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| 型号： | TB2912HQ |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 27 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
| 封装： | 1 MM PITCH, PLASTIC, HZIP-25 |
| 文件页数： | 23/40页 |
| 文件大小： | 580K |
| 代理商： | TB2912HQ |
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TB2912HQ
2006-04-28
3
Caution and Application Information (description is made referring only on the single
channel.)
1.
Voltage Gain Adjustment
This IC has no NF (negative feedback) Pins. Therefore, the voltage gain can not be adjusted (except by
software). However, this feature makes possible space and cost saving.
The amplifier gain, GV = 26dB, is calculated using the expression below:
The voltage gain of amp.1: GV1 = 0dB
The voltage gain of amp.2A, B: GV2 = 20dB
The voltage gain of BTL connection: GV (BTL) = 6dB
Therefore, the total voltage gain is decided by expression below.
GV = GV1 + GV2 + GV (BTL) = 0 + 20 + 6 = 26dB
In the case when GV = 12dB selected via I2C, GV1 changed from 0dB to 14dB so that the output
dynamic range is reduced as the output of Amp.1 is attenuated.
2.
Stand by and muting (pin 16)
The below procedure can make the pop noise suppress.
At turning on(Stand by off)
①
I2C bus circuit awake as the pin 16 is 2.5V and more.
The voltage of pin 16 is pulled up to Vcc after this.
Therefore, the diode insertion is necessary between pin 16
and micro controller to stop the reverse current if the
micro controller control the pin 16 of this IC.
②
Control the mute / standby function via I2C as I2C
command can be received after ① condition.
To turning off (Standby on)
①
Control muting circuit to mute ON via I2C control or the pin 16 is set at M position
②
Control the standby circuit to turn off via I2C bus and it become in standby mode after 53200 x C2(sec)
later from sending the standby ON command.
③
The pop noise generates if the pin 16 is set at L position in advance to the ②step, or from the ① step
to the ③ step directly.
The capacitor C4 at pin 16 is for muting time constant to suppress the pop noise. The larger value capacitor
is used, the lower pop noise becomes but the longer the muting time from the mute ON command sent to
muting an output sound actually.
The charge period, which makes the delay of muting after "Mute On" command is written, is MIN=30msec,
MAX=180msec in case of C4 (Pin 16) = 1 uF, Vcc=9 to 18V and Tj =-40 to 150 degrees condition..
As the VCC is rapidly falling, the IC internal low voltage muting operates to eliminate the large pop noise
basically.
Use the transistor which has the current capacitance more than 1mA to control the pin 16 in stable.
Amp. 1
Input
Amp. 2A
Amp. 2B
Figure 1
Block Diagram
Figure 2
Stand by and Mute
To mute circuit
From low voltage
muting circuit
16
C4
1
F
Start Up
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| TB2921HQ(O) | 功能描述:音频放大器 50W x 4-CH class-AB 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 |
| TB2922HQ | 制造商:Toshiba 功能描述:Pure complementary P-ch & N-ch DMOS output stage, BTL output form |
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