MC33161 Просмотр технического описания (PDF) - Motorola => Freescale
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MC33161 Datasheet PDF : 16 Pages
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MC34161 MC33161
Gnd
V1
Input –VS
V2
Output VCC
Voltage
Pins 5, 6 Gnd
Figure 17. Dual Negative Overvoltage Detector
VCC
8
VHys
LED ‘ON’
2.54V
R2
1
Reference
–
R1
–VS1
7
+
2+ –
++
2.8V
6
R2
R1
1.27V
–
++
–VS2
+
0.6V
3+ –
5
1.27V
4
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:
+ * ) V1
R1
R2
(Vth
Vref)
Vth
+ * * ) * V2
R1
R2
(Vth
VH
Vref)
Vth
VH
For a specific trip voltage, the required resistor ratio is:
* R1 V1 Vth
+ * R2 Vth Vref
* ) R1 V2 Vth VH
+ * * R2 Vth VH Vref
Gnd
V1
Input –VS
V2
Output VCC
Voltage
Pins 5, 6 Gnd
Figure 18. Dual Negative Undervoltage Detector
VCC
8
VHys
LED ‘ON’
2.54V
R2
1
Reference
–
R1
–VS1
7
+
2+ –
++
2.8V
6
R2
R1
1.27V
–
++
–VS2
+
0.6V
3+ –
5
1.27V
4
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:
+ * ) V1
R1
R2
(Vth
Vref)
Vth
+ * * ) * V2
R1
R2
(Vth
VH
Vref)
Vth
VH
For a specific trip voltage, the required resistor ratio is:
* R1 V1 Vth
+ * R2 Vth Vref
* ) R1 V2 Vth VH
+ * * R2 Vth VH Vref
8
MOTOROLA ANALOG IC DEVICE DATA
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