ta8275h TOSHIBA Semiconductor CORPORATION, ta8275h Datasheet - Page 4

• Manufacturer Part Number: ta8275h
• Description: Max Power 41 W Btl X 4 Ch Audio Power Ic
• Manufacturer: TOSHIBA Semiconductor CORPORATION

<Recommended Application>
<Application for pulled up>
3. Muting Function
The muting function have to be controlled by a transistor, FET and m-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
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.
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 kW to get enough muting attenuation.
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.
I
I
MUTE (OFF)
MUTE (OFF)
I (100 mA)
I (100 mA)
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 kW
FROM
MICROCOMPUTER
BATTERY
BATTERY
V CC = 13.2 V
P o = 10 W
PL = 4 W
f = 1 kHz
BW = 400~30 kHz
2
2.4
5 kW
MUTE
MUTE
2002-02-13
TA8275H
2.8 3
> 250 mA
(V)