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| 型号： | LT1786FCS#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/20页 |
| 文件大小： | 0K |
| 描述： | IC SW REG CCFL SMBUS PROG 16SOIC |
| 标准包装： | 50 |
| 应用： | 转换器，CCFL |
| 输入电压： | 4.5 V ~ 30 V |
| 输出数： | 1 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SOIC |
| 包装： | 管件 |
LT1786F
SMBus Programmable
CCFL Switching Regulator
FEATURES
to-lamp-current control” and communicates using the
2-wire SMBus serial interface. The LT1786F acts as an
s
s
s
s
s
s
s
Grounded Lamp or Floating Lamp Configurations
Precision 100 μ A Full-Scale DAC
Programming Current
2-Wire SMBus Interface
DAC Setting Is Retained in Shutdown
Wide Battery Input Range: 4.5V to 30V
Open Lamp Protection
Two Selectable SMBus Addresses
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
Notebook and Palmtop Computers
APPLICATIO S
s
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.
s
s
Portable Instruments
Personal Digital Assistants
The LT1786F control circuitry operates from a logic supply
voltage of 3.3V or 5V. The IC also has a battery supply pin
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 100 μ A full-
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.
scale current output DAC. The DAC provides simple “bits-
TYPICAL APPLICATIO
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
LAMP
10 6
C2
27pF
3kV
L1 = COILTRONICS CTX210605
L2 = COILTRONICS CTX100-4
* DO NOT SUBSTITUTE COMPONENTS
1
CCFL
PGND
CCFL V SW
16
C5
1000pF
L1
COILTRONICS (561) 241-7876
C7, 1 μ F
SHUTDOWN
2
3
4
5
6
7
I CCFL BULB
DIO BAT
LT1786F
CCFL V C ROYER
AGND V CC
SHDN I OUT
SMBSUS SCL
15
14
13
12
11
10
+
C4
2.2 μ F
3V ≤ V CC
≤ 6.5V
R3
100k
R2
220k
3
Q2*
2 1
+ C3B
2.2 μ F
35V
C1*
0.068 μ F
Q1*
4
5
R1
750 ?
+
C3A
2.2 μ F
35V
BAT
8V TO 28V
8
ADR
SDA
9
TO
SMBus
HOST
L2
100 μ H
D1
1N5818
ALUMINUM ELECTROLYTIC IS RECOMMENDED FOR C3A AND C3B.
MAKE 3CB ESR ≥ 0.5 ? TO PREVENT DAMAGE TO THE LT1786F HIGH-SIDE
1786F TA01
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
0 μ A TO 50 μ A 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
Q1, Q2 = ZETEX ZTX849 OR ROHM 2SC5001
1
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相关代理商/技术参数 |
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| LT1787 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Precision, High Side Current Sense Amplifiers |
| LT1787_1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Precision, High Side Current Sense Amplifiers |
| LT1787CMS8 | 功能描述:IC AMP PREC CURRENT SENSE 8MSOP RoHS:否 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:LinCMOS™ 放大器类型:通用 电路数:4 输出类型:- 转换速率:0.05 V/µs 增益带宽积:110kHz -3db带宽:- 电流 - 输入偏压:0.7pA 电压 - 输入偏移:210µV 电流 - 电源:57µA 电流 - 输出 / 通道:30mA 电压 - 电源，单路/双路(±):3 V ~ 16 V，±1.5 V ~ 8 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SOIC 包装:管件 产品目录页面:865 (CN2011-ZH PDF) 其它名称:296-1834296-1834-5 |
| LT1787CMS8#PBF | 功能描述:IC AMP PREC CURRENT SENSE 8MSOP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:LinCMOS™ 放大器类型:通用 电路数:4 输出类型:- 转换速率:0.05 V/µs 增益带宽积:110kHz -3db带宽:- 电流 - 输入偏压:0.7pA 电压 - 输入偏移:210µV 电流 - 电源:57µA 电流 - 输出 / 通道:30mA 电压 - 电源，单路/双路(±):3 V ~ 16 V，±1.5 V ~ 8 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SOIC 包装:管件 产品目录页面:865 (CN2011-ZH PDF) 其它名称:296-1834296-1834-5 |
| LT1787CMS8#TR | 功能描述:IC AMP PREC CURRENT SENSE 8MSOP RoHS:否 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:LinCMOS™ 放大器类型:通用 电路数:4 输出类型:- 转换速率:0.05 V/µs 增益带宽积:110kHz -3db带宽:- 电流 - 输入偏压:0.7pA 电压 - 输入偏移:210µV 电流 - 电源:57µA 电流 - 输出 / 通道:30mA 电压 - 电源，单路/双路(±):3 V ~ 16 V，±1.5 V ~ 8 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SOIC 包装:管件 产品目录页面:865 (CN2011-ZH PDF) 其它名称:296-1834296-1834-5 |
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