音影先锋亚洲天堂网|电影世界尽头的爱完整版播放|国产 熟女 91|高清无码免费观看欧美日韩|韩国一区二区三区黄色录像|美女亚洲加勒比在线|亚洲综合网 开心五月|7x成人在线入口|成人网站免费日韩毛片区|国产黄片?一级?二级?三级

LT1786FCS Datasheet

  • LT1786FCS

  • SMBus Programmable CCFL Switching Regulator

  • 353.46KB

  • 20頁

  • LINER

掃碼查看芯片數(shù)據(jù)手冊(cè)

上傳產(chǎn)品規(guī)格書

PDF預(yù)覽

LT1786F
SMBus Programmable
CCFL Switching Regulator
FEATURES
s
s
s
s
s
s
s
Wide Battery Input Range: 4.5V to 30V
Grounded Lamp or Floating Lamp Configurations
Open Lamp Protection
Precision 100碌A(chǔ) Full-Scale DAC
Programming Current
2-Wire SMBus Interface
Two Selectable SMBus Addresses
DAC Setting Is Retained in Shutdown
to-lamp-current control鈥?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碌A(chǔ) 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碌A(chǔ).
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIONS
s
s
s
Notebook and Palmtop Computers
Portable Instruments
Personal Digital Assistants
DESCRIPTION
The LT
廬
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碌A(chǔ) full-
scale current output DAC. The DAC provides simple 鈥渂its-
TYPICAL APPLICATION
90% Efficient Floating CCFL with 2-Wire SMBus Control of Lamp Current
D1
BAT85
CCFL BACKLIGHT APPLICATION CIRCUITS
CONTAINED IN THIS DATA SHEET ARE COVERED
BY U.S. PATENT NUMBER 5408162
AND OTHER PATENTS PENDING
1
2
3
C7, 1碌F
4
5
SHUTDOWN
6
7
8
CCFL
PGND
I
CCFL
DIO
CCFL V
SW
BULB
BAT
16
15
14
R2
220k
C5
1000pF
3
2
1
C3B
2.2碌F
35V
R1
750鈩?/div>
4
5
LAMP
10
6
L1 = COILTRONICS CTX210605
C2
27pF
3kV
L1
L2 = COILTRONICS CTX100-4
*DO
NOT SUBSTITUTE COMPONENTS
COILTRONICS (561) 241-7876
BAT
8V TO 28V
LT1786F
13
CCFL V
C
ROYER
AGND
SHDN
SMBSUS
ADR
V
CC
I
OUT
SCL
SDA
12
11
10
9
TO
SMBus
HOST
ALUMINUM ELECTROLYTIC IS RECOMMENDED FOR C3A AND C3B.
MAKE 3CB ESR
鈮?/div>
0.5鈩?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
U
U
U
+
+
C3A
2.2碌F
35V
+
C4
2.2碌F
3V
鈮?/div>
V
CC
鈮?/div>
6.5V
C1*
0.068碌F
R3
100k
Q2*
Q1*
L2
100碌H
D1
1N5818
1786F TA01
0碌A(chǔ) TO 50碌A(chǔ) 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

LT1786FCS 產(chǎn)品屬性

  • LT1786F

  • 50

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - 專用型

  • -

  • 轉(zhuǎn)換器，CCFL

  • 4.5 V ~ 30 V

  • 1

  • -

  • 0°C ~ 70°C

  • 表面貼裝

  • 16-SOIC（0.154"，3.90mm 寬）

  • 16-SOIC

  • 管件

LT1786FCS相關(guān)型號(hào)PDF文件下載

  • 型號(hào)
    版本
    描述
    廠商
    下載
  • 英文版
    Seoul Semiconductor [Infrared LAMP LED]
    SEOUL
  • 英文版
    No Rsense Synchronous Step-Up DC/DC Controller
    Linear
  • 英文版
    Linear Hall-Effect Sensor
    ETC
  • 英文版
    Single/Dual 4.5ns, 3V/5V, Rail-to-Rail Comparators
    LINER
  • 英文版
    UNDERSTANDING THE SUBJECT IS CUSTOMER SERVICE
    ETC
  • 英文版
    4.5ns, 3V/5V/?V, Rail-to-Rail Comparator
    Linear
  • 英文版
    Single/Dual 4.5ns, 3V/5V, Rail-to-Rail Comparators
    LINER
  • 英文版
    UNDERSTANDING THE SUBJECT IS CUSTOMER SERVICE
    ETC
  • 英文版
    Dual, 4.5ns, 3V/5V/?V, Rail-to-Rail Comparator
    Linear
  • 英文版
    4ns, 150MHz Dual Comparator with Independent Input/Output Su...
    LINER
  • 英文版
    UNDERSTANDING THE SUBJECT IS CUSTOMER SERVICE
    ETC
  • 英文版
    7ns, Low Power, 3V/5V/?V Rail-to-Rail Comparator
    Linear
  • 英文版
    UNDERSTANDING THE SUBJECT IS CUSTOMER SERVICE
    ETC
  • 英文版
    4ns, 150MHz Dual Comparator with Independent Input/Output Su...
    LINER
  • 英文版
    7ns, Low Power, 3V/5V Dual Rail-to-Rail Comparator
    Linear
  • 英文版
    7ns, Low Power, 3V/5V Dual Rail-to-Rail Comparator
    Linear
  • 英文版
    4ns, 150MHz Dual Comparator with Independent Input/Output Su...
    LINER
  • 英文版
    4ns, 150MHz Dual Comparator with Independent Input/Output Su...
    Linear
  • 英文版
    SOT-23, 44V, Over-The-Top, Micropower, Precision Rail-to-Rai...
    LINER
  • 英文版
    SOT-23, 44V, Over-the-Top, Micropower, Precision, Rail-to-Ra...
    Linear

掃碼下載APP，
一鍵連接廣大的電子世界。

在線人工客服

買家服務(wù)：
賣家服務(wù)：
技術(shù)客服：

0571-85317607

網(wǎng)站技術(shù)支持

13606545031

客服在線時(shí)間周一至周五
9:00-17:30

關(guān)注官方微信號(hào)，
第一時(shí)間獲取資訊。

建議反饋

聯(lián)系人：

聯(lián)系方式：

按住滑塊，拖拽到最右邊
>>
感謝您向阿庫提出的寶貴意見，您的參與是維庫提升服務(wù)的動(dòng)力！意見一經(jīng)采納，將有感恩紅包奉上哦！