LT1184F_15 Datasheet, PDF (22/24 Pages) Linear Technology – CCFL/LCD Contrast Switching Regulators

LT1182/LT1183/LT1184/LT1184F
TYPICAL APPLICATIONS N
LT1182/LT1183 I_CCFL PWM Programming
V (PWM)
0V TO 5V
1kHz PWM
0% to 90% DC =
0µA to 50µA
R1
40.5k
+
R2
40.5k
TO I_CCFL PIN
C1
R1 AND R2 ARE IDEAL VALUES.
2.2µF _{USE NEAREST 1% VALUE.}
1182 TA04
LT1184/LT1184F I_CCFL PWM Programming
V (PWM) ^R1
0V TO 5V ^40.35k
1kHz PWM
0% to 90% DC =
0µA to 50µA
+
R2
40.35k
TO I_CCFL PIN
C1
R1 AND R2 ARE IDEAL VALUES.
2.2µF USE NEAREST 1% VALUE.
1182 TA05
LT1183 I_CCFL Programming
with Potentiometer Control
V_REF
R1
R2
15.9k
50k
R1 AND R2 ARE IDEAL VALUES.
USE NEAREST 1% VALUE.
I_CCFL = 12µA TO 50µA.
TO I_CCFL PIN
1182 TA06
LT1184/LT1184F I_CCFL Programming
with Potentiometer Control
V_REF
R1
R2
15.5k
50k
R1 AND R2 ARE IDEAL VALUES.
USE NEAREST 1% VALUE.
I_CCFL = 12µA TO 50µA.
TO I_CCFL PIN
1182 TA07
LT1182/LT1183/LT1184/LT1184F
I_CCFL Programming with DAC Control
R1
5k
DAC
TO I_CCFL PIN
STRAY OUTPUT
CAPACITANCE
CURRENT SOURCE
DAC
R1 DECOUPLES THE DAC OUTPUT CAPACITANCE
FROM THE I_CCFL PIN.
1182 TA12
LT1183 I_CCFL PWM Programming with V_REF
V (PWM)
0V TO 5V
1kHz PWM
0% to 90% DC =
0µA to 50µA
R1
330Ω
FROM V_REF
Q1
VN2222L
R2
R3
7.15k _7.15k
+
TO I_CCFL PIN
C1
22µF
R1 PREVENTS OSCILLATION.
R2 AND R3 ARE IDEAL VALUES.
USE NEAREST 1% VALUE.
1182 TA08
LT1184/LT1184F I_CCFL PWM Programming with V_REF
V (PWM)
0V TO 5V
1kHz PWM
0% to 90% DC =
0µA to 50µA
R1
330Ω
FROM V_REF
Q1
VN2222L
R2
R3
6.98k _6.98k
+
TO I_CCFL PIN
C1
22µF
R1 PREVENTS OSCILLATION.
R2 AND R3 ARE IDEAL VALUES.
USE NEAREST 1% VALUE.
1182 TA09
LT1183 I_CCFL PWM Programming with V_REF
FROM V_REF
V (PWM)
0V TO 5V
1kHz PWM
10 to 100% DC =
50µA TO 0µA
R1
3.57k ^R2
3.57k
Q1
+
VN2222L
R3
7.15k
C1
22µF
TO I_CCFL PIN
R1, R2 AND R3 ARE IDEAL VALUES.
USE NEAREST 1% VALUE.
1182 TA10
LT1184/LT1184F I_CCFL PWM Programming with V_REF
FROM V_REF
V (PWM)
0V TO 5V
1kHz PWM
10 to 100% DC =
50µA TO 0µA
R1
3.48k ^R2
3.48k
Q1
+
VN2222L
R3
6.98k
C1
22µF
TO I_CCFL PIN
R1, R2 AND R3 ARE IDEAL VALUES.
USE NEAREST 1% VALUE.
1182 TA11
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