Cirrus 公司的CS3511是立體聲10W高效D類音頻功率放大器，不需要散熱器。CS3511集成了過流，過壓和超溫保護以及誤差報告。系統級動態范圍為99dB，5W輸出時的THD+N為0.025%,通路間隔離為-104dB，單電源9-12V工作，主要用于有源揚聲器，數字電視，手提媒體播放器塢站，迷你/微型音樂系統等。本文介紹了CS3511主要特性，方框圖，差分和單端輸入的立體聲放大器電路，以及2 x 11 W CS3511數字放大器參考設計方框圖，電路圖和參加革命設計元件布局圖。
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主要應用：
Active Speakers
Portable Media Player Docking Stations
Mini/Micro Shelf Systems
Digital Televisions
圖1。CS3511方框圖
圖2。CS3511典型連接框圖：差分輸入立體聲放大器
圖3。CS3511典型連接框圖：單端輸入立體聲放大器
2 x 11 W CS3511數字放大器參考設計
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數字放大器參考設計主要特性：
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
圖4。2 x 11 W CS3511數字放大器參考設計方框圖
圖5。CRD3511-Q1參考設計電路圖
圖6。CRD3511-Q1參考設計元件布局圖
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