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

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

V

R

1

R

2

(V

V

R

1

R

2

(V

R

1

R

2

+

V

V

R

1

R

2

+

V

V

+

1.27V

+

1.27V

+

2.8V

+

0.6V

+

−

2.54V

Reference

−

+

−

+

+

−

4

1

7

2

3

5

6

R1

R1

8

Output

Voltage

Pins 5, 6

GND

LED ‘ON’

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’

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

V

R

1

R

2

(V

V

R

1

R

2

(V

R

1

R

2

+

V

V

R

1

R

2

+

V

V

+

1.27V

+

1.27V

+

2.8V

+

0.6V

+

−

8

−

+

−

+

+

−

4

1

7

2

3

5

6

R1

R1

2.54V

Reference

Output

Voltage

Pins 5, 6

GND

LED ‘ON’

GND