LM3886、LM4766、LM1876这几种常见芯片都自带了开关机静噪的功能，通过外围的一些简单电路就可以实现开关机静噪功能。

其中LM3886、LM4766的静噪外围电路是完全相同的，官方的PDF也给出了具体的接法，只是LM1876没有给出，实践中安装LM4766的线路板也可以安装LM1876，并且也可以实现开关机静噪功能，下面贴出一些图片供大家参考。

静噪.jpg (19.39 KB, 下载次数: 99)

​我有一疑问，LM4766和LM1876的内部静噪电路不一样，LM4766是低电位工作，LM1876是高电位工作，但是实践中LM4766的静噪电路换上LM1876芯片也可以工作！不知原因何在？

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​ 1876是高电平静音有效，就是无输出，静噪端低电平或者负压时均可工作

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LM1876的MUTE和关断功能如何用手册里写得很详细，照办就是了。

MUTE MODE

By placing a logic-high voltage on the mute pins, the signal

going into the amplifiers will be muted. If the mute pins are

left floating or connected to a logic-low voltage, the amplifiers

will be in a non-muted state. There are two mute pins,

one for each amplifier, so that one channel can be muted

without muting the other if the application requires such a

configuration. Refer to the Typical Performance Characteristics

section for curves concerning Mute Attenuation vs

Mute Pin Voltage.

STANDBY MODE

The standby mode of the LM1876 allows the user to drastically

reduce power consumption when the amplifiers are

idle. By placing a logic-high voltage on the standby pins, the

amplifiers will go into Standby Mode. In this mode, the current

drawn from the VCC supply is typically less than 10 μA

total for both amplifiers. The current drawn from the VEE supply

is typically 4.2 mA. Clearly, there is a significant reduction

in idle power consumption when using the standby mode.

There are two Standby pins, so that one channel can be put

in standby mode without putting the other amplifier in

standby if the application requires such flexibility. Refer to

the Typical Performance Characteristics section for

curves showing Supply Current vs. Standby Pin Voltage for

both supplies.

回复 支持 反对

​同样功率下，LM1876音质在LM3886之上。

国半在国内有封片厂，wafer厂都在国外。

自从TI收购国半后，压减产品线，也没有在国内建新厂。

汕头国半不在此列。

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​是做2.1声道音响吗？这个搭配还是可以的，注意LM1876上一定要加大散热器，否则很容易烧管！

其实如果功率需要不是很大的话，TDA1521+LM3886也是不错的选择！

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​LM1875是25W的

LM1876是双20W的。

LM4766是双40W的。

个人感觉LM1876跟LM4766都非常好，LM1875就稍微差了点点。其实最好听的还是LM3886。