TA8270HQ TOSHIBA Semiconductor CORPORATION, TA8270HQ Datasheet - Page 4

• Manufacturer Part Number: TA8270HQ
• Description: Max Power 43 W Btl ? 4 Ch High Efficiency Audio Power Ic
• Manufacturer: TOSHIBA Semiconductor CORPORATION

<Recommended Application>
<Application for pulled up>
3. Muting Function
ON/OFF.
µA ability.
temperature).
less than 5 V.
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
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
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 µA)
I (100 µA)
Figure 4 Muting Function
22
22
Stand-By
(pin 22)
V
CC
I
I
MUTE
MUTE
R
R
Small current capacity switch
1
1
Large current capacity switch
V
V
MUTE
CC
V
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
DIRECTLY FROM
MICROCOMPUTER
−100
−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
FROM
MICROCOMPUTER
10 kΩ
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
TA8270HQ
MUTE
2006-04-28
MUTE
2.8 3
(V)
> 250