Datasheet

21
LT1182/LT1183/LT1184/LT1184F
TYPICAL APPLICATIONS N
U
LT1184F Floating CCFL with Potentiometer Control of Lamp Current
16
15
14
13
12
11
10
9
BAT
8V TO 28V
1
2
3
4
5
6
7
8
I
CCFL

DIO
CCFL V
C

AGND
SHDN
NC
CCFL V
SW

BULB
BAT
ROYER
V
IN

REF
NC
CCFL
PGND
NC
LT1184F
LAMP
UP TO 6mA
10
6
L1
R1
750Ω
L2
100µH
321 5
4
+
+
ALUMINUM ELECTROLYTIC IS RECOMMENDED FOR C3B WITH AN 
ESR ≥ 0.5Ω TO PREVENT DAMAGE TO THE LT1184F HIGH-SIDE 
SENSE RESISTOR DUE TO SURGE CURRENTS AT TURN-ON.

C7, 1µF
C1*
0.068µF
D1
1N5818
C5
1000pF
R2
220k
R3
100k
C3A
2.2µF
35V
C4
2.2µF
1182 TA03
V
IN
≥ 3V
C3B
2.2µF
35V
C2
27pF
3kV
+
C1 MUST BE A LOW LOSS CAPACITOR, C1 = WIMA MKP-20
Q1, Q2 = ZETEX ZTX849 OR ROHM 2SC5001
L1 = COILTRONICS CTX210605
L2 = COILTRONICS CTX100-4
*DO NOT SUBSTITUTE COMPONENTS
COILTRONICS [phone]

Q2* Q1*
SHUTDOWN
0µA TO 45µA I
CCFL
CURRENT GIVES 
0mA TO 6mA LAMP CURRENT FOR A 
TYPICAL DISPLAY.
R5
50k
10 TURN
R4
15.4k
1%
D5
BAT85

NC