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參數(shù)資料
| 型號： | TB2905HQ |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 55 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
| 封裝： | 1 MM PITCH, PLASTIC, HZIP-25 |
| 文件頁數(shù)： | 12/17頁 |
| 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
相關(guān)PDF資料 |
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 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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(chǎn)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 |
| TB2915HQ(O) | 功能描述:音頻放大器 45W x 4-CH high-EFF car power amp RoHS:否 制造商:STMicroelectronics 產(chǎn)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 |
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