LT1184F_15 Datasheet, PDF (6/24 Pages) Linear Technology – CCFL/LCD Contrast Switching Regulators

LT1182/LT1183/LT1184/LT1184F
TYPICAL PERFORMANCE CHARACTERISTICS
I_CCFL Summing Voltage
vs Temperature
0.53
0.52
0.51
0.50
0.49
0.48
0.47
V_IN = 30V
0.46
V_IN = 5V
0.45
0.44
V_IN = 3V
0.43
0.42
0.41
0.40
0.39
0.38
–75 – 50 –25 0 25 50 75 100 125 150 175
TEMPERATURE (°C)
LT1182 • G10
∆CCFL V_C Source Current for
∆I_CCFL Programming Current
vs Temperature
5.10
5.05
5.00
I_CCFL = 100µA
4.95
I_CCFL = 50µA
I_CCFL = 10µA
4.90
4.85
4.80
–75 – 50 –25 0 25 50 75 100 125 150 175
TEMPERATURE (°C)
LT1182 • G13
CCFL V_C to DIO Current Servo
Ratio vs Temperature
103
102
101
I(DIO) = 10mA
100 I(DIO) = 1mA
99
I(DIO) = 5mA
98
97
96
95
–75 – 50–25 0 25 50 75 100 125 150 175
TEMPERATURE (°C)
LT1182 • G16
I_CCFL Summing Voltage
Load Regulation
5
4
3
2
1
0
–1
–2
–3
–4
–5
–6
–7
–8
–9
–10
0
T = –55°C
T = 25°C
T = 125°C
20 40 60 80 100 120 140 160 180 200
I_CCFL PROGRAMMING CURRENT (µA)
LT1182 • G11
Positive DIO Voltage
vs Temperature
1.2
1.0
I(DIO) = 10mA
0.8
I(DIO) = 5mA
0.6
I(DIO) = 1mA
0.4
0.2
0
–75 – 50 –25 0 25 50 75 100 125 150 175
TEMPERATURE (°C)
LT1182 • G14
CCFL V_C Low Clamp Voltage
vs Temperature
0.30
0.25
0.20
0.15
0.10
0.05
0
–75 –50 –25 0 25 50 75 100 125 150 175
TEMPERATURE (°C)
LT1182 • G17
CCFL V_C Offset Sink Current
vs Temperature
10
9
8
CCFL V_C = 1.5V
7
6
5
CCFL V_C = 1.0V
4
3
2
1
0
CCFL V_C = 0.5V
–1
–2
–3
–75 – 50 –25 0 25 50 75 100 125 150 175
TEMPERATURE (°C)
LT1182 • G12
Negative DIO Voltage
vs Temperature
1.6
1.4
I(DIO) = 10mA
1.2
1.0
I(DIO) = 5mA
0.8
I(DIO) = 1mA
0.6
0.4
0.2
0
–75 –50 –25 0 25 50 75 100 125 150 175
TEMPERATURE (°C)
LT1182 • G15
CCFL V_C High Clamp Voltage
vs Temperature
2.4
2.3
2.2
2.1
2.0
1.9
1.8
1.7
–75 – 50 –25 0 25 50 75 100 125 150 175
TEMPERATURE (°C)
LT1182 • G18
6