TB2926HQ Toshiba, TB2926HQ Datasheet - Page 8

• Manufacturer Part Number: TB2926HQ
• Manufacturer: Toshiba

Specifications of TB2926HQ

• No. Of Channels: 4
• Package: HZIP 25-P-1.00F
• Recommended Vcc (v): 13.2
• Rl=2 Ohm: Not Supported
• Rl=4 Ohm: 43W x 4
• Rl=8 Ohm: -
• Features/built-in Functions: 4 BTL channels, standby switch, mute, low-RON BiCD process, DC offset detection
• Operating Voltage (v): 9 to 18

6. Pop Noise Suppression
7. External Component Constants
Component
C1
C2
C3
C4
C5
C6
Since the TB2926HQ 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.
Recommended
3900 µ F
0.22 µ F
0.1 µ F
47 µ F
Value
1 µ F
1 µ F
To provide
sufficient
oscillation margin
To reduce pop
noise
Common
reference voltage
for all input
To eliminate DC
To reduce ripple
Ripple filter
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
8
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
TB2926HQ
Pop noise is
generated
when V
turned on.
Pop noise is
generated
when V
turned on.
2006-11-27
Notes
CC
CC
is
is