Cirrus CS3511立体声高效D类音频功率放大方案

Cirrus 公司的CS3511是立体声10W高效D类音频功率放大器，不需要散热器。CS3511集成了过流，过压和超温保护以及误差报告。系统级动态范围为99dB，5W输出时的THD+N为0.025%,通路间隔离为-104dB，单电源9-12V工作，主要用于有源扬声器，数字电视，手提媒体播放器坞站，迷你/微型音乐系统等。本文介绍了CS3511主要特性，方框图，差分和单端输入的立体声放大器电路，以及2 x 11 W CS3511数字放大器参考设计方框图，电路图和参加革命设计元件布局图。
Stereo 10 W High-efficiency Class-D Audio Power Amplifier
The CS3511 is a high-efficiency class-D PWM amplifier that integrates on-chip over-current, under-voltage, over-temperature protection, and error reporting. An onboard regulator generates a 5 VDC supply used to power the internal low-voltage analog and digital circuitry.
The low RDS(ON) outputs can source peak currents up to 2.7 A, deliver high efficiency, allow a small device package, and lower power supply voltage levels. The CS3511 is available in a 32-pin QFN package in Commercial grade (-10℃ to +70℃).
CS3511主要特性：
Closed-loop Advanced Architecture
True Spread Spectrum Modulation
Premium Quality Audio Amplification
– 99 dB Dynamic Range - System Level
– 0.025% THD+N @ 5 W - System Level
– -104 dB Channel Separation
Four Selectable Amplifier Gain Settings
Integrated Protection and Automatic Recovery for Over-current, Under-voltage, and Thermal Overload
Single-supply Operation (Typ. = 9-12 V)
No Bootstrap Capacitors Required
Low-power Standby Mode
Supports Differential or Single-ended Inputs
Thermally Enhanced 32-pin, 6 x 6 mm QFN Package Requires No External Heat Sink
CS3511主要应用：
Active Speakers
Portable Media Player Docking Stations
Mini/Micro Shelf Systems
Digital Televisions

图1。CS3511方框图

图2。CS3511典型连接框图：差分输入立体声放大器

图3。CS3511典型连接框图：单端输入立体声放大器
2 x 11 W CS3511数字放大器参考设计
The CRD3511-Q1 demonstrates the CS3511 high-efficiency Class-D amp...