LM211, LM311
3.0
2.6
2.2
1.8
1.4
1.0
−55
Positive and Negative Supply − Output High
V
CC
= +15 V
V
EE
= −15 V
Postive Supply − Output Low
SUPPLY CURRENT (mA)
−25
0
25
50
75
100
125
T
A
, TEMPERATURE (°C)
Figure 15. Power Supply Current
versus Temperature
APPLICATIONS INFORMATION
+15 V
3.0 k
33 k
0.1
mF
8
2
Input
R1
C2
R2
3
+
5.0 k
C1
0.002
6
mF
5
1
4
0.1
mF
−15 V
7
4.7 k
Input
Output
100
R1
C2
100
R2
2
1.0 M
−15 V 510 k
3
+
LM311
−
4
0.1
mF
1
5
7
Output
0.1
mF
8
5.0 k
C1
82
3.0 k
4.7 k
+15 V
6
LM311
−
Figure 16. Improved Method of Adding
Hysteresis Without Applying Positive
Feedback to the Inputs
Figure 17. Conventional Technique
for Adding Hysteresis
V
EE
V
CC
= +15 V
Balance
Adjust
Balance
Input
Inputs
3.0 k
Inputs
5.0 k
+
LM311
V
EE
V
EE
= −15 V
V
CC
GND
10 k
GND
Output
to CMOS Logic
V
EE
+
LM311
V
CC1
V
CC
Output
V
CC2
Balance/Strobe
2N2222 or
Q1
Equivalent
1.0 k
TTL
Strobe
*D1
*Zener Diode D1
protects the comparator
from inductive kickback
and voltage transients
on the V
CC2
supply line.
Figure 18. Zero−Crossing Detector
Driving CMOS Logic
Figure 19. Relay Driver with Strobe Capability
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