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发布者:微桥 发布时间:2009/12/31 阅读:7272次   
PT5306-2.5W无滤波器D类音频功率放大器


PT5306-2.5W Filter-free Class D Audio Power Amplifier

PT5306是一款单电源供电,高效率的2.5W D类音频放大器。其内部采用低噪声,无滤波器的PWM调制结构,可以省去输出滤波器,减少外部元件和电路板面积,降低成本。 PT5306的工作电压范围为2.7V~5.5V,采用5V单电源供电,驱动4Ω负载时可输出2.5W功率,同时THD+N小于10%。PT5306与AB类放大器相比具有高效率的优点。在5V电源下,驱动8Ω负载,输出功率1100mW时,效率达82%;输出功率400mW时效率可达90%以上。
PT5306的典型静态电流为4mA,在低功耗关断模式的关断电流小于0.5μA,在217Hz频率下的电源抑制比为70dB,可有效抑制“pop & click”声,内置过流保护、过热保护功能,只需3个外部元件,采用3mm×3mm DFN8封装。

GENERAL DESCRIPTION
 

The PT5306 is a single supply, high efficiency 2.5W class D audio amplifier. A low noise, filterless PWM architecture eliminates the output filter, reducing external component count, board area consumption, system cost, and simplifying design.

The PT5306 is designed to meet the demands of mobile phones and other portable communication devices. Operating on a single 5V supply, it is capable of driving a 4Ω speaker load at a continuous average output of 2.5W with less than 10% THD+N. Its flexible power supply requirements allow operation from 2.5V to 5.5V.

The PT5306 has high efficiency with speaker loads compared to a typical Class AB amplifier. With a 5V supply driving an 8Ω speaker, the IC’s efficiency for a 100mW power level is 82%, and reaching 90% at 400mW output power.
 
FEATURES
 

¨          2.5W Into 4 Ω from a 5V Supply at THD=10%(Typ)

¨          High Efficiency: 90% at 400mW, 5V power

¨          supply and 8Ω Speaker,

¨          4mA Quiescent Current

¨          0.5uA Shutdown Current

¨          70dB PSRR at 217Hz

¨          Advanced pop & click circuitry

¨          Over current limiter

¨          Thermal overload protection

¨          Low power shutdown mode

¨          Only Three External Components

¨          Wide Supply Voltage (2.5V to 5.5V)

¨          Space Saving Packages: 9 Bump SMD package

¨          3mm × 3mm DFN8 package
 
APPLICATIONS
 

¨          Cell Phones

¨          Handheld Computers and PDAs

¨          Portable electronic device
 
TYPICAL APPLICATIONS
 
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