CS3511 立体声10W高效D类音频功率放大器电路特点及应用设计参考

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**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 thatintegrates on-chip over-current, under-voltage, over-temperatureprotection, and error reporting. An onboard regulator generates a 5VDC supply used to power the internal low-voltage analog anddigital circuitry.
The low RDS(ON) outputs can source peak currents up to 2.7 A,deliver high efficiency, allow a small device package, and lowerpower supply voltage levels. The CS3511 is available in a 32-pinQFN 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 NoExternal 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-Q1demonstrates the CS3511 high-efficiency Class-D amplifier. Thisreference design implements a two-channel amplifier that delivers 9W per full-bridge channel into 8 Ω loads using a single +12 Vsupply.
Standard RCA phono jacks are provided to easily interfacesingle-ended analog input signals with the evaluation board. Asource impedance matching circuit on the board allows the fullperformance of the CS3511 to be tested with any available audiosource.
The audio power outputs are routed through an inductor/ capacitor2nd order low-pass filter (LPF) to remove high-frequency componentsfrom the output signal, effectively converting it from digital toanalog.
On-board control switches easily change the configuration pins ofthe 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 GroundingArrangements
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-TemperatureFaults
Versatile Binding Post Connectors for Power Supply and SpeakerOutputs

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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