IR公司的IR4302和IR4312集成了两路PWM控制器和数字音频MOSFET,组成高性能D类音频放器,其输出功率为100Wx2路(10%THD+N 4Ω 负载,带散热器),60Wx2路(10%THD+N 4Ω ,不带散热器),具有多种保护功能如过流保护(OCP),过压保护(OVP),欠压保护(UVP)和超温保护(OTP),主要用于家庭影院,PC音频系统,卡拉OK放大器,游戏控制器,扬声器系统和通用音频功率放大器.本文介绍了IR4302主要特性,功能方框图,典型应用电路以及采用IR4302的100W / 4欧姆x 2路D类音频功率放大器主要特性,电路图,材料清单和PCB布局图.
The IR4302, IR4312 integrates 2 channel 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 IR4302, IR4312 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 7x7 mm PQFN package enhances the benefit of smaller size of Class D topology. The IR4302, IR4312 are a lead-free, ROHS compliant.

IR4302主要特性:
 2 channel integrated analog input Class D audio amplifier in a small 7 x 7 mm PQFN44 package
 No mechanical heatsink required
 High peak music power output
 Split or single power supply
 Differential or single-ended input
 Over-current, over-temperature and under voltage protections with self-reset feature
 Start/stop click noise reduction
 Clip and Fault reporting outputs
 High noise immunity
 RoHS compliant

IR4302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1.IR4302功能方框图


图2.IR4302反相放大器连接图

图3.IR4302差分放大器连接图

图4.IR4302单电源连接图(反相放大器)

采用IR4302的100W / 4欧姆x 2路D类音频功率放大器

图5.100W / 4欧姆x 2路D类音频功率放大器IRAUDAMP17外形图

The IRAUDAMP17 reference design is a two-channel, 100W/ch (4 Ω/52V Bus voltage) half-bridge Class D audio power amplifier with single power supply. This reference design demonstrates how to use the IR4302 IC with single power supply, implement protection circuits, and design an optimum PCB layout using PowIRaudio integrated Class D IC. This reference design does not require additional 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 twochannel design is scalable for power and the number of channels.

IRAUDAMP17主要特性:
Output Power: 100W x 2 channels (10%THD+N 4Ω load; with heatsink),
60W x 2 channels (10%THD+N 4Ω load; no heatsink),
Multiple Protection Features: Over-current protection (OCP), high side and low side
Over-voltage protection (OVP),
Under-voltage protection (UVP), high side and low side
Over-temperature protection (OTP)
PWM Modulator: Self-oscillating half-bridge topology

IRAUDAMP17应用:
 AV receivers
 Home theater systems
 Mini component stereos
 Powered speakers
 Sub-woofers
 Musical Instrument amplifiers
 Car audio amplifiers

IRAUDAMP17主要指标:


图6.IRAUDAMP17电路图

IRAUDAMP17材料清单:



图7.IRAUDAMP17 PCB布局图:顶层

图8.IRAUDAMP17 PCB布局图:底层