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參數(shù)資料
| 型號(hào)： | TA8273H |
| 廠商： | Toshiba Corporation |
| 英文描述： | RAC15-DA(-E)(-ST) Series - Powerline Regulated AC-DC Converters; Output Voltage (Vdc): 5V; Features: Compact AC-DC Power Supply; 15 Watt PCB Mount Package; Universal Input Voltage Range; 3000VAC Isolation; Low Output Ripple and Noise; Short Circuit Protected; UL Certified |
| 中文描述： | 東芝雙極線(xiàn)性集成電路硅單片 |
| 文件頁(yè)數(shù)： | 4/13頁(yè) |
| 文件大?。?/td> | 249K |
| 代理商： | TA8273H |
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TA8273H
2002-02-13
4
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 R
1
and C
4
and these parts is related the pop noise at power
ON/OFF.
The series resistance; R1 must be set up less than 10 k to get enough muting attenuation.
The muting function have to be controlled by a transistor, FET and -COM port which has I
MUTE
250 A 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.
V
CC
Small current capacity switch
BATTERY
Stand-By
V
CC
DIRECTLY FROM
MICROCOMPUTER
BATTERY
Stand-By
– Stand-by Switch Method –
Figure 3
– Conventional Method –
V
CC
Large current capacity switch
BATTERY
V
CC
FROM
MICROCOMPUTER
BATTERY
RELAY
Figure 5 Mute Attenuation V
MUTE
(V)
Point A voltage: VMUTE (V)
ATT – V
MUTE
M
10 k
5 k
VCC 13.2 V
Po 10 W
PL 4
f 1 kHz
BW 400~30 kHz
100
0
0.4
0.8 1 1.2
1.6
2
2.4
2.8 3
80
60
40
20
0
20
Figure 4 Muting Function
R
1
I (100 A)
I
MUTE (OFF)
22
I
MUTE
A
V
MUTE
C
4
<Recommended Application>
<Application for pulled up>
R
1
I (100 A)
I
MUTE (OFF)
22
I
MUTE
V
MUTE
C
4
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