TB2922HQ Toshiba, TB2922HQ Datasheet - Page 4

• Manufacturer Part Number: TB2922HQ
• Manufacturer: Toshiba

Specifications of TB2922HQ

• No. Of Channels: 2
• Package: HZIP12-P-1.78B
• Recommended Vcc (v): 18
• Rl=2 Ohm: -
• Rl=4 Ohm: -
• Rl=8 Ohm: 72W x 2
• Features/built-in Functions: 2 BTL channels, muting function, thermal shutdown, output short protection, BiCD MOS process
• Operating Voltage (v): 9 to 26 (8ohm) / 9 to 18 (4ohm)

3. Muting Function
Audio muting function is enabled when pin 6 is Low. When the time constant of the muting function is
determined by R
the power or muting function is turned ON/OFF, will vary according to the time constant. (Refer to
Figure4)
The pin 6 is designed to operate off 5 V so that the outside pull-up resistor R
this value:
ex) When control voltage is changed in to 6 V from 5 V.
large pop noise basically.
voltage muting does not become enough if the R
47 kΩ or more.
The low voltage muting circuit pull 200 µA current into the IC so that the effect of the internal low
Additionally, as the V
To obtain enough operation of the internal low voltage muting, a series resistor, R
6 V/5 V × 47 k = 56 k
1
and C
Stand-By
(pin 6)
V
4
CC
CC
Figure 4 Muting Function
,
it should take into account the pop noise. The pop noise, which is generated when
5 V
is rapidly falling, the IC internal low voltage muting operates to eliminate the
R
Small current capacity switch
Large current capacity switch
1
V
CC
C
Battery
4
6
– Standby Switch Method –
Battery
– Conventional Method –
Figure 3
1 kΩ
1
4
is too small value.
Mute ON/OFF
control
From microcomputer
V
Stand-By
CC
V
Relay
CC
1
is determined on the basic of
From
microcomputer
Battery
Battery
1
at pin 6 should be
TB2922HQ
2005-12-20