3-W 单声道 Filterless–D类音频放大器3-W Mono Filterless Class-D Audio Power Amplifier CXAR41171是一款高效率的，3W单声道的D类音频放大器。它用一种低噪声的、filterlessPWM的架构，无需输出滤波器，减少外围器件数，降低系统成本，简化系统设计。当电源电压为5V时，CXAR41171 能在输出负载为4Ω的扬声器上，

   产品概述 返回TOPLmb嘉泰姆

       CXAR41171是一款高效率的，3W单声道的D类音频放大器。它用一种低噪声的、filterlessPWM的架构，无需输出滤波器，减少外围器件数，降低系统成本，简化系统设计。当电源电压为5V时，CXAR41171 能在输出负载为4Ω的扬声器上，输送出3W/10%或2W/1%的输出功率及失真度。与AB类放大器相比，CXAR41171具有高效能的特性。当电源电压3.6 V而输出负载为8Ω扬声器，输出功率400 mW时其效率为88%。在移动电话听筒及耳机的装置上，CXAR41171是能输出悦耳音调的音频功率放大器。CXAR41171的放大音量是允许由外部各音源独立控制的。CXAR41171采用TDFN以及WCSP封装。The CXAR41171 is a high efficiency, 3W mono class-D audio power amplifier. A low noise, filterless PWM architecture eliminates the output filter, reducing external component count, system cost, and simplifying design. Operating in a single 5V supply, CXAR41171 is capable of driving 4Ω speaker load at a continuous average output of 3W/10% THD+N or 2W/1% THD+N. The CXAR41171 has high efficiency with speaker load compared to a typical class AB amplifier. With a 3.6V supply driving an 8Ω speaker , the efficiency for a 400mW power level is 88%. In cellular handsets, the earpiece, speaker phone, and melody ringer can each be driven by the CXAR41171. The gain of CXAR41171 is externally configurable which allows independent gain control from multiple sources by summing signals from separate sources. The CXAR41171 is available in space-saving WCSP and TDFN packages.

   产品特点 返回TOPLmb嘉泰姆

Lmb嘉泰姆

• 单一调变方案来减少EMI干扰Lmb嘉泰姆

• 工作电压3.6V,负载8Ω的扬声器:Lmb嘉泰姆

- 输出功率400mW时，效率高达88%Lmb嘉泰姆

- 输出功率100mW时，效率高达80%Lmb嘉泰姆

• 静态电流 2.4mA，关断电流0.5uALmb嘉泰姆

• 工作电压2.5 V至5.5 VLmb嘉泰姆

• 采用优化的PWM输出架构，无需输出LC滤波器</p>

• 高PSRR(-72dB)，无需稳压器</p>

• 全差动设计用以抑制射频干扰，无需旁通电容</p>

• 高CMRR，输入无需耦合电容器</p>

• 内部工作频率250kHzLmb嘉泰姆

• 内含POP 及Click噪音抑制电路Lmb嘉泰姆

• 1.5mmx1.5mm WCSP 及 3mmx3mm TDFN-8 封装Lmb嘉泰姆

• 符合RoHS规范及Pb-FreeLmb嘉泰姆

􀁺 Unique Modulation Scheme Reduces EMI EmissionsLmb嘉泰姆

􀁺 Efficiency at 3.6V With an 8-Ω Speaker:Lmb嘉泰姆

− 88% at 400 mWLmb嘉泰姆

− 80% at 100 mWLmb嘉泰姆

􀁺 Low 2.4-mA Quiescent Current andLmb嘉泰姆

0.5-μA Shutdown CurrentLmb嘉泰姆

􀁺 2.5V to 5.5V Wide Supply VoltageLmb嘉泰姆

􀁺 Shutdown Pin Compatible with 1.8V Logic GPIOLmb嘉泰姆

􀁺 Optimized PWM Output Stage EliminatesLmb嘉泰姆

LC Output FilterLmb嘉泰姆

􀁺 Improved PSRR (−72 dB) Eliminates Need for aLmb嘉泰姆

Voltage RegulatorLmb嘉泰姆

􀁺 Fully Differential Design Reduces RF RectificationLmb嘉泰姆

and Eliminates Bypass CapacitorLmb嘉泰姆

􀁺 Improved CMRR Eliminates Two InputLmb嘉泰姆

Coupling CapacitorsLmb嘉泰姆

􀁺 Internally Generated 250-kHz SwitchingLmb嘉泰姆

FrequencyLmb嘉泰姆

􀁺 Integrated Pop and Click Suppression CircuitryLmb嘉泰姆

􀁺 1.5mm× 1.5mm Wafer Chip Scale Package (WCSP)Lmb嘉泰姆

and 3mm× 3mm TDFN-8 packageLmb嘉泰姆

􀁺 RoHS compliant and 100% lead(Pb)-freeLmb嘉泰姆

   应用范围 返回TOPLmb嘉泰姆

Lmb嘉泰姆

• 无线或移动电话和PDA应用􀁺Lmb嘉泰姆

Ideal for Wireless or cellular Handsets and PDAsLmb嘉泰姆

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