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LT1186FI

更新时间： 2024-09-24 22:24:03
品牌 Logo 应用领域
凌特 - Linear 稳压器开关
页数 文件大小 规格书
16页 207K
描述
DAC Programmable CCFL Switching Regulator(Bits-to-NitsTM)

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中文翻译

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LT1186FI 数据手册

 浏览型号LT1186FI的Datasheet PDF文件第2页浏览型号LT1186FI的Datasheet PDF文件第3页浏览型号LT1186FI的Datasheet PDF文件第4页浏览型号LT1186FI的Datasheet PDF文件第5页浏览型号LT1186FI的Datasheet PDF文件第6页浏览型号LT1186FI的Datasheet PDF文件第7页 
LT1186F  
DAC Programmable  
CCFL Switching Regulator  
(Bits-to-NitsTM)  
facemodesincludingstandardSPImodeandpulsemode.  
On power-up, the DAC counter resets to half-scale and the  
DACconfigurestoSPIorpulsemodedependingonthe CS  
signal level. In SPI mode, the system microprocessor  
serially transfers the present 8-bit data and reads back the  
previous8-bitdata. Inpulsemode, theuppersixbitsofthe  
DAC configure as increment-only (1-wire interface) or  
increment/decrement(2-wireinterface)operationdepend-  
ing on the DIN signal level.  
FEATURES  
■
Wide Battery Input Range: 4.5V to 30V  
■
Grounded Lamp or Floating Lamp Configurations  
■
Open Lamp Protection  
Precision 50µA Full-Scale DAC Programming Current  
Standard SPI Mode or Pulse Mode  
DAC Setting Is Retained in Shutdown  
■
■
■
U
APPLICATIONS  
TheLT1186Fcontrolcircuitryoperatesfromalogicsupply  
voltage of 3.3V or 5V. The IC also has a battery supply  
voltage pin that operates from 4.5V to 30V. The LT1186F  
draws 6mA typical quiescent current. An active low shut-  
down pin reduces total supply current to 35µA for standby  
operation and the DAC retains its last setting. A 200kHz  
switchingfrequencyminimizesmagneticcomponentsize.  
Current mode switching techniques with cycle-by-cycle  
limiting gives high reliability and simple loop frequency  
compensation. The LT1186F is available in a 16-pin nar-  
row SO package.  
■
Notebook and Palmtop Computers  
■
Portable Instruments  
■
Retail Terminals  
U
DESCRIPTION  
The LT®1186F is a fixed frequency, current mode, switch-  
ing regulator that provides the control function for Cold  
Cathode Fluorescent Lighting (CCFL). The IC includes an  
efficient high current switch, an oscillator, output drive  
logic, control circuitry and a micropower 8-bit 50µA full-  
scale current output DAC. The DAC provides simple “bits-  
to-lamp current control” and communicates in two inter-  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Bits-to-Nits is a trademark of Linear Technology Corporation. 1 Nit = 1 Candela/meter2  
U
TYPICAL APPLICATION  
90% Efficient Floating CCFL with 1-Wire (Increment Only) Pulse Mode Control of Lamp Current  
UP TO 6mA  
LAMP  
CCFL BACKLIGHT APPLICATION CIRCUITS  
D1  
L1 = COILTRONICS CTX210605  
L2 = COILTRONICS CTX100-4  
*DO NOT SUBSTITUTE COMPONENTS  
COILTRONICS (407) 241-7876  
CONTAINED IN THIS DATA SHEET ARE COVERED  
BAT85  
C2  
27pF  
3kV  
BY U.S. PATENT NUMBER 5408162  
AND OTHER PATENTS PENDING  
10  
6
1
2
3
4
5
6
7
8
16  
15  
14  
13  
12  
11  
10  
9
C5  
1000pF  
CCFL  
L1  
CCFL V  
SW  
PGND  
3
2
1
5
4
BAT  
I
BULB  
BAT  
CCFL  
8V TO 28V  
+
C3B  
+
C3A  
R2  
220k  
2.2µF  
2.2µF  
DIO  
35V  
C7, 1µF  
35V  
LT1186F  
R1  
750Ω  
CCFL V  
AGND  
SHDN  
ROYER  
C
C1*  
0.068µF  
V
IN  
V
3.3V  
CC  
+
OR 5V  
C4  
2.2µF  
R3  
100k  
SHUTDOWN  
FROM MPU  
I
OUT  
Q2*  
Q1*  
CLK  
CS  
D
OUT  
D
IN  
L2  
100µH  
D1  
1N5818  
ALUMINUM ELECTROLYTIC IS RECOMMENDED FOR C3A AND C3B.  
LT1186F • TA01  
MAKE 3CB ESR ≥ 0.5Ω TO PREVENT DAMAGE TO THE LT1186F 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  
0µA TO 50µA I  
CCFL  
CURRENT GIVES  
0mA TO 6mA LAMP CURRENT  
FOR A TYPICAL DISPLAY.  
FOR ADDITIONAL CCFL/LCD CONTRAST APPLICATION CIRCUITS,  
REFER TO THE LT1182/83/84/84F DATA SHEET  
1
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