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LT1183CS Fiches technique(PDF) 4 Page - Linear Technology

No de pièce LT1183CS
Description  CCFL/LCD Contrast Switching Regulators
PDF  24 Pages
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Fabricant  LINER [Linear Technology]
Site Internet  http://www.linear.com
Logo LINER - Linear Technology

LT1183CS Fiches technique(HTML) 4 Page - Linear Technology

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LT1182/LT1183/LT1184/LT1184F
ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VREF – ICCFL Summing Voltage
Measured on LT1183
0.760
0.795
0.830
V
q
0.725
0.795
0.865
V
VREF – ICCFL Summing Voltage
Measured on LT1184/LT1184F
0.740
0.775
0.810
V
q
0.705
0.775
0.845
V
REF1
LCD FBP/FB Reference Voltage
LT1182: Measured at FBP Pin, FBN = 1V, LCD VC = 0.8V
1.224
1.244
1.264
V
LT1183: Measured at FB Pin, LCD VC = 0.8V
q
1.214
1.244
1.274
V
REF1 Voltage Line Regulation
3V
≤ VIN ≤ 30V, LCD VC = 0.8V
q
0.01
0.03
%/V
FBP/FB Input Bias Current
LT1182: FBP = REF1, FBN = 1V, LCD VC = 0.8V
LT1183: FB = REF1, LCD VC = 0.8V
q
0.35
1.0
µA
LCD FBN/FB Offset Voltage
LT1182: Measured at FBN Pin, FBP = 0V, LCD VC = 0.8V
– 20
– 12
– 4
mV
LT1183: Measured at FB Pin, LCD VC = 0.8V
q
–27
– 12
–1
mV
Offset Voltage Line Regulation
3V
≤ VIN ≤ 30V, LCD VC = 0.8V
q
0.01
0.2
%/V
FBN/FB Input Bias Current
LT1182: FBN = Offset Voltage, FBP = 0V, LCD VC = 0.8V
LT1183: FB = Offset Voltage, LCD VC = 0.8V
q
– 3.0
– 1.0
µA
gm
FBP/FB to LCD VC Transconductance
LT1182:
∆IVC = ±25µA, FBN = 1V
650
900
1150
µmhos
LT1183:
∆IVC = ±25µA
q
500
900
1300
µmhos
FBN/FB to LCD VC Transconductance
LT1182:
∆IVC = ±25µA, FBP = GND
550
800
1050
µmhos
LT1183:
∆IVC = ±25µA
q
400
800
1200
µmhos
LCD Error Amplifier Source Current
LT1182: FBP = FBN = 1V or 0.25V,
q
50
100
175
µA
LT1183: FB = 1V or 0.25V
LCD Error Amplifier Sink Current
LT1182: FBP = FBN = 1.5V or – 0.25V,
q
35
100
175
µA
LT1183: FB = 1.5V or – 0.25V
LCD VC Low Clamp Voltage
LT1182: FBP = FBN = 1.5V, LT1183: FB = 1.5V
0.01
0.3
V
LCD VC High Clamp Voltage
LT1182: FBP = FBN = 1V, LT1183: FB = 1V
1.7
2.0
2.4
V
LCD VC Switching Threshold
LT1182: FBP = FBN = 1V, LT1183: FB = 1V, VSW DC = 0%
0.6
0.95
1.3
V
ILIM2
LCD Switch Current Limit
Duty Cycle = 50%
q
0.625
1.00
1.5
A
Duty Cycle = 75% (Note 3)
q
0.400
0.85
1.3
A
VSAT2
LCD Switch On-Resistance
LCD ISW = 0.5A
q
1.0
1.65
Ω
∆I
Q
Supply Current Increase During
LCD ISW = 0.5A
20
30
mA/A
∆ISW2
LCD Switch On-Time
Switch Minimum On-Time
Measured at CCFL VSW and LCD VSW
0.45
µs
TA = 25°C, VIN = 5V, BAT = Royer = Bulb = 12V, ICCFL = SHUTDOWN = CCFL VSW = Open, DIO = GND, CCFL VC = 0.5V,
(LT1182/LT1183) LCD VC = 0.5V, LCD VSW = Open, (LT1182) FBN = FBP = GND, (LT1183) FB = GND,
(LT1183/LT1184/LT1184F) REF = Open, unless otherwise specified.
The q denotes specifications which apply over the specified operating
temperature range.
Note 1: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formula:
LT1182CS/LT1183CS/LT1184CS/LT1184FCS: TJ = TA + (PD × 100°C/W)
Note 2: Does not include switch leakage.
Note 3: For duty cycles (DC) between 50% and 75%, minimum
guaranteed switch current is given by ILIM = 1.4(1.393 – DC) for the CCFL
regulator and ILIM = 0.7(1.393 – DC ) for the LCD contrast regulator due to
internal slope compensation circuitry.



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