TA8275 データシートの表示（PDF） - Toshiba
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TA8275 Datasheet PDF : 13 Pages
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TA8275H
Large current capacity switch
BATTERY
VCC
VCC
– Conventional Method –
RELAY
BATTERY
FROM
MICROCOMPUTER
Small current capacity switch
BATTERY
DIRECTLY FROM
MICROCOMPUTER
Stand-By VCC
Stand-By VCC
– Stand-by Switch Method –
BATTERY
Figure 3
3. Muting Function (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 R1 and C4 and these parts is related the pop noise at power
ON/OFF.
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 IMUTE > 250 mA
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.
<Recommended Application>
I (100 mA)
IMUTE (OFF) 22
R1
A
IMUTE
VMUTE
ATT – VMUTE
20
10 kW
5 kW
0
-20
-40
<Application for pulled up>
I (100 mA)
IMUTE (OFF) 22
R1
IMUTE
VMUTE
-60
-80
-100
0
VCC = 13.2 V
Po = 10 W
PL = 4 W
f = 1 kHz
BW = 400~30 kHz
0.4 0.8 1 1.2 1.6
2
2.4 2.8 3
Point A voltage: VMUTE (V)
Figure 4 Muting Function
Figure 5 Mute Attenuation - VMUTE (V)
4
2002-02-13
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