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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： | 15/16页 |
| 文件大小： | 208K |
| 代理商： | LT1768 |
LT1768
15
APPLICATIO
S I
FOR
ATIO
U
Supply Bypass and Layout Considerations
Proper supply bypassing and layout techniques must be
used to insure proper regulation, avoid display flicker, and
insure long term reliability.
Figure 8 shows the application’s critical high current paths
in thick lines. Ideally, all components in the high current
path should be placed as close as possible and connected
with short thick traces. The most critical consideration is
that T1’s center tap, the Schottky diode D1, LT1768’s V
IN
pin, and a low ESR capacitor (C1) be connected directly
W
U
U
together with minimum trace between them. If space
constraints prohibit the transformer T1 placement next to
C1, local bypassing (C2) for the center tap of transformer
T1 should be used.
Special attention is also required for the layout of the high
voltage section to avoid any unpleasant surprises. Please
refer to the references for an extensive discussion on high
voltage layout techniques.
Applications Support
Linear Technology invests an enormous amount of time,
resources, and technical expertise in understanding, de-
signing and evaluating backlight solutions for systems
designers. The design of an efficient and compact back-
light system is a study of compromise in a transduced
electronic system. Every aspect of the design is interre-
lated and any design change requires complete re-evalu-
ation for all other critical design parameters. Linear
Technology has engineered one of the most complete test
and evaluation setups for backlight designs and under-
stands the issues and trade-offs in achieving a compact,
efficient and economical customer solution. Linear Tech-
nology welcomes the opportunity to discuss, design,
evaluate, and optimize any backlight system with a cus-
tomer. For further information on backlight designs, con-
sult the references below.
References
1. Williams, Jim. November 1995. A Fourth Generation of
LCD Backlight Technology. Linear Technology Corpora-
tion, Application Note 65.
1768 F07
C1
D1
L1
T1
LT1768
GATE
PGND
VIN
VIN
SENSE
C2
*OPTIONAL
BOLD LINES INDICATE
HIGH CURRENT PATHS
Figure 8.
LT1768
V
REF
PROG
AGND
1768 TA05
R1
49.9k
C1
10
μ
F
0 – >5V
1kHz PWM
DC Intensity Control
PWM Intensity Control
1768 TA04
LT1768
V
REF
PROG
AGND
R1
100k
POT
TYPICAL APPLICATIO
N
S
LT1768
V
REF
PROG
AGND
1768 TA06
R1
49.9k
R
ID
R1
10k
C1
10
μ
F
0 – >3.3V
1kHz PWM
Q1
VN2222LL
PWM Intensity Control From 3.3V Logic
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| 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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