tb2921ahq TOSHIBA Semiconductor CORPORATION, tb2921ahq Datasheet - Page 6

• Manufacturer Part Number: tb2921ahq
• Description: 51 W ? 4-ch Btl Audio Power Ic
• Manufacturer: TOSHIBA Semiconductor CORPORATION

5. Pop Noise Suppression
6. External Component Constants
Component
C1
C2
C3
C4
C5
C6
the input capacitance (C1) and the AC-to-GND capacitance (C6) should be 1:4.
will be generated because of the DC input unbalance.
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.
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.
Since the AC-GND pin (pin 16) is used as the input reference voltage pin for all amps, the ratio between
Also, if the power is turned OFF before the C1 and C6 batteries have been completely charged, pop noise
To counteract the noise, it is recommended that a longer charging time be used for C2 as well as for C1
The pop noise which is generated when the muting function is turned ON/OFF will vary according to the
Recommended
3900 μF
0.22 μF
0.1 μF
Value
10 μF
1 μF
1 μF
To eliminate DC
To reduce ripple
To provide
sufficient
oscillation margin
To reduce pop
noise
Ripple filter
Reference voltage
for all inputs
Purpose
Cut-off frequency is
increased.
Powering on/off is faster.
Reduces noise and provides sufficient oscillation margin
High pop noise. Duration until
mute function is turned on/off
is short.
Power supply humming and ripple filtering.
Pop noise is suppressed when C1: C6 = 1:4.
recommended value
When lower than
6
Effects
Cut-off frequency is reduced.
Powering on/off is slower.
Low pop noise. Duration until
mute function is turned on/off
is long.
recommended value
When higher than
TB2921AHQ
Pop noise is
generated
when V
turned on.
Pop noise is
generated
when V
turned on.
2009-02-03
Notes
CC
CC
is
is