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参数资料
| 型号： | LT1786FCS#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/20页 |
| 文件大小： | 0K |
| 描述： | IC SW REG CCFL SMBUS PROG 16SOIC |
| 标准包装： | 2,500 |
| 应用： | 转换器，CCFL |
| 输入电压： | 4.5 V ~ 30 V |
| 输出数： | 1 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 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) |
LT1786F
TI I G DIAGRA S
Timing for SMBus Interface
t BUF
SDA
SCL
t HD:STA
t r
t f
t HD:STA
t LOW
t HIGH
t SU:STA
t SU:STO
STOP
START
t HD:DAT
t SU:DAT
START
STOP
1786 TD01
Operating Sequence
SMBus Write Byte Protocol, with SMBus Address = 0101101B,
Command Byte = 0XXXXXXXB and Data Byte = 111111XXB
V CC
ADR
GND
SMBUS ADDRESS
COMMAND BYTE
DATA BYTE
SDA
0
1
0
1
1
0
1
X
X
X
X
X
X
X
1
1
1
1
1
1
X
X
SCL
S
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
*
P
FULL-SCALE
I OUT
CURRENT
ZERO-SCALE
S = START
1786
TD02
CURRENT
P = STOP
* = OPTIONAL
APPLICATIO N S I N FOR M ATIO N
Introduction
Current generation portable computers and instruments
use backlit Liquid Crystal Displays (LCDs). Cold Cathode
Fluorescent Lamps (CCFLs) provide the highest available
efficiency in back lighting the display. Providing the most
light out for the least amount of input power is the most
important goal. These lamps require high voltage AC to
operate, mandating an efficient high voltage DC/AC con-
verter. The lamps operate from DC, but migration effects
damage the lamp and shorten its lifetime. Lamp drive
should contain zero DC component. In addition to good
efficiency, the converter should deliver the lamp drive in
the form of a sine wave. This minimizes EMI and RF
emissions. Such emissions can interfere with other
devices and can also degrade overall operating efficiency.
Sinusoidal CCFL drive maximizes current-to-light conver-
sion in the lamp. The circuit should also permit lamp
intensity control from zero to full brightness with no
hysteresis or “pop-on.”
The small size and battery-powered operation associated
with LCD equipped apparatus dictate low component
count and high efficiency for these circuits. Size con-
straints place severe limitations on circuit architecture and
long battery life is a priority. Laptop and handheld portable
computers offer an excellent example. The CCFL and its
power supply can be responsible for almost 50% of the
11
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