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参数资料
| 型号： | LT1768 |
| 厂商： | Linear Technology Corporation |
| 英文描述： | High Power CCFL Controller with Multimode Dimming(大功率,冷阴极荧光灯(CCFL)控制器(电流型脉宽调制控制器)) |
| 中文描述： | 高功率CCFL控制器与多模调光（大功率，冷阴极荧光灯（CCFL）作为控制器（电流型脉宽调制控制器）） |
| 文件页数： | 1/16页 |
| 文件大小： | 208K |
| 代理商： | LT1768 |
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 that reduces supply
current to 65
μ
A. It is available in a small 16-lead
GN package.
I
Ultrawide Multimode Dimming
TM
Range
I
Multiple Lamp Capability
I
Programmable PWM Dimming Range and
Frequency
I
Precision Maximum and Minimum Lamp
Currents Ensures Lamp Lifetime
I
Open Lamp Detection and Protection
I
350kHz Switching Frequency
I
1.5A MOSFET Gate Driver
I
100mV Current Sense Threshold
I
5V Reference
I
The 16-Lead GN Package is as Small as an 8-Lead
SO Package
High Power CCFL Controller
with Multimode Dimming
September 2000
Final Electrical Specifications
I
Desktop Flat Panel Displays
I
Multiple Lamp Displays
I
Notebook LCD Displays
I
Point of Sale Displays
FEATURES
DESCRIPTIO
N
U
APPLICATIO
S
U
TYPICAL APPLICATIO
N
U
Figure 1. 14W CCFL Supply Produces a 100:1 Dimming Ratio While
Maintaining Minimum and Maximum Lamp Current Specifications
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Multimode Dimming is a trademark of Linear Technology Corporation.
* Patent Pending
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
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1768CGN | 功能描述:IC CTRLR CCFL SGL/MULT HP 16SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 照明，镇流器控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 类型:CCFL 控制器 频率:40 ~ 80 kHz 电流 - 电源:5mA 电流 - 输出:- 电源电压:4.5 V ~ 5.5 V 工作温度:-40°C ~ 85°C 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC 包装:带卷 (TR) 其它名称:90-3991V+V01 |
| LT1768CGN#PBF | 功能描述:IC CTRLR CCFL SGL/MULT HP 16SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 照明，镇流器控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 类型:CCFL 控制器 频率:40 ~ 80 kHz 电流 - 电源:5mA 电流 - 输出:- 电源电压:4.5 V ~ 5.5 V 工作温度:-40°C ~ 85°C 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC 包装:带卷 (TR) 其它名称:90-3991V+V01 |
| LT1768CGN#TR | 功能描述:IC CTRLR CCFL SGL/MULT HP 16SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 照明，镇流器控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 类型:CCFL 控制器 频率:40 ~ 80 kHz 电流 - 电源:5mA 电流 - 输出:- 电源电压:4.5 V ~ 5.5 V 工作温度:-40°C ~ 85°C 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC 包装:带卷 (TR) 其它名称:90-3991V+V01 |
| LT1768CGN#TRPBF | 功能描述:IC CTRLR CCFL SGL/MULT HP 16SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 照明，镇流器控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 类型:CCFL 控制器 频率:40 ~ 80 kHz 电流 - 电源:5mA 电流 - 输出:- 电源电压:4.5 V ~ 5.5 V 工作温度:-40°C ~ 85°C 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC 包装:带卷 (TR) 其它名称:90-3991V+V01 |
| LT1768IGN | 功能描述:IC CTRLR CCFL SGL/MULT HP 16SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 照明，镇流器控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 类型:CCFL 控制器 频率:40 ~ 80 kHz 电流 - 电源:5mA 电流 - 输出:- 电源电压:4.5 V ~ 5.5 V 工作温度:-40°C ~ 85°C 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC 包装:带卷 (TR) 其它名称:90-3991V+V01 |
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