ta8273h TOSHIBA Semiconductor CORPORATION, ta8273h Datasheet - Page 4

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ta8273h

Manufacturer Part Number
ta8273h
Description
Max Power 47 W Btl ? 4 Ch Audio Power Ic
Manufacturer
TOSHIBA Semiconductor CORPORATION
Datasheet

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<Recommended Application>
<Application for pulled up>
3. Muting Function
250 mA ability.
temperature).
less than 5 V.
to internal circuit of pin 22.
ON/OFF.
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 m-COM port which has I
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 microcontroller 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
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
2002-02-13
MUTE
TA8273H
MUTE
2.8 3
>
(V)

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