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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： | 17/19页 |
| 文件大小： | 439K |
| 代理商： | TB2905HQ |
TB2905HQ
2006-04-28
7
6.
Pop Noise Suppression
The TB2905HQ uses AC-GND as a common NF pin for all amplifiers, thus requiring that the ratio of
input capacitance C1 to AC-GND capacitance C6 be 1:4.
Powering up the IC initiates the charging of C1 and C6. If the IC is turned off before the charging of C1
and C6 completes, the input DC balance becomes unbalanced, causing a pop noise to be produced.
To suppress the noise, it is recommended that a longer charging time be used for C2 as well as for C1 and
C6. Note that the time which audio output takes to start will be longer, since C2 determines the muting
time (the time from when the power is turned on to when audio output starts).
The pop noise which is generated when the muting function is turned on/off will vary according to the
time constant for C4.
The greater the capacitance, the lower the pop noise. Note that the time from when the muting control
signal is applied to C4 to when the muting function is turned on/off will be longer.
7.
External Component Constants
Effect
Component
Name
Recommended
Value
Purpose
Smaller than Recommended
Value
Larger than Recommended
Value
Remarks
C1
0.22
F
To eliminate DC
Cutoff frequency is increased
Cutoff frequency is reduced
Affects the pop
noise
generated
when VCC is
turned on
C2
10
F
To reduce ripple
Powering on/off is faster
Powering on/off is slower
C3
0.1
F
To provide
sufficient
oscillation margin
Reduces noise and provides sufficient oscillation margin
C4
1
F
To reduce pop
noise
High pop noise
Duration until muting function
is turned on/off is short
Low pop noise
Duration until muting function
is turned on/off is long
C5
3900
F
Ripple filter
Power supply humming and ripple filtering
C6
1
F
NF for all outputs
Pop noise is suppressed when C1:C6
= 1:4
Affects the pop
noise
generated
when VCC is
turned on
8.
Preventive measure against oscillation
For preventing the oscillation, check that the application circuit and actual load makes no abnormal oscillation
under all the necessary condition.
Especially, perform the temperature test to check the oscillation margin since the oscillation margin is varied
according to the causes described below,
1) Layout of printed board
2) Type of Speaker
3) Value and kind of the capacitor between the output(+) and output(-)
4) Value and kind of the CR filter or the capacitor between each output and GND.
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| 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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