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MC33161 数据表(PDF) 10 Page - ON Semiconductor

部件名 MC33161
功能描述  Universal Voltage Monitors
Download  16 Pages
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制造商  ONSEMI [ON Semiconductor]
网页  http://www.onsemi.com
标志 ONSEMI - ON Semiconductor

MC33161 数据表(HTML) 10 Page - ON Semiconductor

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MC34161, MC33161
http://onsemi.com
10
The above figure shows the MC34161 configured as a positive and negative overvoltage detector. As the input voltage increases from ground, the LED will turn
‘ON’ when either –VS1 exceeds V2, or VS2 exceeds V4. With the dashed line output connection, the circuit becomes a positive and negative undervoltage detector.
As the input voltage decreases from the peak towards ground, the LED will turn ‘ON’ when either VS2 falls below V3, or –VS1 falls below V1.
For known resistor values, the voltage trip points are:
For a specific trip voltage, the required resistor ratio is:
Figure 21. Positive and Negative Overvoltage Detector
V
1 +
R
3
R
4
(V
th1 * Vref) ) Vth1
V
2 +
R
3
R
4
(V
th1 * VH1 * Vref) ) Vth1 * VH1
V
3 + (Vth2 * VH2)
R
2
R
1
) 1
V
4 + Vth2
R
2
R
1
) 1
R
3
R
4
+
(V
1 * Vth1)
(V
th1 * Vref)
R
3
R
4
+
(V
2 * Vth1 ) VH1)
(V
th1 * VH1 * Vref)
R
2
R
1
+
V
4
V
th2
* 1
R
2
R
1
+
V
3
V
th2 * VH2
* 1
+
1.27V
+
1.27V
+
2.8V
+
0.6V
+
2.54V
Reference
+
+
+
4
1
7
2
3
5
6
R4
R3
–VS1
VS2
R1
R2
8
VCC
Output
Voltage
Pins 5, 6
Gnd
LED ‘ON’
VHys2
VHys1
VCC
Gnd
Input –VS1
V4
V3
V1
V2
Input VS2
The above figure shows the MC34161 configured as a positive and negative undervoltage detector. As the input voltage decreases toward ground, the LED will
turn ‘ON’ when either VS1 falls below V1, or –VS2 falls below V3. With the dashed line output connection, the circuit becomes a positive and negative overvoltage
detector. As the input voltage increases from the ground, the LED will turn ‘ON’ when either VS1 exceeds V2, or –VS1 exceeds V1.
For known resistor values, the voltage trip points are:
For a specific trip voltage, the required resistor ratio is:
Figure 22. Positive and Negative Undervoltage Detector
V
1 + (Vth1 * VH1)
R
4
R
3
) 1
V
2 + Vth1
R
4
R
3
) 1
V
3 +
R
1
R
2
(V
th * Vref) ) Vth2
V
4 +
R
1
R
2
(V
th * VH2 * Vref) ) Vth2 * VH2
R
4
R
3
+
V
2
V
th1
* 1
R
4
R
3
+
V
1
V
th1 * VH1
* 1
R
1
R
2
+
V
4 ) VH2 * Vth2
V
th2 * VH2 * Vref
R
1
R
2
+
V
3 * Vth2
V
th2 * Vref
+
1.27V
+
1.27V
+
2.8V
+
0.6V
+
+
+
+
4
1
7
2
3
5
6
2.54V
Reference
8
VCC
R3
VS1
R4
R1
R2
–VS2
V2
V1
V3
V4
Gnd
VCC
Gnd
Output
Voltage
Pins 5, 6
Input –VS2
Input VS1
LED ‘ON’
VHys2
VHys1


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