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MC34161DG bảng dữ liệu(PDF) 11 Page - ON Semiconductor

tên linh kiện MC34161DG
Giải thích chi tiết về linh kiện  Universal Voltage Monitors
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MC34161, MC33161, NCV33161
http://onsemi.com
11
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 22. Positive and Negative Overvoltage Detector
V1 +
R3
R4
(Vth1 * Vref) ) Vth1
V2 +
R3
R4
(Vth1 * VH1 * Vref) ) Vth1 * VH1
V3 + (Vth2 * VH2)
R2
R1
) 1
V4 + Vth2
R2
R1
) 1
R3
R4
+
(V1 * Vth1)
(Vth1 * Vref)
R3
R4
+
(V2 * Vth1 ) VH1)
(Vth1 * VH1 * Vref)
R2
R1
+
V4
Vth2
* 1
R2
R1
+
V3
Vth2 * 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 23. Positive and Negative Undervoltage Detector
V1 + (Vth1 * VH1)
R4
R3
) 1
V2 + Vth1
R4
R3
) 1
V3 +
R1
R2
(Vth * Vref) ) Vth2
V4 +
R1
R2
(Vth * VH2 * Vref) ) Vth2 * VH2
R4
R3
+
V2
Vth1
* 1
R4
R3
+
V1
Vth1 * VH1
* 1
R1
R2
+
V4 ) VH2 * Vth2
Vth2 * VH2 * Vref
R1
R2
+
V3 * Vth2
Vth2 * 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


Số phần tương tự - MC34161DG

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