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参数资料
| 型号： | TB2903HQ |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 29 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
| 封装： | 1 MM PITCH, PLASTIC, HZIP-25 |
| 文件页数： | 10/15页 |
| 文件大小： | 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
相关PDF资料 |
PDF描述 |
|---|---|
| TB2903HQ | 29 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
| TB2904HQ | 26 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
| TB2904HQ | 26 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
| TB2905HQ | 55 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
| TB2905HQ | 55 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TB2904HQ | 制造商:TOSHIBA 制造商全称:Toshiba Semiconductor 功能描述:Maximum Power 43 W BTL ?4-ch Audio Power IC |
| TB2905HQ | 制造商:TOSHIBA 制造商全称: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:音频放大器 25W x 4ch Class-KB Car Pwr Amp RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TB2906HQ | 制造商:TOSHIBA 制造商全称:Toshiba Semiconductor 功能描述:Maximum Power 43 W BTL x 4-ch Audio Power IC |
| TB2913HQ | 制造商:TOSHIBA 制造商全称:Toshiba Semiconductor 功能描述:Maximum Power 47 W BTL 】 4-ch Audio Power IC |
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