LM311N datasheet(6/10 Pages) ONSEMI

Part #	LM311N

Description	Single Comparators

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Manufacturer	ONSEMI [ON Semiconductor]

Direct Link	http://www.onsemi.com

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6 / 10 page

LM211, LM311

http://onsemi.com

6

8

Figure 15. Power Supply Current

versus Temperature

APPLICATIONS INFORMATION

Figure 16. Improved Method of Adding

Hysteresis Without Applying Positive

Feedback to the Inputs

Figure 17. Conventional Technique

for Adding Hysteresis

TA, TEMPERATURE (°C)

2.2

1.8

1.4

1.0

−55

−25

0

25

50

75

100

125

Positive and Negative Supply − Output High

Postive Supply − Output Low

+15 V

82

3.0 k

33 k

5.0 k

C1

0.002

mF

6

2

R1

R2

C2

Input

34

1

7

−15 V

5

4.7 k

LM311

0.1

mF

Output

+

−

0.1

mF

+15 V

3.0 k

5.0 k

C1

6

3

R1

R2

C2

Input

24

1

7

−15 V

5

4.7 k

LM311

0.1

mF

Output

+

−

0.1

mF

510 k

1.0 M

100

3.0

2.6

VCC = +15 V

VEE = −15 V

Figure 18. Zero−Crossing Detector

Driving CMOS Logic

Figure 19. Relay Driver with Strobe Capability

VCC = +15 V

3.0 k

10 k

VCC

5.0 k

LM311

Inputs

VEE

VEE = −15 V

Output

to CMOS Logic

Balance

Adjust

Balance

Input

GND

*D1

VCC2

VCC1

VEE

VCC

Output

Inputs

LM311

GND

1.0k

Q1

Balance/Strobe

2N2222 or

Equivalent

*Zener Diode D1

protects the comparator

from inductive kickback

and voltage transients

on the VCC2 supply line.

TTL

Strobe

+

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