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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： | 11/17页 |
| 文件大小： | 278K |
| 代理商： | TB2905HQ |
TB2905HQ
2005-08-17
3
Operational Description (Each description applies to a single channel)
1.
Voltage Gain
The TB2905HQ has no NF (negative feedback) pins. Therefore, the voltage gain (GV) is determined
within the IC.
Voltage gain of amplifier 1: GV1 = 0 dB
Voltage gain of amplifiers 2A and 2B: GV2 = 20 dB
Voltage gain obtained by BTL connection: GV (BTL) = 6 dB
Therefore, the total voltage gain is determined by the following expression:
GV = GV1 + GV2 + GV (BTL) = 0 + 20 + 6 = 26dB
Although this configuration without an NF pin does not allow the user to adjust voltage gain, it
eliminates the need for an NF capacitor, resulting in lower total application cost and smaller mounting
space.
2.
Standby Switching Function (Pin 4)
The TB2905HQ can be powered up or
down by controlling the state of pin 4
(standby pin).
The threshold voltage for pin 4 is
approximately 3 VBE (typ.). The supply
current in standby state is approximately 2
A (typ.).
Pin 4 control voltage: VSB
Stand-by
Power
VSB (V)
ON
OFF
0~0.5
OFF
ON
2.5~6 V
When changing the time constant for pin 4, check the pop noise produced.
< Advantages of standby switching >
(1)
The microcontroller can directly turn VCC on or off without using a switching relay.
(2)
Since the control current is microscopic, a switching relay with small current capacity is satisfactory
for switching.
Figure 2
Driving pin 4 high powers up
the TB2905HQ
ON
4
OFF
10 k
To bias
cutoff circuit
≈ 2 VBE
VCC
Power
Amplifier 1
Input
Amplifier 2A
Amplifier 2B
Figure 1
Amplifier Configuration
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 |
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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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