ta8266h TOSHIBA Semiconductor CORPORATION, ta8266h Datasheet - Page 4

• Manufacturer Part Number: ta8266h
• Description: Max Power 35 W Btl ?4 Ch Audio Power Ic
• Manufacturer: TOSHIBA Semiconductor CORPORATION

<Recommended Application>
<Application for pulled up>
3. Muting Function
ON/OFF.
I
temperature).
less than 5 V.
to internal circuit of pin 22.
MUTE
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
The series resistance; R1 must be set up less than 10 kW to get enough muting attenuation.
The muting function have to be controlled by a transistor, FET and micro-controller port which has
Pin 22 terminal voltage has the temperature characteristics of 4.6 V (low temperature) to 3.2 V (high
Therefore, it is need to design with attention as using the micro-controller of which operating voltage is
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
I
I
MUTE (OFF)
MUTE (OFF)
I (100 mA)
I (100 mA)
Figure 4 Muting Function
> 250 mA ability.
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 –
1
Figure 3
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
2
V CC = 13.2 V
P o = 10 W
PL = 4 W
f = 1 kHz
2.4
5 kW
MUTE
2002-02-13
TA8266H
2.8 3
(V)