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LT1786F PDF预览

LT1786F

更新时间： 2024-01-01 10:09:51
品牌 Logo 应用领域
凌特 - Linear 稳压器开关
页数 文件大小 规格书
20页 353K
描述
SMBus Programmable CCFL Switching Regulator

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中文翻译

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LT1786F 技术参数

是否Rohs认证： 符合生命周期：Transferred
零件包装代码：SOIC包装说明：SOP,
针数：16Reach Compliance Code：compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.21模拟集成电路 - 其他类型：FLUORESCENT LIGHT CONTROLLER
控制模式：CURRENT-MODE控制技术：PULSE WIDTH MODULATION
最大输入电压：30 V最小输入电压：4.5 V
标称输入电压：12 VJESD-30 代码：R-PDSO-G16
JESD-609代码：e3长度：9.9 mm
湿度敏感等级：1功能数量：1
端子数量：16最高工作温度：70 °C
最低工作温度：最大输出电流：0.1 A
封装主体材料：PLASTIC/EPOXY封装代码：SOP
封装形状：RECTANGULAR封装形式：SMALL OUTLINE
峰值回流温度（摄氏度）：260认证状态：Not Qualified
座面最大高度：1.75 mm表面贴装：YES
切换器配置：SINGLE最大切换频率：240 kHz
温度等级：COMMERCIAL端子面层：Matte Tin (Sn)
端子形式：GULL WING端子节距：1.27 mm
端子位置：DUAL处于峰值回流温度下的最长时间：30
宽度：3.9116 mmBase Number Matches：1

LT1786F 数据手册

 浏览型号LT1786F的Datasheet PDF文件第2页浏览型号LT1786F的Datasheet PDF文件第3页浏览型号LT1786F的Datasheet PDF文件第4页浏览型号LT1786F的Datasheet PDF文件第5页浏览型号LT1786F的Datasheet PDF文件第6页浏览型号LT1786F的Datasheet PDF文件第7页 
LT1786F  
SMBusProgrammable  
CCFL Switching Regulator  
to-lamp-current control” and communicates using the  
2-wire SMBus serial interface. The LT1786F acts as an  
SMBus slave device using one of two selectable SMBus  
addresses set by the address pin ADR.  
FEATURES  
■
Wide Battery Input Range: 4.5V to 30V  
■
Grounded Lamp or Floating Lamp Configurations  
■
Open Lamp Protection  
Precision 100µA Full-Scale DAC  
Programming Current  
2-Wire SMBus Interface  
Two Selectable SMBus Addresses  
DAC Setting Is Retained in Shutdown  
On Power-up, the DAC output current assumes midrange  
or zero scale, depending on the logic state of the ADR  
pin.The entire IC can be shut down through the SMBSUS  
pin or by setting the SHDN bit = 1 in the SMBus command  
byte. Digital data for the DAC output current is retained  
internallyandthesupplycurrentdropsto40µAforstandby  
operation. The active low SHDN pin disables the CCFL  
control circuitry, but keeps the DAC alive. Supply current  
in this operating mode drops to 150µA.  
■
■
■
■
U
APPLICATIONS  
■
Notebook and Palmtop Computers  
Portable Instruments  
Personal Digital Assistants  
■
TheLT1786Fcontrolcircuitryoperatesfromalogicsupply  
voltage of 3.3V or 5V. The IC also has a battery supply pin  
that operates from 4.5V to 30V. The LT1786F draws 6mA  
typical quiescent current. A 200kHz switching frequency  
minimizesmagneticcomponentsize.Currentmodeswitch-  
ing techniques with cycle-by-cycle limiting gives high  
reliability and simple loop frequency compensation. The  
LT1786F is available in a 16-pin narrow SO package.  
■
U
DESCRIPTION  
The LT®1786F 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 6-bit 100µA full-  
scale current output DAC. The DAC provides simple “bits-  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
U
TYPICAL APPLICATION  
90% Efficient Floating CCFL with 2-Wire SMBus Control of Lamp Current  
CCFL BACKLIGHT APPLICATION CIRCUITS  
D1  
L1 = COILTRONICS CTX210605  
L2 = COILTRONICS CTX100-4  
*DO NOT SUBSTITUTE COMPONENTS  
COILTRONICS (561) 241-7876  
CONTAINED IN THIS DATA SHEET ARE COVERED  
BY U.S. PATENT NUMBER 5408162  
AND OTHER PATENTS PENDING  
LAMP  
10  
BAT85  
C2  
27pF  
3kV  
6
16  
15  
14  
13  
12  
11  
10  
9
1
2
3
4
5
6
7
8
C5  
1000pF  
CCFL  
L1  
CCFL V  
SW  
PGND  
3
2
1
5
4
BAT  
I
BULB  
BAT  
LT1786F  
ROYER  
CCFL  
8V TO 28V  
+
C3B  
2.2µF  
35V  
+
C3A  
R2  
220k  
2.2µF  
DIO  
C7, 1µF  
35V  
R1  
750Ω  
CCFL V  
AGND  
SHDN  
C
C1*  
0.068µF  
3V ≤ V  
CC  
V
CC  
≤ 6.5V  
R3  
100k  
+
C4  
2.2µF  
SHUTDOWN  
I
OUT  
Q2*  
Q1*  
SMBSUS  
ADR  
SCL  
TO  
SDA  
L2  
100µH  
D1  
1N5818  
SMBus  
HOST  
1786F TA01  
ALUMINUM ELECTROLYTIC IS RECOMMENDED FOR C3A AND C3B.  
MAKE 3CB ESR ≥ 0.5Ω TO PREVENT DAMAGE TO THE LT1786F HIGH-SIDE  
SENSE RESISTOR DUE TO SURGE CURRENTS AT TURN-ON  
FOR ADDITIONAL CCFL/LCD CONTRAST APPLICATION CIRCUITS,  
REFER TO THE LT1182/83/84/84F DATA SHEET  
0µA TO 50µA I  
CCFL  
CURRENT GIVES  
0mA TO 6mA LAMP CURRENT  
FOR A TYPICAL DISPLAY.  
C1 MUST BE A LOW LOSS CAPACITOR, C1 = WIMA MKI OR MKP-20  
= PANASONIC ECH-U  
Q1, Q2 = ZETEX ZTX849 OR ROHM 2SC5001  
1
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中文翻译

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