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LT1786F

更新时间： 2023-12-20 18:45:22
品牌 Logo 应用领域
亚德诺 - ADI 开关稳压器
页数 文件大小 规格书
20页 374K
描述
SMBus 可编程的 CCFL 开关稳压器

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中文翻译

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LT1786F 数据手册

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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  
■
Grounded Lamp or Floating Lamp Configurations  
■
Precision 100µA Full-Scale DAC  
Programming Current  
2-Wire SMBus Interface  
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.  
■
■
DAC Setting Is Retained in Shutdown  
■
Wide Battery Input Range: 4.5V to 30V  
■
Open Lamp Protection  
■
Two Selectable SMBus Addresses  
U
APPLICATIO S  
■
Notebook and Palmtop Computers  
■
Portable Instruments  
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.  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
■
Personal Digital Assistants  
U
DESCRIPTIO  
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-  
U
TYPICAL APPLICATIO  
90% Efficient Floating CCFL with 2-Wire SMBus Control of Lamp Current  
CCFL BACKLIGHT APPLICATION CIRCUITS  
CONTAINED IN THIS DATA SHEET ARE COVERED  
BY U.S. PATENT NUMBER 5408162  
D1  
L1 = COILTRONICS CTX210605  
L2 = COILTRONICS CTX100-4  
*DO NOT SUBSTITUTE COMPONENTS  
COILTRONICS (561) 241-7876  
LAMP  
10  
BAT85  
C2  
27pF  
3kV  
AND OTHER PATENTS PENDING  
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  
CCFL  
8V TO 28V  
+
C3B  
+
C3A  
R2  
220k  
2.2µF  
2.2µF  
DIO  
BAT  
LT1786F  
ROYER  
35V  
C7, 1µF  
35V  
R1  
750Ω  
CCFL V  
AGND  
SHDN  
C
C1*  
0.068µF  
3V ≤ V  
≤ 6.5V  
CC  
V
CC  
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  
0mA TO 6mA LAMP CURRENT  
FOR A TYPICAL DISPLAY.  
CURRENT GIVES  
CCFL  
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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