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參數(shù)資料
| 型號(hào)： | MC33161PG |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類(lèi)： | 電源管理 |
| 英文描述： | Universal Voltage Monitors |
| 中文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDIP8 |
| 封裝： | LEAD FREE, PLASTIC, DIP-8 |
| 文件頁(yè)數(shù)： | 12/18頁(yè) |
| 文件大?。?/td> | 225K |
| 代理商： | MC33161PG |
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MC34161, MC33161, NCV33161
http://onsemi.com
12
The above figure shows the MC34161 configured as an overvoltage detector with an audio alarm. Channel 1 monitors input voltage V
while channel 2 is connected
as a simple RC oscillator. As the input voltage increases from ground, the output of channel 1 allows the oscillator to turn ‘ON’ when V
S
exceeds V
2
.
For known resistor values, the voltage trip points are:
For a specific trip voltage, the required resistor ratio is:
Figure 24. Overvoltage Detector with Audio Alarm
V
1
(V
th
V
H
)
R
2
R
1
1
V
2
V
th
R
2
R
1
1
R
2
R
1
V
1
V
th
V
H
1
R
2
R
1
V
2
V
th
1
+
1.27V
+
1.27V
+
2.8V
+
0.6V
+
2.54V
Reference
+
+
+
4
1
7
2
3
5
6
8
V
CC
R
A
V
S
R
1
R
2
R
B
C
T
V
2
V
1
Input V
S
Output
Voltage
Pins 5, 6
GND
V
CC
GND
Osc ‘ON’
V
Hys
Piezo
The above figure shows the MC34161 configured as a microprocessor reset with a time delay. Channel 2 monitors input voltage V
while channel 1 performs the
time delay function. As the input voltage decreases towards ground, the output of channel 2 quickly discharges C
DLY
when V
S
falls below V
1
. As the input voltage
increases from ground, the output of channel 2 allows R
DLY
to charge C
DLY
when V
S
exceeds V
2
.
For known resistor values, the voltage trip points are:
For a specific trip voltage, the required resistor ratio is:
Figure 25. Microprocessor Reset with Time Delay
V
1
(V
th
V
H
)
R
2
R
1
1
V
2
V
th
R
2
R
1
1
For known R
DLY
C
DLY
values, the reset time delay is:
R
2
R
1
V
1
V
th
V
H
1
R
2
R
1
V
2
V
th
1
+
1.27V
+
1.27V
+
2.8V
+
0.6V
+
+
+
+
4
1
7
2
3
5
6
2.54V
Reference
8
V
CC
R
3
R
DLY
V
S
R
1
R
2
C
DLY
Input V
S
Output
Voltage
Pin 6
V
2
V
1
GND
V
CC
GND
V
CC
GND
V
Hys
t
DLY
Reset LED ‘ON’
Output
Voltage
Pin 5
1
1
V
th
V
CC
t
DLY
= R
DLY
C
DLY
In
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