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LT1786FCS 데이터시트(PDF) 11 Page - Linear Technology

부품명 LT1786FCS
상세설명  SMBus Programmable CCFL Switching Regulator
PDF  20 Pages
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제조업체  LINER [Linear Technology]
홈페이지  http://www.linear.com
Logo LINER - Linear Technology

LT1786FCS 데이터시트(HTML) 11 Page - Linear Technology

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LT1786F
TI I G DIAGRA S
Timing for SMBus Interface
tBUF
tLOW
tHIGH
tr
tf
tHD:STA
tHD:DAT
SDA
SCL
tSU:DAT
tSU:STA
tSU:STO
STOP
1786 TD01
START
START
STOP
tHD:STA
Operating Sequence
SMBus Write Byte Protocol, with SMBus Address = 0101101B,
Command Byte = 0XXXXXXXB and Data Byte = 111111XXB
IOUT
SCL
S = START
P = STOP
* = OPTIONAL
SDA
S
1
0
2
1
3
0
4
1
5
1
6
0
7
1
XX
XX
X
X
X
1
1
1
1
1
1
X
X
8
9
10
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12
13
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15
16
17
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27
P
FULL-SCALE
CURRENT
VCC
GND
1786
TD02
ZERO-SCALE
CURRENT
*
SMBUS ADDRESS
COMMAND BYTE
DATA BYTE
ADR
APPLICATIONS INFORMATION
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



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