LX1695
TM
庐
Switched Royer CCFL Inverter Monitor IC
P
RODUCTION
D
ATA
S
HEET
DESCRIPTION
KEY FEATURES
WWW .
Microsemi
.C
OM
The LX1695 is a general purpose
DC to PWM generator with
supervisory functions for switched
Royer CCFL inverter modules used in
single or multiple lamp desktop
monitors and LCD TV sets.
It
integrates a PWM that generates
digital (burst mode) dimming from a
DC brightness control input, and a
protection circuit that shuts off the
Royer oscillator if lamp ignition does
not occur in a timely manner, or in the
event of one or more open lamps.
Strike and initial open lamp timeout is
user programmable with an external
RC, and PWM frequency is
programmable with a single external
resistor.
The DIM_FREQ pin can also accept
an external clock signal to program
and/or synchronize the Royer output
frequency.
This low cost eight pin IC includes
under-voltage lockout and a logical
ENABLE input that permits shutting
down the Royer inverter(s) remotely
without removing their power. A single
output pin can be expanded with
external transistors to drive any number
of Royer circuits, giving a single device
the ability to control very large displays
for LCD TV applications or single lamp
panels in notebooks and web tablets.
The device is available in either an 8
pin plastic DIP or SOIC package.
Single Resistor Programs
Output Frequency
Allows External Synchronized
PWM
Open Lamp Sense Protection
Programmable Fault Delay
Enable and UV Lockout
Preset 3.125% Minimum
Output Duty Cycle
APPLICATIONS/BENEFITS
DC to PWM Generator
Single or Multi Lamp Designs
Desktop Monitors
LCD TV
Industrial Displays
IMPORTANT:
For the most current data, consult
MICROSEMI鈥檚
website:
PRODUCT HIGHLIGHT
Wide Range Dimming For a Fixed Royer Inverter
External CLK Override
allows Syncronization
Single Resistor sets
Programmable Clock Frequency
30 to 600 Hertz x 512
OPTIONAL
DIM_FREQ
OLSNS
GND
ROYER
VDD
Open Lamp Detection Input
Gated for Royer High
Royer Inverter
Royer Bias Drive 30 to 600 Hertz
VDD
Fixed Input
Supply 4.5 to 5.5V
ENABLE
Logic High Enable
ENABLE
LX1695
FLT_DLY
BRITE_IN
BRITE_IN
Duty Cycle Control
0 to 2V = 3% to 100%
Programmable lamp
strike interval at
power on or enable
LX1695
LX1695
PACKAGE ORDER INFO
T
J
(掳C)
-40 to 85
M
Plastic DIP
8-Pin
RoHS / Pb-free
DM
Plastic SOIC
8-Pin
RoHS / Pb-free
LX1695IM
LX1695IDM
Note: Available in Tape & Reel. Append the letters 鈥淭R鈥?to the part number. (i.e.
LX1695IDM-TR)
RoHS compliant.
Copyright
漏
2004
Rev. 1.0a, 2006-01-06
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
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