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参数资料
| 型号： | LT1768CGN |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 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 |
| 封装： | 0.150 INCH, PLASTIC, SSOP-16 |
| 文件页数： | 9/20页 |
| 文件大小： | 301K |
| 代理商： | LT1768CGN |
LT1768
9
BLOCK DIAGRA
Figure 2. LT1768 Block Diagram
INTRODUCTION
The current trend in desktop monitor design is to migrate
the LCD (liquid crystal display) technology used in laptops
and instruments to the popular desktop display sizes. As
LCD size increases uniform backlighting requires mul-
tiple high power lamps. In addition, the lamps must have
a dimming range and lifetime expectancy comparable to
previous generations of desktop displays. Cold cathode
fluorescent lamps (CCFLs) provide the highest available
efficiency for backlighting LCD displays. The CCFL re-
quires a high voltage supply for operation. Typically, over
1000 volts is required to initiate CCFL operation, with
sustaining voltages from 200V to 800V. A CCFL can
operate from DC, but migration effects damage the CCFL
and shorten its lifetime. To achieve maximum life CCFL
drive should be sinusoidal, contain zero DC component,
and not exceed the CCFL manufacturers minimum and
maximum operating current ratings. Low crest factor
APPLICATIO
S I
FOR
ATIO
U
W
U
U
sinusoidal CCFL drive also maximizes current to light
conversion, reduces display flicker, and minimizes EMI
and RF emissions. The LT1768 high power CCFL control-
ler, with its Multimode Dimming, provides the necessary
lamp drive to enable a wide dimming range while main-
taining lamp lifetime in multiple lamp CCFL applications.
BASIC OPERATION
Referring to the circuit in Figure 1, CCFL current is con-
trolled by a DC voltage on the PROG pin of the LT1768. The
DC voltage on the PROG pin feeds the LT1768’s Multimode
Dimming block and is converted to source current into the
VC pin. As the VC pin voltage rises, the LT1768’s GATE pin
is pulse width modulated at 350kHz. The GATE pulse width
is determined on a cycle by cycle basis by the voltage on
the SENSE pin (L1’s current multiplied by SENSE resistor
R5) exceeding a predetermined voltage set by the VC pin.
I
RMAX
01V 4V
I
RMIN
1.25V
1.26V
SLOPE
OSC
1V
V
PWM
PWM
V
C
V
REF
R
MIN
R
MAX
V
IN
C
T
FAULT
SHDN
PROG
AGND
DI01
DIO2
GATE
SENSE
PGND
12
14
15
10
11
9
8
7
6
5
3
2
16
13
4
1
CONTROL
MODE
I
VC
V
CCLAMP
FAULT
MULTI-MODE
DIMMING BLOCK
PWM PERIOD
UNDERVOLTAGE
LOCKOUT
THERMAL
SHUTDOWN
V
REF
(I
DIO1
+ I
DIO2
)
GAIN
I
VC
I
DIO2
< 125
μ
A
I
DIO1
< 125
μ
A
SW
BLANK
V
IN
GATE
S
Q
R
1768 BD
相关PDF资料 |
PDF描述 |
|---|---|
| LT1768IGN | High Power CCFL Controller for Wide Dimming Range and Maximum Lamp Lifetime |
| LT1768 | 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)) |
| LT1769IGN | Constant-Current/ Constant-Voltage 2A Battery Charger with Input Current Limiting |
| LT1769 | Constant-Current/ Constant-Voltage 2A Battery Charger with Input Current Limiting |
| LT1769CGN | Constant-Current/ Constant-Voltage 2A Battery Charger with Input Current Limiting |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| LT1768IGN#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 |
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