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 amplifier. This reference design implements a two-channel amplifier that delivers 9 W per full-bridge channel into 8 Ω 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.
2 x 11 W CS3511数字放大器参考设计主要特性：
Output Filters Optimized for 8 Ω Loads
Delivers 9 W/Ch into 8 Ω at 10 % THD+N
Delivers 11 W/Ch into 6 Ω at 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。2 x 11 W CS3511数字放大器参考设计方框图
图5。CRD3511-Q1参考设计电路图
图6。CRD3511-Q1参考设计元件布局图
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