IR 公司的IRS2053M集成了三路高压高性能D类音频功率放大器驱动器和PWM调制器和保护电路.和外接MOSFET以及元件一起,可以实现完整的3路D类音频功率放大器.本文介绍了IRS2053M 主要特性, 功能方框图, 典型连接框图, OTA输入噪音电压测试电路图以及采用IRS2053M 和IRF6665的120Wx3路D类音频功率放大器参考设计IRAUDAMP11主要特性, D类功率放大器方框图和系统级IRAUDAMP11方框图,电路图以及所用电材料清单和机械材料清单.
The IRS2053 integrates three 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 3 channel Class D audio amplifier can be realized. The IRS2053 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 IRS2053M digital audio driver is a three channel Class D audio driver housed in a 48 pin MLPQ. The IRS2053M features clipping detection outputs, DC offset detection input, over temperature sensor inputs and a fault reporting output.

IRS2053M 主要特性:

• 3 channel integrated analog input Class D audio amplifier drivers
• Versatile protection control enabling latched, nonlatched, or host controlled shutdown function
• DC offset detection input
• Clipping detection
• Thermal sensor inputs
• Fault output
• Programmable over current protection
• Programmable dead-time generation
• Startup click noise reduction
• Under voltage protection
• High noise immunity

图1. IRS2053M 功能方框图

图2. IRS2053M 典型连接框图

图3. IRS2053M  OTA输入噪音电压测试电路图

采用IRS2053M 和IRF6665的120Wx3路D类音频功率放大器参考设计

120W x 3 Channel Class D Audio Power Amplifier Using the IRS2053M and IRF6665

图4.120Wx3路D类音频功率放大器IRAUDAMP11外形图

The IRAUDAMP11 Demo board is a reference design which uses only one IC (IRS2053M) to derive appropriate input signals, amplify the audio input, and achieve a three-channel 120 W/ch (4Ω, THD+N=1%) half-bridge Class D audio power amplifier. The reference design demonstrates how to use the IRS2053M Class D audio controller and gate driver IC, implement protection circuits, and design an optimum PCB layout using IRF6665 DirectFET MOSFETs. The reference design contains all the required housekeeping power supplies for ease of use. The three-channel design is scalable, for power and number of channels.
IRAUDAMP11主要特性:
Output Power: 120W x 3 channels (4Ω, THD+N=1%) or 170W x 3 channels (4Ω, THD+N=10%)
Residual Noise: 220V, IHF-A weighted, AES-17 filter
Distortion: 0.02% THD+N @ 60W, 4Ω
Efficiency: 90% @ 120W, 4Ω, 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
IRAUDAMP11指标:


IRAUDAMP11应用:
AV receivers
Home theater systems
Mini component stereos
Powered speakers
Sub-woofers
Musical Instrument amplifiers
Automotive after market amplifiers

图5.简化IRAUDAMP11 D类功率放大器方框图

图6.系统级IRAUDAMP11方框图

图7.IRAUDAMP11 D类功率放大器电路图
IRAUDAMP11电材料清单(BOM):



IRAUDAMP11机械材料清单(BOM):