IR公司的IRAUDAMP9是采用IRS2092S和IRFB4227的單路1.7 kW / 2-Ω 數字D類音頻功率放大參考設計,輸出功率1.7kW(2 Ω 負載, 1kHz, THD+N=10%),THD+N失真0.07%(@ 600W, 2Ω),效率97%(@ 1.7 kW, 2Ω),具有多種輸出保護特性如OCP,OVP,UVP,DCP和OTP,主要用于專業音響放大器,揚聲器,有源亞低音,功率放大器,汽車音頻放大器和樂器放大器.本文介紹了AUIRS2092主要特性,方框圖,典型應用電路,以及D類音頻功率放大器參考設計IRAUDAMP9功能框圖,主板和子板電路圖以及材料清單,PCB布局圖.
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典型應用:
• Automotive mini component stereo systems
• Automotive powered speaker systems
• Automotive audio power amplifiers
圖1.AUIRS2092方框圖
圖2.AUIRS2092典型連接電路圖
圖2.AUIRS2092 OTA輸入噪音電壓測量電路圖
采用IRS2092S和IRFB4227的1.7 kW / 2-Ω單路D類音頻功率放大器參考設計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).
參考設計主要特性:
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
參考設計應用:
Pro-Audio amplifiers
Powered speakers
Active Sub-woofers
P.A. Systems
Car audio amplifier
Musical Instrument Amplifier
圖3.1.7kW音頻功率放大器參考設計外形圖
圖4.1.7kW音頻功率放大器參考設計功能框圖
圖5.1.7kW音頻功率放大器參考設計保護電路功能框圖
圖6.1.7kW音頻功率放大器參考設計主板電路圖
圖7.1.7kW音頻功率放大器參考設計主板輸入/輸出保護電路圖
圖8.1.7kW音頻功率放大器參考設計主板電路圖:Vaa,Vss和Vcc電源DC/DC轉換器
圖9.IRAUDAMP9子板電路圖
IRAUDAMP9主板材料清單(BOM):
IRAUDAMP9子板材料清單(BOM):
IRAUDAMP9機械材料清單:
圖10.IRAUDAMP9主板PCB布局圖(頂層)
圖11.IRAUDAMP9主板PCB布局圖(底層)
圖12.IRAUDAMP9子板PCB布局圖(頂層)
圖13.IRAUDAMP9子板PCB布局圖(底層) |
