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參數(shù)資料
| 型號： | LT1786FCS |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Isolated Flyback Switching Regulator with 9V Output |
| 中文描述： | 0.1 A FLUORESCENT LIGHT CONTROLLER, 240 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 0.150 INCH, PLASTIC, SO-16 |
| 文件頁數(shù)： | 1/20頁 |
| 文件大小： | 350K |
| 代理商： | LT1786FCS |
1
LT1786F
TYPICAL APPLICATIO
N
U
FEATURES
I
Wide Battery Input Range: 4.5V to 30V
I
Grounded Lamp or Floating Lamp Configurations
I
Open Lamp Protection
I
Precision 100
μ
A Full-Scale DAC
Programming Current
I
2-Wire SMBus Interface
I
Two Selectable SMBus Addresses
I
DAC Setting Is Retained in Shutdown
APPLICATIO
S
U
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.
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
internally and the supply current drops to 40
μ
A for standby
operation. The active low SHDN pin disables the CCFL
control circuitry, but keeps the DAC alive. Supply current
in this operating mode drops to 150
μ
A.
The LT1786F control circuitry operates from a logic supply
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
minimizes magnetic component size. Current mode switch-
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.
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 100
μ
A full-
scale current output DAC. The DAC provides simple “bits-
I
Notebook and Palmtop Computers
I
Portable Instruments
I
Personal Digital Assistants
DESCRIPTIO
N
U
90% Efficient Floating CCFL with 2-Wire SMBus Control of Lamp Current
BAT
8V TO 28V
16
15
14
13
12
11
10
9
I
CCFL
DIO
CCFL V
C
AGND
SHDN
SMBSUS
ADR
CCFL V
SW
BULB
BAT
ROYER
V
CC
I
OUT
SCL
SDA
CCFL
PGND
LT1786F
LAMP
10
6
L1
R1
750
L2
100
μ
H
3
2
+
1
5
4
+
+
C7, 1
μ
F
C1*
0.068
μ
F
C5
1000pF
R2
220k
R3
100k
C3A
2.2
μ
F
35V
C4
2.2
μ
F
3V
≤
V
CC
≤
6.5V
TO
SMBus
HOST
1786F TA01
C3B
2.2
μ
F
35V
C2
27pF
3kV
Q2*
Q1*
SHUTDOWN
ALUMINUM ELECTROLYTIC IS RECOMMENDED FOR C3A AND C3B.
MAKE 3CB ESR
≥
0.5
TO PREVENT DAMAGE TO THE LT1786F HIGH-SIDE
SENSE RESISTOR DUE TO SURGE CURRENTS AT TURN-ON
C1 MUST BE A LOW LOSS CAPACITOR, C1 = WIMA MKI OR MKP-20
= PANASONIC ECH-U
Q1, Q2 = ZETEX ZTX849 OR ROHM 2SC5001
0
μ
A TO 50
μ
A I
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
D1
BAT85
1
2
3
4
5
6
7
8
D1
1N5818
L1 = COILTRONICS CTX210605
L2 = COILTRONICS CTX100-4
*
DO NOT SUBSTITUTE COMPONENTS
COILTRONICS (561) 241-7876
CCFL BACKLIGHT APPLICATION CIRCUITS
CONTAINED IN THIS DATA SHEET ARE COVERED
BY U.S. PATENT NUMBER 5408162
AND OTHER PATENTS PENDING
SMBus
Programmable
CCFL Switching Regulator
, LTC and LT are registered trademarks of Linear Technology Corporation.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1786FCS#PBF | 功能描述:IC SW REG CCFL SMBUS PROG 16SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
| LT1786FCS#TR | 功能描述:IC REG SW CCFL SMBUS PROG 16SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
| LT1786FCS#TRPBF | 功能描述:IC SW REG CCFL SMBUS PROG 16SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
| LT1787 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Precision, High Side Current Sense Amplifiers |
| LT1787_1 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Precision, High Side Current Sense Amplifiers |
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