IR公司的IR4302和IR4312集成了兩路PWM控制器和數字音頻MOSFET,組成高性能D類(lèi)音頻放器,其輸出功率為100Wx2路(10%THD+N 4Ω 負載,帶散熱器),60Wx2路(10%THD+N 4Ω ,不帶散熱器),具有多種保護功能如過(guò)流保護(OCP),過(guò)壓保護(OVP),欠壓保護(UVP)和超溫保護(OTP),主要用于家庭影院,PC音頻系統,卡拉OK放大器,游戲控制器,揚聲器系統和通用音頻功率放大器.本文介紹了IR4302主要特性,功能方框圖,典型應用電路以及采用IR4302的100W / 4歐姆x 2路D類(lèi)音頻功率放大器主要特性,電路圖,材料清單和PCB布局圖.
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 amplifiers

圖1.IR4302功能方框圖


圖2.IR4302反相放大器連接圖

圖3.IR4302差分放大器連接圖

圖4.IR4302單電源連接圖(反相放大器)

采用IR4302的100W / 4歐姆x 2路D類(lèi)音頻功率放大器

圖5.100W / 4歐姆x 2路D類(lèi)音頻功率放大器IRAUDAMP17外形圖

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

IRAUDAMP17主要指標:


圖6.IRAUDAMP17電路圖

IRAUDAMP17材料清單:



圖7.IRAUDAMP17 PCB布局圖:頂層

圖8.IRAUDAMP17 PCB布局圖:底層