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LT1768 Datasheet(PDF) 6 Page - Linear Technology

Part No. LT1768
Description  High Power CCFL Controller for Wide Dimming Range and Maximum Lamp Lifetime
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1768 Datasheet(HTML) 6 Page - Linear Technology

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LT1768
6
TYPICAL PERFOR A CE CHARACTERISTICS
TEMPERATURE (
°C)
3.90
3.85
3.80
3.75
3.70
3.65
3.60
3.55
3.50
3.45
3.40
1768 G26
–50
–25
0
25
50
75
100
125
IVC = 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
1768 G27
–50
–25
0
25
50
75
100
125
PWM VOLTAGE (V)
0
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
1768 G29
–50
–25
0
25
50
75
100
125
VPWM = 2.5V
TEMPERATURE (
°C)
200
180
160
140
120
100
80
60
40
20
0
1768 G31
–50
–25
0
25
50
75
100
125
GATE DUTY CYCLE (%)
120
110
100
90
80
70
60
50
40
30
20
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
IRMAX (µA)
110
108
106
104
102
100
98
96
94
92
90
1768 G33
0
–60
–120
–180
–240
–300
VPROG = 4.5V
VVC = 2.5V
IRMIN (µA)
11.0
10.8
10.6
10.4
10.2
10.0
9.8
9.6
9.4
9.2
9.0
1768 G35
0
–60
–120
–180
–240
–300
VPROG = 0.75V
VVC = 2.5V
IDIO1/2 to IRMAX Ratio vs RMAX
Current
IDIO1/2 to IRMAX Ratio vs RMAX
Current with a Lamp Fault
IDIO1/2 to IRMIN Ratio vs RMIN
Current
IRMAX (µA)
60
58
56
54
52
50
48
46
44
42
40
1768 G34
0
–60
–120
–180
–240
–300
VPROG = 4.5V
VVC = 2.5V
IDI01 OR IDI02 = 0µA


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