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參數(shù)資料
| 型號： | NCS8353MNTXG |
| 廠商： | ON Semiconductor |
| 文件頁數(shù)： | 5/14頁 |
| 文件大?。?/td> | 0K |
| 描述： | 20W CLASS D AUDIO AMP 32QFN |
| 標準包裝： | 2,500 |
| 類型： | D 類 |
| 輸出類型： | 2 通道（立體聲） |
| 在某負載時最大輸出功率 x 通道數(shù)量： | 20W x 2 @ 8 歐姆 |
| 電源電壓： | 8 V ~ 26 V |
| 特點： | 消除爆音，差分輸入，靜音，短路和熱保護，關機 |
| 安裝類型： | 表面貼裝 |
| 供應商設備封裝： | 32-QFN（5x5） |
| 封裝/外殼： | 32-VFQFN 裸露焊盤 |
| 包裝： | 帶卷 (TR) |
NCS8353
http://onsemi.com
13
Pop and Click Suppression
Pop and click is often a function of charge difference from
input coupling and bypass capacitors, momentary
differential offset voltages across the speaker, or state
changes of the input source (codec) that cause an abrupt
change in current to flow through the loudspeaker. In all
cases these pop and click phenomena occur during the
following power sequences:
Power supply power-up or power down (codec or amp).
Entering or releasing from shutdown/mute (codec or
amp).
State changes in the audio codec; e.g., switching
between audio sources.
Due to the voltage changes in the audio signal chain a
momentary current will flow through the loudspeaker.
When current flows through the voice coil of a loudspeaker
it causes the diaphragm to move thus causing a popping and
clicking sound.
The NCS8353 includes pop and click suppression
circuitry that creates a slow ramp to bias the amplifier during
the previously mentioned power sequences. In order to
eliminate “pop and click” noises during transition, the
output power in the load must not be established or cutoff
suddenly. When logic high is applied to the shutdown pin,
the internal biasing voltage rises quickly and once the output
DC level is around the common mode voltage, the gain is
established slowly. This method to turn on the device is
optimized in terms of rejection of “pop and click” noises.
The device has the same behavior when it is turned-off by a
logic low on the enable pin. No power is delivered to the load
60 ms after a falling edge on the enable pin. Due to the fast
turn on and off times, the shutdown signal can be used as a
mute signal as well.
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