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| 型号： | LT1768IGN#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/20页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR CCFL SGL/MULT HP 16SSOP |
| 标准包装： | 2,500 |
| 类型： | CCFL 控制器 |
| 频率： | 300 ~ 410 kHz |
| 电流 - 电源： | 7mA |
| 电流 - 输出： | 1.5A |
| 电源电压： | 9 V ~ 24 V |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SSOP |
| 包装： | 带卷 (TR) |
LT1768
BLOCK DIAGRA
V IN 15
V REF
OSC
V IN
GATE
16 GATE
SHDN 12
UNDERVOLTAGE
LOCKOUT
V REF 14
THERMAL
SHUTDOWN
SW
BLANK
R MIN 11
1.26V
I RMIN
S
R MAX 10
1.25V
I RMAX
0
1V 4V
R
Q
MODE CONTROL
PROG 8
I VC
SLOPE
V CCLAMP
FAULT
4 SENSE
PWM 9
V PWM
1V
C T 7
PWM PERIOD
MULTI-MODE
DIMMING BLOCK
(I DIO1 + I DIO2 )
GAIN
I VC
I DIO1 < 125 μ A
1 PGND
I DIO2 < 125 μ A
1768 BD
13 FAULT
5
V C
6
AGND
3
DI01
2
DIO2
Figure 2. LT1768 Block Diagram
APPLICATIO N S I N FOR M ATIO N
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
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.
9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1769 | 制造商:LINER 制造商全称:Linear Technology 功能描述:4A, High Efficiency, Standalone Li Battery Charger |
| LT1769CFE | 功能描述:IC BATT CHRGR CNSTNT I/V 20TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
| LT1769CFE#PBF | 功能描述:IC BATT CHRGR CNSTNT I/V 20TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
| LT1769CFE#TR | 功能描述:IC BATT CHRGR CNSTNT I/V 20TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
| LT1769CFE#TRPBF | 功能描述:IC BATT CHRGR CNSTNT I/V 20TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
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