tb2901h TOSHIBA Semiconductor CORPORATION, tb2901h Datasheet - Page 5

• Manufacturer Part Number: tb2901h
• Description: Maximum Power 47 W Btl 4-ch Audio Power Ic
• Manufacturer: TOSHIBA Semiconductor CORPORATION

4. High-Side Switch
5. Pop Noise Suppression
6. External Component Constants
Note:
Component
Name
C1
C2
C3
C4
C5
C6
will be generated because of the DC input umbalance.
pin. Thus, both the power amp IC and the connected external unit (the hideaway unit) can be turned
ON/OFF by using of the standby switch.
capacitance (C1) and the AC-to-GND capacitance (C6) should be 1:4.
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.
signal is applied to C4 to when the muting function is turned ON/OFF will be longer.
Pin 25 of this device is used in concerned with V
Since the AC-GND pin (pin 16) is used as the NF pin for all amps, the ratio between the input
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
The greater the capacitance, the lower the pop noise. Note that the time from when the mute control
If recommended value is not used.
Recommended
3900 mF
0.22 mF
0.1 mF
Value
10 mF
1 mF
1 mF
To eliminate DC
To reduce ripple
To provide
sufficient
oscillation margin
To reduce pop
noise
Ripple filter
NF for all outputs
Purpose
Cut-off frequency is
increased
Powering ON/OFF is faster
Reduces noise and provides sufficient oscillation margin
High pop noise. Duration until
muting function is turned
ON/OFF is short
Power supply ripple filtering
Pop noise is suppressed when C1:C6 = 1:4
Lower than recommended
5
value
CC
as a high-side switch which operates with the standby
Effect
Cut-off frequency is reduced
Powering ON/OFF takes
longer
Low pop noise. Duration until
muting function is turned
ON/OFF is long
Higher than recommended
value
Pop noise is
generated when
V
Pop noise is
generated when
V
2002-11-06
CC
CC
TB2901H
is ON
is ON
Notes