LXM1618-03-22 Microsemi Analog Mixed Signal Group, LXM1618-03-22 Datasheet - Page 5

• Manufacturer Part Number: LXM1618-03-22
• Description: MOD INVERTER CCFL 2.2W 3.3V PROG
• Manufacturer: Microsemi Analog Mixed Signal Group
• Series: LXM1618-03-2xr
• Type: Inverters for CCFL and UV Lampsr

Specifications of LXM1618-03-22

• Voltage - Input: 3.3V
• Output: 130V
• Size / Dimension: 3.39" L x 0.63" W x 0.18" H (86mm x 16mm x 4.6mm)
• Mounting Type: Chassis Mount
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Copyright © 2002
Rev. 1.1a 2005-01-17
to 2.0V
0.65V
I N T E G R A T E D
~26% < P.W. < 100% of
2.7K
Figure 1A – PWM Brightness Control
20K
DAC or
Pot
10µs to 125µS
(Output current set to maximum)
PW M Signal
from System
Figure 2 – Max Output Current
Figure 1 – Brightness Control
BRITE
SLEEP
SET
period
(SET
H
H
L
L
P.W .
1
BRITE
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
L=GND; H= Open
SET
NC
LXM1618-03-2x
SLEEP
1
SET
and SET
H
H
1
L
L
LXM1618-03-2x
3.3V
2
V
SET
IN1
NC
3.3V
3.5mA
4.0mA
4.5mA
5.0mA
V
2
GND
IN1
BRITE
2
P R O D U C T S
LXM1618-03-2x
Inputs)
GND
RMS
RMS
RMS
RMS
V
V
LO
HI
V
V
LO
T Y P I C A L A P P L I C A T I O N
HI
CCFL
TUBE
CCFL
TUBE
Integrated Products
Microsemi
PanelMatch™
3.3V 2.2W CCFL Programmable Inverter Module
The brightness control may be a voltage output DAC or
other voltage source, a digital pot or 20K manual pot. The
inverter contains an internal 10K pull-up to 3V to bias the
pot add a 2.7K resistor to set the lower threshold voltage.
A 3.3V Logic Level PWM signal from a micro-controller
may also be used as shown in Figure 1A.
If you need to turn the inverter ON/OFF remotely, connect
to TTL logic signal to the
Connect V
V
Never connect V
lamp current regulation. If both lamp wires have heavy
high voltage insulation, connect the longest wire to V
This wire is typically white.
the desired maximum output current. Using these two pins
in combination allows the inverter to match a wide variety
of panels from different manufactures. Generally the best
lamp lifetime and efficiency correlates with driving the
CCFL at the manufactures nominal current setting.
However the SET
flexibility to adjust the current to the maximum allowable
output current to increase panel brightness at the expense of
some reduced lamp life.
leaving them open or grounding them is all that is needed to
set the output current, they can also be actively set. Using a
open collector or open drain logic signal will allow you to
reduce the lamp current for situations where greater dim
range is required, as an example in nighttime situations. In
conjunction with a light sensor or other timer the panel
could be set to higher brightness (maximum output current)
for daytime illumination and lower brightness (minimum or
typical output current) at nighttime. Since the dim ratio is a
factor the peak output current, using this technique the
effective dim ratio can be increased. Conversely the SET
inputs could be used to overdrive the lamp temporarily to
facilitate faster lamp warm up at initial lamp turn on. Of
course any possible degradation on lamp life from such
practices is the users responsibility as not all lamps are
designed to be overdriven.
the output is open (lamp disconnected or broken) or shorted
the inverter will attempt to strike the lamp for several
seconds. After about 2 seconds without success the inverter
will shutdown.
necessary to toggle the sleep input or cycle the V
supply.
LO
to the low voltage wire (wire with thinner insulation).
Use the SET
Although the SET pins are designed such that just
The inverter has a built in fault timeout function. If
P
RODUCTION
HI
to high voltage wire from the lamp. Connect
1
LO
1
In order to restart the inverter it is
and SET
and SET
to circuit ground as this will defeat
D
SLEEP
ATASHEET
2
(see Figure 2) inputs to select
2
inputs allow the user the
input.
LXM1618-03-2x
IN1
input
LO
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