IR公司的IRS2052M是两路300W(4 Ω)半桥D类音频功率放大器,集成了两个高压高性能D类音频放大器驱动器和PWM调制器,具有内部时钟和超温保护特性,超温传感器输入,故障报告输出和剪辑检测输出.主要用在AV接收器,家庭影院系统,超低音扬声器,迷你型立体声,乐器和汽车后装放大器.本文介绍了IRS2052M主要特性,方框图, 典型应用电路图以及采用IRS2052M和IRF6775的300Wx2路D类音频功率放大器IRAUDAMP10主要特性,指标,电路图和材料清单,PCB布局图.
The IRS2052M digital audio driver is a two channel version of IRS2092(S) with additional
features, such as internal clock and over temperature protection. The IRS2052M features clipping detection outputs, on-chip over temperature detection, over temperature sensor inputs and a fault reporting output.
The IRS2052M integrates two channels of high voltage, high performance Class D audio amplifier drivers with PWM modulators and protections. In conjunction with external MOSFET and external components, a complete 2 channel Class D audio amplifier can be realized. The IRS2052M is designed with floating analog inputs and protection control interface pin especially for half bridge topology. High and low side MOSFET are protected from over current conditions by a programmable bi-directional current sensing. Essential elements of PWM modulator section allow flexible system design. A small MLPQ48 package enhances the benefit of smaller size of Class D topology. The IRS2052M is a lead-free, ROHS compliant.

IRS2052M主要特性:
• 2 channel integrated analog input Class D audio amplifier driver
• Versatile protection control enabling latched, non-latched, or host controlled shutdown function
• Integrated clock oscillator
• Clipping detection
• External thermal sensor input
• On-chip thermal shutdown with warning
• Programmable over current protection
• Programmable dead-time generation
• Start and stop click noise reduction
• Under voltage protection
• High noise immunity

图1. IRS2052M方框图

图2. IRS2052M典型应用电路图

采用IRS2052M和IRF6775的300Wx2路D类音频功率放大器IRAUDAMP10
The IRAUDAMP10 Demo board is a reference design which uses only one IC (IRS2052M) to derive appropriate input signals, amplify the audio input, and achieve a two-channel 300 W/ch (4?, THD+N=1%) half-bridge Class D audio power amplifier. The reference design demonstrates how to use the IRS2052M Class D audio controller and gate driver IC, implement protection circuits, and design an optimum PCB layout using IRF6775 DirectFET MOSFETs. The reference design contains all the required housekeeping power supplies for ease of use. The two-channel design is scalable, for power and number of channels.

300Wx2路D类音频功率放大器主要特性:
Output Power: 300W x 2 channels (4?, THD+N=1%)
or 370W x 2 channels (4?, THD+N=10%)
Residual Noise: 220V, IHF-A weighted, AES-17 filter
Distortion: 0.008% THD+N @ 100W, 4?
Efficiency: 90% @ 300W, 4?, single-channel driven, Class D stage
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 with optional clock synchronization

300Wx2路D类音频功率放大器应用:
AV receivers
Home theater systems
Mini component stereos
Powered speakers
Sub-woofers
Musical Instrument amplifiers
Automotive after market amplifier

300Wx2路D类音频功率放大器主要指标:



图3. 300Wx2路D类音频功率放大器IRAUDAMP10外形图

图3. IRAUDAMP系统级框图

图4.IRAUDAMP10电路图
IRAUDAMP10材料清单:



IRAUDAMP10机械类材料清单:


图5.IRAUDAMP10 PCB布局图(顶层)

图6.IRAUDAMP10 PCB布局图(底层)