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| R4301 90Wx2 D类音频放大器参考设计 |
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| 文章来源： 更新时间：2014/4/21 11:06:00 |
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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:
图6.IRAUDAMP21参考设计电路图:子板
图7.IRAUDAMP21参考设计电路图:主板音量控制和电源
图8.IRAUDAMP21参考设计电路图:时钟和管理
IRAUDAMP21参考设计子板材料清单:
IRAUDAMP21参考设计主板材料清单:
图9.IRAUDAMP21参考设计子板PCB布局图:顶层
图10.IRAUDAMP21参考设计子板PCB布局图:底层
图11.IRAUDAMP21参考设计主板PCB布局图:顶层
图12.IRAUDAMP21参考设计主板PCB布局图:底层 |
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