IR公司的IRS2052M是兩路300W(4 Ω)半橋D類音頻功率放大器,集成了兩個高壓高性能D類音頻放大器驅動器和PWM調制器,具有內部時鐘和超溫保護特性,超溫傳感器輸入,故障報告輸出和剪輯檢測輸出.主要用在AV接收器,家庭影院系統,超低音揚聲器,迷你型立體聲,樂器和汽車后裝放大器.本文介紹了IRS2052M主要特性,方框圖, 典型應用電路圖以及采用IRS2052M和IRF6775的300Wx2路D類音頻功率放大器IRAUDAMP10主要特性,指標,電路圖和材料清單,PCB布局圖.
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
圖1. IRS2052M方框圖
圖2. IRS2052M典型應用電路圖
采用IRS2052M和IRF6775的300Wx2路D類音頻功率放大器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類音頻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: 220V, 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類音頻功率放大器應用:
AV receivers
Home theater systems
Mini component stereos
Powered speakers
Sub-woofers
Musical Instrument amplifiers
Automotive after market amplifier
300Wx2路D類音頻功率放大器主要指標:
圖3. 300Wx2路D類音頻功率放大器IRAUDAMP10外形圖
圖3. IRAUDAMP系統級框圖
圖4.IRAUDAMP10電路圖
IRAUDAMP10材料清單:
IRAUDAMP10機械類材料清單:
圖5.IRAUDAMP10 PCB布局圖(頂層)
圖6.IRAUDAMP10 PCB布局圖(底層) |
