Datasheet

13
LT1637
1637fd
TYPICAL APPLICATIO S
U
–
+
LT1637
1637 TA03
V
IN
0.22µF
C
L
≤ 4700pF
150Ω
Positive Supply Rail Current Sense
Optional Output Compensation for
Capacitive Loads Greater Than 200pF
–
+
LT1637
IN1
(0V TO 44V)
IN2
(0V TO 44V)
2N5087
2N5210
1637 TA04
1M
V
OUT
1M
V
CC
100
1M
10k
HYSTERESIS =
10k
1M
3V TO 44V
–
+
LT1637
3V TO 44V
3V
R1
200Ω
R
S
0.2Ω
R2
2k
V
OUT
(0V TO 2.7V)
Q1
2N3904
1637 TA06
LOAD
I
LOAD
V
OUT
(R
S
)(R2/R1)
I
LOAD
=
Over-The-Top Comparator with Hysteresis
Lamp Outage Detector
Over-The-Top Current Sense
–
+
LT1637
5k
1M
5V TO 44V
3V
100k
0.5Ω
LAMP
ON/OFF
OUT
1637 TA05
OUT = 0V FOR GOOD BULB
3V FOR OPEN BULB
–
+
LT1637
5V
200Ω
200Ω
0.2Ω
2k
0V TO 4.3V
1637 TA02
V
OUT
= (2Ω)(I
LOAD
)
Q1
2N3904
LOAD
I
LOAD