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参数资料
| 型号： | TB2921AHQ |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 29 W, 4 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
| 封装： | 1 MM PITCH, PLASTIC, HZIP-25 |
| 文件页数： | 14/17页 |
| 文件大小： | 264K |
| 代理商： | TB2921AHQ |
TB2921AHQ
2009-02-03
6
5. Pop Noise Suppression
Since the AC-GND pin (pin 16) is used as the input reference voltage pin for all amps, the ratio between
the input capacitance (C1) and the AC-to-GND capacitance (C6) should be 1:4.
Also, if the power is turned OFF before the C1 and C6 batteries have been completely charged, pop noise
will be generated because of the DC input unbalance.
To counteract 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 the C2 makes the muting
time (the time from when the power is turned ON to when audio output starts) is fix.
The pop noise which is generated when the muting function is turned ON/OFF will vary according to the
time constant of C4.The greater the capacitance, the lower the pop noise. Note that the time from when the
mute control signal is applied to C4 to when the muting function is turned ON/OFF will be longer.
6. External Component Constants
Effects
Component
Recommended
Value
Purpose
When lower than
recommended value
When higher than
recommended value
Notes
C1
0.22
μF
To eliminate DC
Cut-off frequency is
increased.
Cut-off frequency is reduced.
Pop noise is
generated
when VCC is
turned on.
C2
10
μF
To reduce ripple
Powering on/off is faster.
Powering on/off is slower.
C3
0.1
μF
To provide
sufficient
oscillation margin
Reduces noise and provides sufficient oscillation margin
C4
1
μF
To reduce pop
noise
High pop noise. Duration until
mute function is turned on/off
is short.
Low pop noise. Duration until
mute function is turned on/off
is long.
C5
3900
μF
Ripple filter
Power supply humming and ripple filtering.
C6
1
μF
Reference voltage
for all inputs
Pop noise is suppressed when C1: C6
= 1:4.
Pop noise is
generated
when VCC is
turned on.
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相关代理商/技术参数 |
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| TB2922HQ | 制造商:Toshiba 功能描述:Pure complementary P-ch & N-ch DMOS output stage, BTL output form |
| TB2922HQ(O) | 功能描述:音频放大器 2ch BTL Audio AMP P-ch N-ch DMOS Out-P 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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| TB2923HQ(O) | 功能描述:音频放大器 51W 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 |
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