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LT1183CS Datasheet(PDF) 14 Page - Linear Technology

Part # LT1183CS
Description  CCFL/LCD Contrast Switching Regulators
PDF  24 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1183CS Datasheet(HTML) 14 Page - Linear Technology

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LT1182/LT1183/LT1184/LT1184F
BLOCK DIAGRAM
LT1184/LT1184F CCFL Regulator Top Level Block Diagram
COMP1
UNDER-
VOLTAGE
LOCKOUT
THERMAL
SHUTDOWN
2.4V
REGULATOR
SHUTDOWN
200kHz
OSC
SHUTDOWN 6
REF
ICCFL
AGND
DIO
BULB
CCFL
VC
CCFL
PGND
CCFL
VSW
ROYER
BAT
VIN
LOGIC 1
DRIVE 1
GAIN = 4.4
Q3
2
×
Q5
1
×
Q4
5
×
Q8
1
×
Q10
2
×
R1
0.125
Ω
R4
0.1
Ω
LT1184/LT1184F: REFERENCE IS BROUGHT OUT TO PIN 1.
PINS 7, 8, 9, 10 ARE NO CONNECT.
Q6
2
×
R3
1k
D2
6V
D1
Q11
Q1
13
14
12
Q7
9
×
Q9
3
×
11
25
3
15
4
16
1
VREF
1.24V
V1
0.465V
–
+
CCFL
0
µA TO
100
µA
–
+
gm
–
+
ILIM
AMP1
ANTI-
SAT1
1184 BD02
LT1184: HIGH-SIDE SENSE RESISTOR
R4 AND GM AMPLIFIER ARE REMOVED.
PIN 13 IS NO CONNECT.
APPLICATIONS INFORMATION
Introduction
Current generation portable computers and instruments
use backlit Liquid Crystal Displays (LCDs). These displays
also appear in applications extending to medical equip-
ment, automobiles, gas pumps, and retail terminals. Cold
Cathode Fluorescent Lamps (CCFLs) provide the highest
available efficiency in backlighting the display. Providing
the most light out for the least amount of input power is the
most important goal. These lamps require high voltage AC
to operate, mandating an efficient high voltage DC/AC
converter. The lamps operate from DC, but migration
effects damage the lamp and shorten its lifetime. Lamp
drive should contain zero DC component. In addition to
good efficiency, the converter should deliver the lamp
drive in the form of a sine wave. This minimizes EMI and
RF emissions. Such emissions can interfere with other
devices and can also degrade overall operating efficiency.
Sinusoidal CCFL drive maximizes current-to-light conver-
sion in the lamp. The circuit should also permit lamp
intensity control from zero to full brightness with no
hysteresis or “pop-on”.



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