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參數(shù)資料
| 型號(hào)： | TB2901H |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 55 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
| 封裝： | HZIP-25 |
| 文件頁(yè)數(shù)： | 12/17頁(yè) |
| 文件大小： | 332K |
| 代理商： | TB2901H |
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TB2901H
2002-11-06
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 mA. 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 kW 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
Mut
e
a
tte
nu
ati
o
n
A
T
(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 W
VOUT = 20dBm
22
1 k
W
R1
5 V
Mute ON/OFF
control
C4
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| TB2901HQ | 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 |
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| 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 |
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