CXAR41278立体声音频功率放大器驱动2.0W的连续有效值电源在5V电源电压下桥接负载BTL模式每个通道4Ω负载立体声输入多路复用器静音和关机控制输出功率钳位功能

CXAR41278是一款24针TSSOP热敏垫封装或24针QFN封装的立体声音频功率放大器。它可以驱动2.0W的连续有效值电源，在5V电源电压下，以桥接负载（BTL）模式，每个通道4Ω负载。在上述操作条件下，其THD小于1%。当静音启动时，CXAR41278可以使输出静音。对于低电流消耗应用程序，支持SHDN模式以在CXAR41278空闲时禁用它。CXAR41278还支持两个输入路径，这意味着可以在同一个PCB中设置两个不同的增益回路，并通过设置IN1/IN2引脚来选择其中一个。提高了硬件设计的灵活性。CXAR41278还支持一个额外的功能——最大输出功率钳位功能，以防止扬声器烧坏。
Depop电路集成
·1%THD+N时的输出功率，VDD=5V
--2.0W/CH（典型）到4Ω负载
--1.3W/CH（典型）进入8Ω负载
·10%THD+N时的输出功率，VDD=5V
--2.6W/CH（典型）到4Ω负载
--1.6W/CH（典型）进入8Ω负载
最大输出功率夹紧电路集成
桥梁捆绑荷载（BTL）
·立体声输入多路复用器
提供静音和关机控制

目录

1.产品概述       2.产品特点     

3.应用范围       4.技术规格书下载（PDF文档）

5.产品封装       6.电路原理图  

7.相关产品

   产品概述 返回TOP

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The CXAR41278 is a stereo audio power amplifier in 24pin TSSOP thermal pad package or 24pin QFN package. It can drive 2.0W continuous RMS power into 4Ω load per channel in Bridge-Tied Load (BTL) mode at 5V supply voltage. Its THD is smaller than 1% under the above operation condition. The CXAR41278 can mute the output when Mute is activated. For the low current consumption applications, the SHDN mode is supported to disable the CXAR41278 when it is idle. The current consumption can be further reduced to below 5μA. The CXAR41278 also supports two input paths, that means two different gain loops can be set in the same PCB and choosing either one by setting IN1/IN2 pin. It enhances the hardware designing flexibility. The CXAR41278 also supports an extra function -- the maximum output power clamping function to protect the speakers from burned-out.

   产品特点 返回TOP

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„ Depop Circuitry Integrated 

„ Output Power at 1% THD+N, VDD=5V 

--2.0W/CH (typical) into a 4Ω Load 

--1.3W/CH (typical) into a 8Ω Load 

„ Output Power at 10% THD+N, VDD=5V 

--2.6W/CH (typical) into a 4Ω Load 

--1.6W/CH (typical) into a 8Ω Load

„ Maximum Output Power Clamping Circuitry Integrated 

„ Bridge-Tied Load (BTL) 

„ Stereo Input MUX 

„ Mute and Shutdown Control Available 

„ Surface-Mount Power Package 24-Pin TSSOP-P & 24-Pin QFN Available

   应用范围 返回TOP

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„ Stereo Power Amplifiers for Notebooks or Desktop Computers 

„ Multimedia Monitors 

„ Stereo Power Amplifiers for Portable Audio Systems

   技术规格书（产品PDF) 返回TOP 

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产品封装图 返回TOP

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电路原理图 返回TOP

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Stereo Audio Amplifier
Part NO.	VDD  (V) min	VDD  (V) max	POUT THD=1%  (W,Ohm)	POUT(mW) THD=10% (W,Ohm)	PSRR  (dB)	Gain  setting	Enable  Active	Note	Package
CXAR41277	4.5	5.5	2.0, 4	2.5, 4	68	Fixed/ADJ	High	BTL, De-pop	TSSOP-20(FD)
CXAR41278	--	6	2.0,   4	2.6,   4	65	ADJ	Low/High	BTL, Mute, De-pop,  POUT(max) Clamping	TSSOP-24(FD)/   QFN4X4-24
CXAR41279	3	5.5	1.2,   4	2.0,   4	68	Fixed/ADJ	Low	DC  volume control,  PC-Beep	TSSOP-28(FD)/   TQFN5X5-28
CXAR41280	4.5	5.5	1.9,   4	2.6,   4	50	Fixed	High	BTL,   SE, OTP	SOP-16(FD)
CXAR41281	3	5.5	1.5,   4	2.1,   3	--	ADJ	Low/High	BTL,   De-pop	TQFN3X3-16