Cirrus 2x11W CS3511数字放大器参考设计方案

Cirrus公司的CS3511是高性能立体声D类PWM放大器,集成了过流过压和超温保护以及误差报告. CS3511采用闭环架构,真正扩展频谱调制,系统级的动态范围为99dB,5W输出时系统级的THD+N为0.025%,通路隔离度为-96dB,单电源-12V工作,可用在有源扬声器,手提媒体播放扩展坞,迷你/微型机架系统和数字电视.本文介绍了CS3511的主要特性,方框图,单端输入和差分输入立体声放大器连接框图以及2 x 11 W CS3511 数字放大器参考设计的主要特性,方框图以及详细的电路图.

CS3511 High Performance Stereo Class-D 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度 to +70度).
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
96 dB Channel Separation
Three 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差分输入立体声放大器连接框图



图3. CS3511单端输入立体声放大器连接框图
2 x 11 W CS3511 数字放大器参考设计
The CRD3511-Q1 demonstrates the CS3511 high-efficiency Class-D amplifier. This reference design implements a two-channel amplifier that delivers 9 W per full-bridge channel into 8ohm loads using a single +12 V supply.
Standard RCA phono jacks are provided to easily interface single-ended analog input signals with the evaluation board. A source impedance matching circuit on the board allows the full performance of the CS3511 to be tested with any available audio source.
The audio power outputs are routed through an inductor/ capacitor 2nd order low-pass filter (LPF) to remove high-frequency components from the output signal, effectively
converting it from digital to analog.
On-board control switches easily change the configuration pins of the CS3511.
数字放大器参考设计主要特性:
Output Filters Optimized for 8 ohmLoads
Delivers 9 W/Ch into 8ohm at 10 % THD+N
Delivers 11 W/Ch into 6ohmat 10 % THD+N
Single-Ended Stereo Analog Inputs
Source Impedance Matching Circuit
Demonstrates Recommended 4-Layer Layout and Grounding Arrangements
Operated by Single +8.5-13.2 V Power Supply
Configured by On-Board Hardware Control
Control Mute, Sleep, and Gain Settings
Power and Fault Indicator LEDs
Indicates Under-Voltage, Over-Current, or Over-Temperature Faults
Versatile Binding Post Connectors for Power Supply and Speaker Outputs



图4.数字放大器参考设计方框图



图5.数字放大器参考设计CRD3511-Q1 电路图