
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产品特性:


IR4301和R4311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 amplifier

图1.IR4301和IR4311方框图

图2.IR4301和IR4311反相放大器连接图

图3.IR4301和IR4311差分放大器连接图

图4.IR4301和IR4311单电源连接图

采用IR4301的130W/4Ω x 2路D类音频功率放大器IRAUDAMP12参考设计
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.

图5.130W 2路D类音频功率放大器IRAUDAMP12外形图

D类音频功率放大器IRAUDAMP12主要特性:

D类音频功率放大器IRAUDAMP12应用:
 AV receivers
 Home theater systems
 Mini component stereos
 Powered speakers
 Sub-woofers
 Musical Instrument amplifiers
 Car audio amplifiers

图6. D类音频功率放大器子板电路图

图7. D类音频功率放大器主板电路图

图8. D类音频功率放大器主板时钟和管理电路图
IRAUDAMP12 子板材料清单:

IRAUDAMP12 主板材料清单:




图9.IRAUDAMP12子板PCB布局图:顶层

图10.IRAUDAMP12子板PCB布局图:底层

图11.IRAUDAMP12主板PCB布局图:顶层

图12.IRAUDAMP12主板PCB布局图:底层