參數(shù)資料
型號: TB2903HQ
元件分類: 音頻/視頻放大
英文描述: 29 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25
封裝: 1 MM PITCH, PLASTIC, HZIP-25
文件頁數(shù): 10/15頁
文件大?。?/td> 343K
代理商: TB2903HQ
TB2903HQ
2004-07-25
4
3.
Muting Function (pin 22)
Audio muting function is enabled when pin 22 is Low. When the time constant of the muting function is
determined by R1 and C4, it should take into account the pop noise. The pop noise which is generated when
the power or muting function is turned ON/OFF will vary according to the time constant. (Refer to Figure 4
and Figure 5.)
The pin 22 is designed to operate off 5 V.
Moreover, this terminal (pin 22) serves as the source switch of current of an internal mute circuit. And it is
designed so that the discharge current of this terminal (pin 22) may serve as 200
A. The outside pull-up
resistor R1 is determind on the basic of this value.
ex) When control voltage is changed in to 6 V from 5 V.
6 V/5 V
× 47 k = 56 k
To obtain enough mute attenuation, a series resistor, R1 at pin 22 should be 47 k
or more.
VCC
Small current capacity switch
Battery
Stand-By
VCC
From microcomputer
Battery
Stand-By
– Standby Switch Method –
Figure 3
– Conventional Method –
VCC
Large current capacity switch
Battery
VCC
From
microcomputer
Battery
Relay
Figure 5
Mute Attenuation
VMUTE (V)
Pin 22 control voltage: VMUTE (V)
ATT – VMUTE
Mute
a
ttenua
tion
ATT
(dB
)
Figure 4
Muting Function
0
120
100
80
60
40
20
0
20
0.5
1
1.5
2
2.5
3
VCC = 13.2 V
f
= 1kHz
RL = 4
VOUT = 20dBm
22
1 k
R1
5 V
Mute ON/OFF
control
C4
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