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参数资料
| 型号： | TB2905HQ |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 55 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
| 封装： | 1 MM PITCH, PLASTIC, HZIP-25 |
| 文件页数： | 12/17页 |
| 文件大小： | 278K |
| 代理商： | TB2905HQ |
TB2905HQ
2005-08-17
4
3.
Muting Function (Pin 22)
Driving pin 22 low triggers audio muting.
The time constant for muting is determined from R1 and C4. Select the constants considering the pop noise
that is produced when powering the TB2905HQ on/off or turning muting on/off. (See Figures 4 and 5.)
Pin 22 is designed to be controlled at 3.3 V.
The pin functions as a current source switch for the internal muting circuit and is designed so that its
discharging current is 200
A. The value of the external pull-up resistor is based on this current.
Example: When changing the control voltage from 3.3 V to 5 V, 5 V/3.3 V x 47 k
= 71 k
The TB2905HQ internally triggers muting when the voltage is dropped, taking in a current of 200 A. It
cannot take in the current if the pull-up resistance is too low. The series resistance (R1) for pin 22 must,
therefore, be at least 47 k
.
- Conventional method -
VCC
Large-current capacity switch
Battery
VCC
From microcontroller
Battery
Relay
VCC
Small-current capacity switch
Battery
Stand-By
VCC
From microcontroller
Battery
Stand-By
- Standby switching -
Figure 3
Standby switching
Muting pin voltage: VMUTE (V)
ATT – VMUTE
Muting
attenua
tion
A
T
(dB)
Figure 5
Muting attenuation
VMUTE (V)
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
Figure 4
Muting function
22
1 k
R1
3.3u
Muting
ON/OFF control
C4
相关PDF资料 |
PDF描述 |
|---|---|
| TB2905HQ | 55 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
| TB2906HQ | 26 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
| TB2906HQ | 26 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
| TB2912HQ | 27 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
| TB2913HQ | 29 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| TB2915AHQ(O) | 制造商:Toshiba America Electronic Components 功能描述:IC AMP BTL AUDIO 45W 4CH HZIP25 |
| TB2915HQ(O) | 功能描述:音频放大器 45W x 4-CH high-EFF car power 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 |
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