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LT1182_15

更新时间： 2024-02-02 21:27:21
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
24页 340K
描述
CCFL/LCD Contrast Switching Regulators

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中文翻译

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LT1182_15 数据手册

 浏览型号LT1182_15的Datasheet PDF文件第2页浏览型号LT1182_15的Datasheet PDF文件第3页浏览型号LT1182_15的Datasheet PDF文件第4页浏览型号LT1182_15的Datasheet PDF文件第5页浏览型号LT1182_15的Datasheet PDF文件第6页浏览型号LT1182_15的Datasheet PDF文件第7页 
LT1182/LT1183/LT1184/LT1184F  
CCFL/LCD Contrast  
Switching Regulators  
U
FEATURES  
DESCRIPTION  
The LT®1182/LT1183 are dual current mode switching  
regulators that provide the control function for Cold Cath-  
odeFluorescentLighting(CCFL)andLiquidCrystalDisplay  
(LCD) Contrast. The LT1184/LT1184F provide only the  
CCFLfunction.TheICsincludehighcurrent,highefficiency  
switches, an oscillator, a reference, output drive logic,  
control blocks and protection circuitry. The LT1182 per-  
mits positive or negative voltage LCD contrast operation.  
The LT1183 permits unipolar contrast operation and pins  
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.  
■
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  
U
APPLICATIONS  
■
Notebook and Palmtop Computers  
■
Portable Instruments  
■
Automotive Displays  
Retail Terminals  
■
U
TYPICAL APPLICATION  
90% Efficient Floating CCFL Configuration with Dual Polarity LCD Contrast  
UP TO 6mA  
LAMP  
ALUMINUM ELECTROLYTIC IS RECOMMENDED FOR C3B WITH AN  
ESR ≥ 0.5Ω TO PREVENT DAMAGE TO THE LT1182 HIGH-SIDE  
SENSE RESISTOR DUE TO SURGE CURRENTS AT TURN-ON.  
CCFL BACKLIGHT APPLICATION CIRCUITS CONTAINED IN THIS  
DATA SHEET ARE COVERED BY U.S. PATENT NUMBER 5408162  
AND OTHER PATENTS PENDING  
C2  
27pF  
3kV  
10  
6
C1 MUST BE A LOW LOSS CAPACITOR, C1 = WIMA MKP-20  
Q1, Q2 = ZETEX ZTX849 OR ROHM 2SC5001  
L1 = COILTRONICS CTX210605  
L1  
3
2
1
5
4
BAT  
8V TO 28V  
L2 = COILTRONICS CTX100-4  
+
C3B  
+
+
C3A  
2.2µF  
35V  
2.2µF  
L3 = COILTRONICS CTX02-12403  
*DO NOT SUBSTITUTE COMPONENTS  
COILTRONICS (407) 241-7876  
C5  
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.  
R2  
35V  
1000pF  
220k  
R1  
C1*  
0.068µF  
750Ω  
0µA TO 45µA ICCFL  
CURRENT GIVES  
0mA TO 6mA  
BULB CURRENT.  
THIS IS EQUAL TO  
0% TO 90% DUTY  
C12  
2.2µF  
35V  
R3  
100k  
Q2*  
Q1*  
POSCON  
D5  
D3  
L3  
BAT85  
CYCLE FOR THE  
PWM SIGNAL.  
1N5934A  
24V  
6
9
C11 +  
22µF  
L2  
100µH  
4
D1  
1N5818  
35V  
D2  
1N914  
R4  
1
2
3
4
5
6
7
8
16  
2
CCFL  
PGND  
CCFL V  
46.4k  
SW  
R5, 43.2k, 1%  
V (PWM)  
0V TO 5V  
1kHz PWM  
1%  
NEGCON  
15  
14  
13  
12  
11  
10  
9
I
BULB  
BAT  
N = 1:2  
CCFL  
D4  
1N914  
+
C6  
2.2µF  
DIO  
C7, 1µF  
R12  
20k  
LT1182  
C
V
IN  
≥ 3V  
CCFL V  
AGND  
SHDN  
ROYER  
+
C4  
2.2µF  
R13  
8.45k  
1%  
V
IN  
SHUTDOWN  
FBP  
FBN  
C8, 0.68µF  
C9, 0.01µF  
R14  
1.21k  
1%  
C10  
0.01µF  
LCD V  
LCD  
C
R7, 10K  
LCD V  
SW  
PGND  
R11, 20k, 1%  
R9, 4.99k, 1%  
R10, 10k, 1%  
5V  
1182/3 TA01  
1
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