Datasheet

9
LT1182/LT1183/LT1184/LT1184F
TYPICAL PERFORMANCE CHARACTERISTICS
U
W
CCFL V
SW
Current Limit
vs Duty Cycle
CCFL V
SW
Sat Voltage
vs Switch Current
SWITCH CURRENT (A)
0
CCFL V
SW
SAT VOLTAGE (V)
0.6
0.8
1.0
1.2
LT1182 • G37
0.4
0.2
0.5
0.7
0.9
0.3
0.1
0
0.3
0.6
0.9
1.5
T = –5°CT = 125°C
T = 25°C
DUTY CYCLE (%)
0
0
CCFL V
SW
CURRENT LIMIT (A)
0.5
1.5
2.0
2.5
20
40
50 90
LT1182 • G39
1.0
10 30
60
70
80
T = 25°C
T = 125°C
MINIMUM
T = 0°C
LCD V
SW
Sat Voltage
vs Switch Current
SWITCH CURRENT (A)
0
LCD VSW SAT VOLTAGE (V)
1.2
1.6
2.0
1.2
LT1182 • G38
0.8
0.4
0
0.3
0.6
0.9
1.5
T = –5°C
T = 125°C
T = 25°C
DUTY CYCLE (%)
0
0
LCD V
SW
CURRENT LIMIT (A)
0.3
0.9
1.2
1.5
20
40
50 90
LT1182 • G40
0.6
10 30
60
70
80
T = 25°C
T = 125°C
MINIMUM
T = 0°C
LCD V
SW
Current Limit
vs Duty Cycle Forced Beta vs I
SW
on CCFL V
SW
CCFL I
SW
(A)
0
FORCED BETA
60
80
110
100
1.6
LT1182 • G41
40
20
50
70
90
30
10
0
0.4
0.8
1.2
0.2 1.8
0.6
1.0
1.4
2.0
LCD I
SW
(A)
0
FORCED BETA
60
80
100
1.6
LT1182 • G42
40
20
50
70
90
30
10
0
0.4
0.8
1.2
0.2 1.8
0.6
1.0
1.4
2.0
Forced Beta vs I
SW
on LCD V
SW