LT1184F_15 Datasheet, PDF (9/24 Pages) Linear Technology – CCFL/LCD Contrast Switching Regulators

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