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NCV33161 Datasheet(PDF) 9 Page - ON Semiconductor

Part # NCV33161
Description  Universal Voltage Monitors
Download  18 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCV33161 Datasheet(HTML) 9 Page - ON Semiconductor

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MC34161, MC33161, NCV33161
http://onsemi.com
9
The above figure shows the MC34161 configured as a dual negative overvoltage detector. As the input voltage increases from ground, the LED will turn ‘ON’ when
−VS1 or −VS2 exceeds V2. With the dashed line output connection, the circuit becomes a dual negative undervoltage detector. As the input voltage decreases from
the peak towards ground, the LED will turn ‘ON’ when −VS1 or −VS2 falls below V1.
For known resistor values, the voltage trip points are:
For a specific trip voltage, the required resistor ratio is:
Figure 18. Dual Negative Overvoltage Detector
V1 +
R1
R2
(Vth * Vref) ) Vth
V2 +
R1
R2
(Vth * VH * Vref) ) Vth * VH
R1
R2
+
V1 * Vth
Vth * Vref
R1
R2
+
V2 * Vth ) VH
Vth * VH * Vref
+
1.27V
+
1.27V
+
2.8V
+
0.6V
+
-
2.54V
Reference
-
+
-
+
+
-
4
1
7
2
3
5
6
R1
-VS1
R1
-VS2
R2
R2
8
VCC
Input -VS
Output
Voltage
Pins 5, 6
GND
V1
V2
VCC
LED `ON'
VHys
GND
The above figure shows the MC34161 configured as a dual negative undervoltage detector. As the input voltage decreases towards ground, the LED will turn ‘ON’
when −VS1 or −VS2 falls below V1. With the dashed line output connection, the circuit becomes a dual negative overvoltage detector. As the input voltage increases
from ground, the LED will turn ‘ON’ when −VS1 or −VS2 exceeds V2.
For known resistor values, the voltage trip points are:
For a specific trip voltage, the required resistor ratio is:
Figure 19. Dual Negative Undervoltage Detector
V1 +
R1
R2
(Vth * Vref) ) Vth
V2 +
R1
R2
(Vth * VH * Vref) ) Vth * VH
R1
R2
+
V1 * Vth
Vth * Vref
R1
R2
+
V2 * Vth ) VH
Vth * VH * Vref
+
1.27V
+
1.27V
+
2.8V
+
0.6V
+
-
8
-
+
-
+
+
-
4
1
7
2
3
5
6
R1
-VS1
R1
-VS2
2.54V
Reference
R2
R2
VCC
VHys
Input -VS
Output
Voltage
Pins 5, 6
GND
V1
V2
VCC
LED `ON'
GND


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