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參數(shù)資料
| 型號： | LT1768IGN |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | High Power CCFL Controller for Wide Dimming Range and Maximum Lamp Lifetime |
| 中文描述： | 1.5 A FLUORESCENT LIGHT CONTROLLER, 410 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 0.150 INCH, PLASTIC, SSOP-16 |
| 文件頁數(shù)： | 1/20頁 |
| 文件大小： | 301K |
| 代理商： | LT1768IGN |
LT1768
1
The LT
1768 is designed to control single or multiple cold
cathode fluorescent lamp (CCFL) displays. A unique Mul-
timode Dimming scheme* combines both linear and PWM
control functions to maximize lamp life, efficiency, and
dimming range. Accurate maximum and minimum lamp
currents can be easily set. The LT1768 can detect and
protect against lamp failures and overvoltage start-up
conditions. It is designed to provide maximum flexibility
with a minimum number of external components.
The LT1768 is a current mode PWM controller with a 1.5A
MOSFET driver for high power applications. It contains a
350kHz oscillator, 5V reference, and a current sense
comparator with a 100mV threshold. It operates from an
8V to 24V input voltage. The LT1768 also has undervoltage
lockout, thermal limit, and a shutdown pin that reduces
supply current to 65
μ
A. It is available in a small 16-lead
SSOP package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Multimode Dimming is a trademark of Linear Technology Corporation.
*Patent Pending
I
Ultrawide Multimode Dimming
TM
Range
I
Multiple Lamp Capability
I
Programmable PWM Dimming Range and
Frequency
I
Precision Maximum and Minimum Lamp
Currents Maximize Lamp Lifetime
I
No Lamp Flicker Under All Supply and Load
Conditions
I
Open Lamp Detection and Protection
I
350kHz Switching Frequency
I
1.5A MOSFET Gate Driver
I
100mV Current Sense Threshold
I
5V Reference Voltage Output
I
The 16-Lead SSOP Package
APPLICATIOU
High Power CCFL Controller
for Wide Dimming Range and
Maximum Lamp Lifetime
DESCRIPTIO
U
I
Desktop Flat Panel Displays
I
Multiple Lamp Displays
I
Notebook LCD Displays
I
Point of Sale Terminal Displays
Figure 1. 14W CCFL Supply Produces a 100:1 Dimming Ratio While
Maintaining Minimum and Maximum Lamp Current Specifications
1768 TA01
C4
0.33
μ
F
250
1/4W
R5*
0.025
Q1
Q1
L1
68
μ
H
T1
33pF
33pF
0.1
μ
F
C1
33
μ
F
Si3456DY
MBRS130T3
LAMP
LAMP
R3
60.4k
R1
49.9k
R2
40.2k
R4
16.2k
C3
0.1
μ
F
C4
10
μ
F
C2
0.033
μ
F
V
8V – 24V
PROG
0V TO 5V OR
1kHz PWM
LT1768
DI02
PGND
GATE
V
C
AGND
C
T
PROG
DI01
SENSE
SHDN
R
MIN
R
MAX
PWM
FAULT
V
REF
V
IN
5V
2200pF
100
6
10
4
5
3
2
1
C4-WIMA MKP2
L1-COILTRONICS UP4-680
T1-2 CTX110607 IN PARALLEL
Q1-ZDT1048
*R5 CAN BE METAL PCB TRACE
LAMP CURRENT (mA)
0
10000
1000
100
10
1
0.1
8
1768 TA01b
2
4
6
10
DIMMING RATIO (NITS/NITS)
LAMP OUTPUT (NITS)
LAMP MANUFACTURERS
SPECIFIED CURRENT RANGE
Lamp Output and Dimming
Ratio vs Lamp Current
FEATURES
TYPICAL APPLICATIO
U
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|---|---|
| LT1768 | High Power CCFL Controller with Multimode Dimming(大功率,冷陰極熒光燈(CCFL)控制器(電流型脈寬調(diào)制控制器)) |
| LT1769IGN | Constant-Current/ Constant-Voltage 2A Battery Charger with Input Current Limiting |
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| LT1768IGN#PBF | 功能描述:IC CTRLR CCFL SGL/MULT HP 16SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 照明，鎮(zhèn)流器控制器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:CCFL 控制器 頻率:40 ~ 80 kHz 電流 - 電源:5mA 電流 - 輸出:- 電源電壓:4.5 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC 包裝:帶卷 (TR) 其它名稱:90-3991V+V01 |
| LT1768IGN#TR | 功能描述:IC CTRLR CCFL SGL/MULT HP 16SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 照明，鎮(zhèn)流器控制器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:CCFL 控制器 頻率:40 ~ 80 kHz 電流 - 電源:5mA 電流 - 輸出:- 電源電壓:4.5 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC 包裝:帶卷 (TR) 其它名稱:90-3991V+V01 |
| LT1768IGN#TRPBF | 功能描述:IC CTRLR CCFL SGL/MULT HP 16SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 照明，鎮(zhèn)流器控制器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:CCFL 控制器 頻率:40 ~ 80 kHz 電流 - 電源:5mA 電流 - 輸出:- 電源電壓:4.5 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC 包裝:帶卷 (TR) 其它名稱:90-3991V+V01 |
| LT1769 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:4A, High Efficiency, Standalone Li Battery Charger |
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