IR IRAUDAMP7 D类放大器参考设计

IR 公司的IRAUDAMP7 D类音频功率放大器参考设计,采用IRS2092数字音频驱动器,其输出功率从25W到250W,在60W 4欧姆是的THD+N为0.05%,500W 8欧姆时的效率达到90%,具有多种保护方式,广泛应用在AV接收器,家庭影院系统,大功率扬声器,重低音用扩音器,音乐器材放大器以及汽车电子等.本文介绍了IRAUDAMP7的主要特性, D类放大器参考设计方框图, 系统级方框图, A通道和B通道放大器电路图, 放大器保护电路图以及所用电子元件材料清单(BOM).

IR 25W-500W Scalable Output Power Class D Audio Power Amplifier Reference Design Using the IRS2092 Protected Digital Audio Driver



图1. IRAUDAMP7D参考设计外形图
The IRAUDAMP7D reference design is a two-channel Class D audio power amplifier that features output power scalability. The IRAUDAMP7D offers selectable half-bridge (stereo) and full-bridge (bridged) modes.

This reference design demonstrates how to use the IRS2092 Class D audio driver IC, along with IR’s digital audio dual MOSFETs, such as IRFI4024H-117P, IRFI4019H-117P, IRFI4212H-117P and IRFI4020H-117P, on a single layer PCB. The design shows how to implement peripheral circuits on an optimum PCB layout using a single sided board.
The resulting design requires a small heatsink for normal operation (one-eighth of continuous rated power).

The reference design provides all the required housekeeping power supplies and protections.

IRAUDAMP7D参考设计应用范围:
AV receivers
Home theater systems
Mini component stereos
Powered speakers
Sub-woofers
Musical Instrument amplifiers
Automotive after market amplifiers
IRAUDAMP7D参考设计主要特性:
Output Power: Scalable output power from 25W- 500W
Residual Noise: 200 μV, IHF-A weighted, AES-17 filter
Distortion: 0.05 % THD+N @ 60W, 4 Ω
Efficiency: 90 % @ 500W, 8 Ω, Class D stage
Multiple Protection Features:
Over-current protection (OCP), high side and low side MOSFET
Over-voltage protection (OVP),
Under-voltage protection (UVP), high side and low side MOSFET
DC-protection (DCP),
Over-temperature protection (OTP)
PWM topology: Self-oscillating PWM, half-bridge or full-bridge topologies selectable



图2.简化IRAUDAMP7D D类放大器参考设计方框图



图3.IRAUDAMP7D 系统级方框图



图4.IRAUDAMP7D放大器电路图(通道A)



图5.IRAUDAMP7D放大器电路图(通道B)



图6.IRAUDAMP7D放大器保护电路图



图7.IRAUDAMP7D桥式预放大器电路图
IRAUDAMP7D-150 电子元件材料清单(BOM)







IRAUDAMP7D 模块材料表