LT1182 LINER [Linear Technology], LT1182 Datasheet - Page 13

• Manufacturer Part Number: LT1182
• Description: CCFL/LCD Contrast Switching Regulators
• Manufacturer: LINER [Linear Technology]

BLOCK
Q2
PGND
LCD
V
LCD
LT1183: FBP AND FBN ARE TIED TOGETHER TO CREATE FB
AT PIN 10. THE REFERENCE IS BROUGHT OUT TO PIN 11.
SW
9
8
R2
0.25
LCD
V
7
C
1.24V
DRIVE 2
GAIN = 4.4
+
–
ANTI-
SAT2
AMP2
DIAGRAM
I
V2
LIM
+
SHUTDOWN
FBP
11
– –
LCD
0 A TO
+
–
100 A
FBN
10
+
–12mV
LOGIC 2
COMP2
6
W
I
LT1182/LT1183 CCFL/LCD Contrast Regulator Top Level Block Diagram
CCFL
2
SHUTDOWN
V1
0.45V
+
–
CCFL
REGULATOR
2
200kHz
Q3
2.4V
AGND
V
OSC
12
IN
5
1
Q5
Q4
5
LOCKOUT
VOLTAGE
9
UNDER-
Q7
DIO
3
LT1182/LT1183/LT1184/LT1184F
SHUTDOWN
Q6
2
Q8
1
THERMAL
D1
BULB
15
D2
6V
3
Q9
Q11
R3
1k
BAT
14
–
0.1
R4
g
m
Q10
2
ROYER
13
+
CCFL
V
4
LOGIC 1
C
COMP1
DRIVE 1
ANTI-
SAT1
GAIN = 4.4
AMP1
I
LIM
+
–
PGND
CCFL
CCFL
V
16
13
SW
1
Q1
R1
0.125
1182 BD01