IR公司的IRAUDAMP9是采用IRS2092S和IRFB4227的单路1.7 kW / 2-Ω 数字D类音频功率放大参考设计,输出功率1.7kW(2 Ω 负载, 1kHz, THD+N=10%),THD+N失真0.07%(@ 600W, 2Ω),效率97%(@ 1.7 kW, 2Ω),具有多种输出保护特性如OCP,OVP,UVP,DCP和OTP,主要用于专业音响放大器,扬声器,有源亚低音,功率放大器,汽车音频放大器和乐器放大器.本文介绍了AUIRS2092主要特性,方框图,典型应用电路,以及D类音频功率放大器参考设计IRAUDAMP9功能框图,主板和子板电路图以及材料清单,PCB布局图.
The AUIRS2092 is a high voltage, high performance Class D audio amplifier driver with PWM modulator and protection. In conjunction with two external MOSFET and a few external components, a complete Class D audio amplifier with protection can be realized. International Rectifier’s proprietary noise isolation technology allows high current gate drive stage and high speed low noise error amplifier reside on a single small silicon die.Open elements of PWM modulator section allow flexible PWM topology implementation.

AUIRS2092主要特性:
• Integrated analog input Class D audio amplifier driver in a small 16 pin package
• Floating inputs enable easy half bridge implementation
• Programmable bidirectional over-current protection with self-reset function
• Programmable preset deadtime for improved THD performances
• Start and stop click noise reduction
• High noise immunity
• ±100 V ratings deliver up to 500 W in output power
• Operates up to 800 kHz
• Leadfree, RoHS compliant
• Automotive Qualified†

AUIRS2092典型应用:
• Automotive mini component stereo systems
• Automotive powered speaker systems
• Automotive audio power amplifiers

图1.AUIRS2092方框图

图2.AUIRS2092典型连接电路图

图2.AUIRS2092 OTA输入噪音电压测量电路图

采用IRS2092S和IRFB4227的1.7 kW / 2-Ω单路D类音频功率放大器参考设计IRAUDAMP9
The IRAUDAMP9 reference design is a single-channel 1.7-kW ( @ 2?load) half-bridge Class D audio power amplifier. This reference design demonstrates how to use the IRS2092S Class D audio controller and external gate buffer, to implement protection circuits, and design an optimum PCB layout using the IRFB4227 (x 2 Pairs) TO-220 MOSFETs. This reference design may require additional heatsink or fan for normal operation (one-eighth of continuous rated power). The reference design provides all the required housekeeping power supplies for ease of use. The 1-channel design is capable of delivering higher than its rated power with provision of larger heat sink ( Rth <2?C / W).

参考设计主要特性:
Output Power: 1.7 kW Single channel (2 Ω load, 1kHz, THD+N=10%),
Residual Noise: 290μV, IHF-A weighted, AES-17 filter
Distortion: 0.07% THD+N @ 600W, 2Ω
Efficiency: 97% @ 1.7 kW, 2Ω
Multiple Protection Features: Output Over-current protection (OCP), high side and low side
Input Over-voltage protection (OVP),
Input Under-voltage protection (UVP),
Output DC-offset protection (DCP),
Over-temperature protection (OTP)
PWM Modulator: Self-oscillating half-bridge topology with optional clock synchronization

参考设计应用:
Pro-Audio amplifiers
Powered speakers
Active Sub-woofers
P.A. Systems
Car audio amplifier
Musical Instrument Amplifier

图3.1.7kW音频功率放大器参考设计外形图

图4.1.7kW音频功率放大器参考设计功能框图

图5.1.7kW音频功率放大器参考设计保护电路功能框图

图6.1.7kW音频功率放大器参考设计主板电路图

图7.1.7kW音频功率放大器参考设计主板输入/输出保护电路图

图8.1.7kW音频功率放大器参考设计主板电路图:Vaa,Vss和Vcc电源DC/DC转换器

图9.IRAUDAMP9子板电路图
IRAUDAMP9主板材料清单(BOM):



IRAUDAMP9子板材料清单(BOM):


IRAUDAMP9机械材料清单:


图10.IRAUDAMP9主板PCB布局图(顶层)

图11.IRAUDAMP9主板PCB布局图(底层)

图12.IRAUDAMP9子板PCB布局图(顶层)

图13.IRAUDAMP9子板PCB布局图(底层)