基于CS35L00设计的2.7W x 4高效D类音频放大技术

1、    基于CS35L00设计的2.7W x 4高效D类音频放大技术CS35L00是Cirrus公司的2.7W高效单声道D类音频放大器，采用无滤波器混合型D类架构，静态电流小于1mA，10% THD+N时能向4欧姆提供2.7W功率，A加权SNR为-98dB，主要用于手机，上网本，PND，有源扬声器和手提游戏机。本文介绍了CS35L00主要特性，方框图，SD和FSD模式以及HD和FHD模式的典型连接框图，CDB35L00-X4 放大器演示板主要特性，电路图和材料清单（BOM）。The CS35L00 is a 2.7 W high efficiency H

2、ybrid Class-D audio amplifieCS35L00是Cirrus公司的2.7W高效单声道D类音频放大器，采用无滤波器混合型D类架构，静态电流小于1mA，10% THD+N时能向4欧姆提供2.7W功率，A加权SNR为-98dB，主要用于手机，上网本，PND，有源扬声器和手提游戏机。本文介绍了CS35L00主要特性，方框图，SD和FSD模式以及HD和FHD模式的典型连接框图，CDB35L00-X4 放大器演示板主要特性，电路图和材料清单（BOM）。The CS35L00 is a 2.7 W high efficiency Hybrid Class-D audio amplif

3、ier with low idle current consumption and a selectable gain.The CS35L00 features an advanced closed-loop architecture to provide 0.02% THD+N at 1 W and -75 dB PSRR at 217 Hz.A flexible Hybrid Class-D output stage offers four modes of operation: Standard Class-D (SD) mode offers full audio bandwidth

4、and high audio performance; Hybrid Class-D (HD) mode offers a substantial reduction in idle power consumption with an integrated Class-H controller; Reduced Frequency Class-D (FSD) mode reduces the output switching frequency, producing lower electromagnetic interference (EMI); and Reduced Frequency

5、Hybrid Class-D (FHD) mode produces both the lower idle power consumption of HD mode and the reduced EMI benefits of FSD mode.Requiring minimal external components and PCB space, the CS35L00 is available in a 3.0 mm x 3.0 mm, 10-pin DFN package in Commercial grade (-10 to +70).CS35L00主要特性：Filterless

6、Hybrid Class-D Architecture <1 mA Quiescent Current 1 x 2.7 W into 4 ohm (10% THD+N) 1 x 2.1 W into 4ohm (1% THD+N) 1 x 1.6 W into 8 ohm (10% THD+N) 1 x 1.3 W into 8 ohm (1% THD+N)?Advanced Delta-Sigma ?Closed-loop Modulation 98 dB Signal-to-Noise Ratio (A-Weighted) 0.02% THD+N 1 W (SD & HD M

7、ode)?Integrated Protection and Automatic Recovery for Output Short-circuit and Thermal OverloadPin-compatible 9-ball WLCSP family for easy upgrade path CS35L01: +6 dB default GainCS35L03: +12 dB default GainPop and Click SuppressionCS35L00主要应用：Mobile PhonesLaptops/NetbooksPortable Navigation Devices

8、Active SpeakersPortable Gaming图1。CS35L00方框图图2。CS35L00 SD和FSD模式典型连接框图图3。CS35L00 HD和FHD模式典型连接框图Note:3. The value of the capacitance connected to the LFILT+ net should not exceed 4.7uF. Presence of a capacitance above 4.7uF will prevent proper HD and FHD operation.2.7 W x 4 CS35L00 放大器演示板The CDB35L00-X

9、4 demonstrates the CS35L00 high-efficiency Hybrid Class-D audio amplifier. This demonstration board implements a four-channel, quad amplifier system that delivers 2.7 W per full-bridge channel into 4-ohm loads using a single +5 V supply.Differential audio inputs can easily be connected through the J

10、10, J20, J30, and J40 headers. If desired, the gain can be adjusted through the optional input resistors.Component landings are available for an optional EMI output filter.The CDB35L00-X4 can be configured to evaluate the four operational modes and two gain settings of the CS35L00 amplifier. Mode, G

11、ain, and Shutdown control is available through the S1 switch. Hybrid control is vailable through the R13, R23, R33, and R43 resistors.图4。2.7 W x 4 CS35L00 放大器演示板外形图主要特性：Contains 4 CS35L00 Hybrid Class-D AmplifiersSelectable +6 dB or +12 dB GainSelectable Operational ModesDevice Shutdown ControlDelivers 2.7 W/Ch into 4ohm at 10 % THD+NDelivers 1.6 W/Ch into 8 ohm at 10 % THD+NDifferential Mono Analog Inputs for each CS35L00 AmplifierDemonstrates Recommended 4-Layer Layout and Grounding Arrangements Optional Output Filter Connections Optional Gain Adjustment ResistorsPowere