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| 型号： | LT1184FIS#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/24页 |
| 文件大小： | 0K |
| 描述： | IC SW REG CCFL CONTRAST 16-SOIC |
| 标准包装： | 2,500 |
| 应用： | 转换器，CCFL |
| 输入电压： | 3 V ~ 30 V |
| 输出数： | 1 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SOIC |
| 包装： | 带卷 (TR) |
LT1182/LT1183/LT1184/LT1184F
CCFL/LCD Contrast
Switching Regulators
FEATURES
DESCRIPTIO N
s
s
s
s
s
s
s
Wide Input Voltage Range: 3V to 30V
Low Quiescent Current
High Switching Frequency: 200kHz
CCFL Switch : 1.25A, LCD Switch: 625mA
Grounded or Floating Lamp Configurations
Open-Lamp Protection
Positive or Negative Contrast Capability
The LT ? 1182/LT1183 are dual current mode switching
regulators that provide the control function for Cold Cath-
ode Fluorescent Lighting (CCFL) and Liquid Crystal Display
(LCD) Contrast. The LT1184/LT1184F provide only the
CCFL function. The ICs include high current, high efficiency
switches, an oscillator, a reference, output drive logic,
control blocks and protection circuitry. The LT1182 per-
APPLICATIO N S
mits positive or negative voltage LCD contrast operation.
The LT1183 permits unipolar contrast operation and pins
s
s
s
s
Notebook and Palmtop Computers
Portable Instruments
Automotive Displays
Retail Terminals
out an internal reference. The LT1182/LT1183 support
grounded and floating lamp configurations. The LT1184F
supports grounded and floating lamp configurations. The
LT1184 supports only grounded lamp configurations. The
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO N
90% Efficient Floating CCFL Configuration with Dual Polarity LCD Contrast
UP TO 6mA
ALUMINUM ELECTROLYTIC IS RECOMMENDED FOR C3B WITH AN
ESR ≥ 0.5 ? TO PREVENT DAMAGE TO THE LT1182 HIGH-SIDE
SENSE RESISTOR DUE TO SURGE CURRENTS AT TURN-ON.
C1 MUST BE A LOW LOSS CAPACITOR, C1 = WIMA MKP-20
Q1, Q2 = ZETEX ZTX849 OR ROHM 2SC5001
LAMP
10 6
C2
27pF
3kV
L1
CCFL BACKLIGHT APPLICATION CIRCUITS CONTAINED IN THIS
DATA SHEET ARE COVERED BY U.S. PATENT NUMBER 5408162
AND OTHER PATENTS PENDING
1kHz PWM +
C7, 1 μ F
R2
220k
CCFL V SW
24V
2
9
D4
L1 = COILTRONICS CTX210605
L2 = COILTRONICS CTX100-4
L3 = COILTRONICS CTX02-12403
* DO NOT SUBSTITUTE COMPONENTS
COILTRONICS (407) 241-7876
0 μ A TO 45 μ A ICCFL
CURRENT GIVES
0mA TO 6mA
BULB CURRENT.
THIS IS EQUAL TO
0% TO 90% DUTY D5
CYCLE FOR THE BAT85
PWM SIGNAL.
R4
46.4k
V (PWM) 1% R5, 43.2k, 1%
0V TO 5V
C6
2.2 μ F
1
2
3
4
5
C5
1000pF
CCFL
PGND
I CCFL BULB
DIO BAT
LT1182
CCFL V C ROYER
AGND V IN
R3
100k
3
Q2*
16
15
14
13
12
2 1
+ C3B
2.2 μ F
35V
C1*
0.068 μ F
Q1*
L2
100 μ H
4 5
D1
1N5818
R1
750 ?
+
+ C3A
2.2 μ F
35V
+ C12
2.2 μ F
35V
D3
1N5934A
4
D2
1N914
V IN
≥ 3V
C4
2.2 μ F
BAT
8V TO 28V
EITHER NEGCON OR POSCON
MUST BE GROUNDED.
GROUNDING NEGCON GIVES
VARIABLE POSITIVE CONTRAST
FROM 10V TO 30V.
GROUNDING POSCON GIVES
VARIABLE NEGATIVE CONTRAST
FROM –10V TO – 30V.
POSCON
L3
6 C11 +
22 μ F
35V
NEGCON
N = 1:2
1N914
R12
20k
R13
8.45k
SHUTDOWN
6
C8, 0.68 μ F
7
R7, 10K 8
SHDN
LCD V C
LCD
PGND
FBP
FBN
LCD V SW
11
10
9
R9, 4.99k, 1%
C9, 0.01 μ F
R10, 10k, 1%
R11, 20k, 1%
C10
0.01 μ F
1%
R14
1.21k
1%
5V
1182/3 TA01
1
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