MC33161 データシートの表示（PDF） - Motorola => Freescale
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MC33161 Datasheet PDF : 16 Pages
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MC34161 MC33161
V2
Input VS
V1
Gnd
Output VCC
Voltage
Pins 5, 6 Gnd
Figure 15. Dual Postive Overvoltage Detector
VCC
8
VHys
LED ‘ON’
2.54V
VS1
1
Reference
–
R2 7
++
+
2.8V
VS2
R1
2+ –
1.27V
–
6
R2
++
+
0.6V
3+ –
5
R1
1.27V
4
The above figure shows the MC34161 configured as a dual positive 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 positive undervoltage detector. As the input voltage decreases from the
peak towards ground, the LED will turn ‘ON’ when VS1 or VS2 falls below V1.
+ * ǒ ) Ǔ + ǒ ) Ǔ For known resistor values, the voltage trip points are:
V1
(Vth
VH)
R2
R1
1
V2
Vth
R2
R1
1
For a specific trip voltage, the required resistor ratio is:
+ * * R2
R1
V1
Vth VH
1
+ * R2
R1
V2
Vth
1
V2
Input VS
V1
Gnd
Output VCC
Voltage
Pins 5, 6 Gnd
Figure 16. Dual Postive Undervoltage Detector
VCC
8
VHys
LED ‘ON’
2.54V
VS1
1
Reference
–
7
R2
+
++
2.8V
6
VS2
2+ –
R1
1.27V
–
R2
++
+
0.6V
3+ –
5
R1
1.27V
4
The above figure shows the MC34161 configured as a dual positive 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 positive overvoltage detector. As the input voltage increases from
ground, the LED will turn ‘ON’ when VS1 or VS2 exceeds V2.
+ * ǒ ) Ǔ + ǒ ) Ǔ For known resistor values, the voltage trip points are:
V1
(Vth
VH)
R2
R1
1
V2
Vth
R2
R1
1
For a specific trip voltage, the required resistor ratio is:
+ * * R2
R1
V1
Vth VH
1
+ * R2
R1
V2
Vth
1
MOTOROLA ANALOG IC DEVICE DATA
7
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