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参数资料
| 型号： | TB2946HQ |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 26 W, 2 CHANNEL, AUDIO AMPLIFIER, PZFM25 |
| 封装： | 1 MM PITCH, PLASTIC, HZIP-25 |
| 文件页数： | 16/18页 |
| 文件大小： | 484K |
| 代理商： | TB2946HQ |
TB2946HQ
2009-01-29
7
5. Pop Noise Suppression
Since the TB2946HQ uses the AC-GND pin (pin 16) as the common input reference voltage pin for all
amplifiers, the ratio of the input capacitance (C1) to the AC-to-GND capacitance (C6) should be 1:4.
Also, if power is removed before C1 and C6 are completely charged, pop noise will be generated because of
unbalanced DC currents.
To avoid this problem, it is recommended to use a larger capacitor as C2 to increase the charging times of C1
and C6. Note, however, that C2 also affects the time required from power-on to audio output.
The pop noise generated by the muting and unmuting of the audio output varies with the time constant of
C4. A larger capacitance reduces the pop noise, but increases the time from when the mute control signal is
applied to C4 to when the mute function is enabled.
Caution for use : We propose that C2 value are adjustable from 10
μF to 47μF at the turn-on timing.
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
Common
reference voltage
for all input
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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