參數(shù)資料
型號(hào)： LA4820M
廠商： Sanyo Electric Co.,Ltd.
英文描述： Monaural Speaker/Stereo Headphone Power Amplifier
中文描述： 單聲道喇叭/立體聲耳機(jī)功率放大器
文件頁(yè)數(shù)： 14/20頁(yè)
文件大?。?/td> 677K
代理商： LA4820M
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An equivalent circuit for the mute circuit is shown on the previous page. If the power supply is turned on, the external capacitor
is charged by the internal constant current; once the voltage reaches 0.75 V (the switching level), mute turns off and the pin 2
DC voltage stabilizes at approximately 1.2 V. To turn mute on, short through a resistor to pull down pin 2. In this way,
smoothing is applied by using an external capacitor and resistor to prevent switching noise when mute is turned on/off.
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The mute-on/off time during normal operation is as shown below.
2. Common amplifier control switch
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When the headphone output is connected to other equipment, in an application set in which the common amplifier output (jack
common pin) may be connected to GND causing overcurrent to flow from the common amplifier, it is necessary to turn off the
common amplifier. In such an application, it is recommended to use the common capacitor scheme shown in Sample Application
Circuit 2 where pin 11 is grounded to turn off the common amplifier.
c
An equivalent circuit for the switching circuit is shown below.
c
PWRC-off condition
V
S11
%
0.4 V
3. H
z
P/SP switch
c
This circuit uses a headphone jack with a switch to detect the headphone plug-in/out and automatically switch between the H
z
P
amplifier and the MONO amplifier. When the H
z
P amplifier is operating, the MONO amplifier is turned off, and when the
MONO amplifier is operating, the H
z
P amplifier is turned off.
c
Smoothing is applied by using an external capacitor and resistor in order to prevent switching shock noise.
c
Open H
z
P condition
V
S14
%
0.2 V
Mute-off time
6
8 ms
Mute on
Pin 2 discharging
Mute-on time
6
9 ms
When 270 k
and 0.033 μF are used:
Mute off
Pin 2 charging
to
LA4820M
No.5205-14/20
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