TA8275HQ TOSHIBA Semiconductor CORPORATION, TA8275HQ Datasheet - Page 4

• Manufacturer Part Number: TA8275HQ
• Description: Max Power 41 W Btl ? 4 Ch Audio Power Ic
• Manufacturer: TOSHIBA Semiconductor CORPORATION

<Recommended Application>
<Application for pulled up>
3. Muting Function
By means of controlling pin 22 less than 0.5 V, it can make the audio muting condition.
The muting time constant is decided by R
ON/OFF.
The series resistance; R1 must be set up less than 10 kΩ to get enough muting attenuation.
The muting function have to be controlled by a transistor, FET and µ-COM port which has I
ability.
Pin 22 terminal voltage has the temperature characteristics of 4.6 V (low temperature) to 3.2 V (high
temperature).
Therefore, it is need to design with attention as using the microcontroller of which operating voltage is less
than 5 V.
Terminal 22 may not be pulled up and shall be controlled by OPEN/LOW.
When it is obliged to do, it must be pulled up via diode, because it has to defend flowing reverse current to
internal circuit of pin 22.
I
I
MUTE (OFF)
MUTE (OFF)
I (100 µA)
I (100 µA)
Figure 4 Muting Function
22
22
Stand-By
(pin 22)
V
CC
I
I
MUTE
MUTE
R
R
1
1
Small current capacity switch
Large current capacity switch
V
V
MUTE
V
CC
MUTE
A
BATTERY
– Stand-by Switch Method –
BATTERY
– Conventional Method –
Figure 3
1
and C
4
Figure 5 Mute Attenuation − V
4
and these parts is related the pop noise at power
−100
DIRECTLY FROM
MICROCOMPUTER
−20
−40
−60
−80
20
0
0
V
Stand-By
CC
0.4
Point A voltage: V MUTE (V)
0.8 1 1.2
V
RELAY
CC
ATT – V
1.6
MUTE
10 kΩ
FROM
MICROCOMPUTER
BATTERY
BATTERY
V CC = 13.2 V
P o = 10 W
PL = 4 Ω
f = 1 kHz
BW = 400~30 kHz
2
2.4
5 kΩ
TA8275HQ
MUTE
MUTE
2006-04-28
2.8 3
> 250 µA
(V)