TB2921HQ Toshiba, TB2921HQ Datasheet - Page 5

• Manufacturer Part Number: TB2921HQ
• Manufacturer: Toshiba

Specifications of TB2921HQ

• No. Of Channels: 4
• Package: HZIP 25-P-1.00F
• Recommended Vcc (v): 13.2
• Rl=2 Ohm: 80W x 4
• Rl=4 Ohm: 50W x 4
• Rl=8 Ohm: -
• Features/built-in Functions: 4 BTL channels, standby switch, mute, low-RON BiCD process, high-side switch
• Operating Voltage (v): 9 to 18

(+) Amp output
V
ref
It is possible to use this function by setting the voltage of Pin 22 higher than 8V.
In case of Appearing output offset voltage by Generating a Large Leakage Current on the input Capacitor etc.
4. Off-set detection function
Voltage of
5. Pop Noise Suppression
Voltage of
point (A)
point (B)
Elec. vol
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.
GND
GND
GND
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
Leak or short
V
ref/2
R
S1
Figure 6 Application and Detection Mechanism
V
bias
Figure 7 Wave Form
R
S2
+
−
25
5
A
V
5 V
L.P.F.
Offset voltage (at leak or short)
B
DC Voltage (+) Amp (at leak) (R
V
DC Voltage (−) Amp (at short) (R
CC/2
To CPU
t
t
t
(normal DC voltage)
Threshold level (R
V
Threshold level (R
CC/2
TB2921HQ
2006-05-25
S1
S2
)
)
S1
S2
)
)