Datasheet

LT1768
6
TYPICAL PERFOR A CE CHARACTERISTICS
UW
TEMPERATURE (°C)
3.90
3.85
3.80
3.75
3.70
3.65
3.60
3.55
3.50
3.45
3.40
V
C CLAMP
(V)
1768 G26
–50 –25 0 25
50
75
100 125
I
VC
= 500µA
TEMPERATURE (°C)
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0.60
0.55
0.50
V
C
SWITCH THRESHOLD VOLTAGE (V)
1768 G27
–50 –25 0 25
50
75
100 125
PWM VOLTAGE (V)
0
PWM INPUT CURRENT (µA)
25
20
15
10
5
0
4
1768 G28
1
2
3
5
TEMPERATURE (°C)
1.40
1.30
1.20
1.10
1.00
0.90
0.80
0.70
0.60
0.50
0.40
PWM INPUT CURRENT (µA)
1768 G29
–50 –25 0 25
50
75
100 125
V
PWM
= 2.5V
TEMPERATURE (°C)
200
180
160
140
120
100
80
60
40
20
0
BULB FAULT CURRENT THRESHOLD (µA)
1768 G31
–50 –25 0 25
50
75
100 125
GATE DUTY CYCLE (%)
120
110
100
90
80
70
60
50
40
30
20
SENSE THRESHOLD (mV)
1768 G32
0 102030
40
50
60 70 80 90 100
Lamp Fault Current Threshold
vs Temperature
Maximum Sense Threshold
vs Gate Drive Duty Cycle
PWM Pin Input Current vs
Temperature
VC Switching Threshold
vs Temperature
PWM Pin Input Current
vs Voltage
VC Clamp Voltage vs Temperature
I
RMAX
(µA)
110
108
106
104
102
100
98
96
94
92
90
I
DI01/2
TO I
RMAX
RATIO (A/A)
1768 G33
0 –60
–120
–180 –240 –300
V
PROG
= 4.5V
V
VC
= 2.5V
I
RMIN
(µA)
11.0
10.8
10.6
10.4
10.2
10.0
9.8
9.6
9.4
9.2
9.0
I
DI01/2
TO I
RMIN
RATIO (A/A)
1768 G35
0 –60
–120
–180 –240 –300
V
PROG
= 0.75V
V
VC
= 2.5V
I
DIO1/2
to I
RMAX
Ratio vs R
MAX
Current
I
DIO1/2
to I
RMAX
Ratio vs R
MAX
Current with a Lamp Fault
I
DIO1/2
to I
RMIN
Ratio vs R
MIN
Current
I
RMAX
(µA)
60
58
56
54
52
50
48
46
44
42
40
I
DI01/2
TO I
RMAX
RATIO (A/A)
1768 G34
0 –60
–120
–180 –240 –300
V
PROG
= 4.5V
V
VC
= 2.5V
I
DI01
OR I
DI02
= 0µA