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MC34161D Datasheet(PDF) 10 Page - ON Semiconductor

Part # MC34161D
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

MC34161D Datasheet(HTML) 10 Page - ON Semiconductor

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MC34161, MC33161, NCV33161
http://onsemi.com
10
The above figure shows the MC34161 configured as a positive voltage window detector. This is accomplished by connecting channel 1 as an undervoltage detector,
and channel 2 as an overvoltage detector. When the input voltage VS falls out of the window established by V1 and V4, the LED will turn ‘ON’. As the input voltage
falls within the window, VS increasing from ground and exceeding V2, or VS decreasing from the peak towards ground and falling below V3, the LED will turn ‘OFF’.
With the dashed line output connection, the LED will turn ‘ON’ when the input voltage VS is within the window.
For known resistor values, the voltage trip points are:
For a specific trip voltage, the required resistor ratio is:
Figure 20. Positive Voltage Window Detector
V1 + (Vth1 * VH1)
R3
R1 ) R2
) 1
V3 + (Vth2 * VH2)
R2 ) R3
R1
) 1
V2 + Vth1
R3
R1 ) R2
) 1
V4 + Vth2
R2 ) R3
R1
) 1
R2
R1
+
V3(Vth2 * VH2)
V1(Vth1 * VH1)
* 1
R3
R1
+
V3(V1 * Vth1 ) VH1)
V1(Vth2 * VH2)
R2
R1
+
V4 xVth1
V2 xVth2
* 1
R3
R1
+
V4(V2 * Vth1)
V2 xVth2
+
1.27V
+
1.27V
+
2.8V
+
0.6V
+
-
2.54V
Reference
-
+
-
+
+
-
4
1
7
2
3
5
6
VS
R3
R1
R2
8
VCC
Output
Voltage
Pins 5, 6
GND
CH2
CH1
LED `ON'
VHys2
VHys1
LED `ON'
`OFF'
LED `OFF'
`ON'
V4
V3
V2
V1
VCC
GND
Input VS
The above figure shows the MC34161 configured as a negative voltage window detector. When the input voltage −VS falls out of the window established by V1
and V4, the LED will turn ‘ON’. As the input voltage falls within the window, −VS increasing from ground and exceeding V2, or −VS decreasing from the peak towards
ground and falling below V3, the LED will turn ‘OFF’. With the dashed line output connection, the LED will turn ‘ON’ when the input voltage −VS is within the window.
For known resistor values, the voltage trip points are:
For a specific trip voltage, the required resistor ratio is:
Figure 21. Negative Voltage Window Detector
V1 +
R1(Vth2 * Vref)
R2 ) R3
) Vth2
V2 +
R1(Vth2 * VH2 * Vref)
R2 ) R3
) Vth2 * VH2
V3 +
(R1 ) R2)(Vth1 * Vref)
R3
) Vth1
V4 +
(R1 ) R2)(Vth1 * VH1 * Vref)
R3
) Vth1 * VH1
R1
R2 ) R3
+
V1 * Vth2
Vth2 * Vref
R1
R2 ) R3
+
V2 * Vth2 ) VH2
Vth2 * VH2 * Vref
R3
R1 ) R2
+
Vth1 * Vref
V3 * Vth1
R3
R1 ) R2
+
Vth1 * VH1 * Vref
V4 ) VH1 * Vth1
+
1.27V
+
1.27V
+
2.8V
+
0.6V
+
-
-
+
-
+
+
-
4
1
7
2
3
5
6
2.54V
Reference
R3
R1
R2
-VS
8
VCC
Output
Voltage
Pins 5, 6
GND
CH2
CH1
V1
V2
V3
V4
VCC
GND
Input -VS
LED `ON'
LED `ON'
`OFF'
LED `OFF'
`ON'
VHys1
VHys2


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