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參數資料
| 型號： | TB2904HQ |
| 廠商： | Toshiba Corporation |
| 英文描述： | Maximum Power 43 W BTL ?4-ch Audio Power IC |
| 中文描述： | 最大功率43糯橋接？4通道音頻功率IC |
| 文件頁數： | 4/16頁 |
| 文件大?。?/td> | 272K |
| 代理商： | TB2904HQ |
TB2904HQ(o)
2004-03-26
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 R
1
and C
4
,
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 so that the outside pull-up resistor R
1
is determined 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
Additionally, as the V
CC
is rapidly falling, the IC internal low voltage muting operates to eliminate the
large pop noise basically.
The low voltage muting circuit pull 200
μ
A current into the IC so that the effect of the internal low
voltage muting does not become enough if the R
1
is too small value.
To obtain enough operation of the internal low voltage muting, a series resistor, R
1
at pin 22 should be
47 k
or more.
V
CC
Small current capacity switch
Battery
Stand-By
V
CC
From microcomputer
Battery
Stand-By
– Standby Switch Method –
Figure 3
– Conventional Method –
V
CC
Large current capacity switch
Battery
V
CC
From
microcomputer
Battery
Relay
Pin 22 control voltage: V
MUTE
(V)
ATT – V
MUTE
M
0
120
100
80
60
40
20
0
20
0.5
1
1.5
2
2.5
3.5
VCC
=
13.2 V
f
=
1 kHz
RL
=
4
Vout
=
7.75 Vrms
(20dBm)
3
Figure 5 Mute Attenuation
V
MUTE
(V)
22
1 k
R
1
5 V
Mute ON/OFF
control
C
4
Figure 4 Muting Function
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TB2905HQ | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:Class KB High-Efficiency, Low-Frequency Power Amplifier IC Maximum Power: 47 W x 4 Channels |
| TB2905HQ(O) | 功能描述:音頻放大器 25W x 4ch Class-KB Car Pwr Amp RoHS:否 制造商:STMicroelectronics 產品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TB2906HQ | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:Maximum Power 43 W BTL x 4-ch Audio Power IC |
| TB2913HQ | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:Maximum Power 47 W BTL 】 4-ch Audio Power IC |
| TB2915AHQ(O) | 制造商:Toshiba America Electronic Components 功能描述:IC AMP BTL AUDIO 45W 4CH HZIP25 |
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