LXMG1618-12-41 MICROSEMI, LXMG1618-12-41 Datasheet - Page 5

• Manufacturer Part Number: LXMG1618-12-41
• Manufacturer: MICROSEMI

Specifications of LXMG1618-12-41

• Operating Temperature Classification: Commercial
• Pin Count: 10
• Lead Free Status / Rohs Status: Compliant

Copyright © 2002
Rev. 1.1, 2006-11-13
0.65V
TM
2.0V
to
~26% < P.W. < 100% of period
Figure 1A – PWM Brightness Control
2.7K
20K
DAC or
Pot
(Output current set to maximum)
Figure 2 – Max Output Current
Figure 1 – Brightness Control
10µs to 125µS
from System
BRITE
PWM Signal
SLEEP
SET
(SET
H
H
L
L
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
1
L=GND; H=Open
BRITE
LXMG1618-12-4x
SET
P.W.
NC
SLEEP
1
SET
and SET
H
H
L
L
1
LXMG1618-12-4x
2
12V
V
SET
NC
IN1
5.0mA
5.5mA
6.0mA
6.5mA
12V
V
2
GND
IN1
2
LXMG1618-12-4x
BRITE
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
Integrated Products
TUBE
CCFL
Microsemi
®
PanelMatch™
12V 4W 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.
Use the SET
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.
Although the SET pins are designed such that just 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 inverter has a built in fault timeout function. If 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).
P
RODUCTION
HI
1
to high voltage wire from the lamp. Connect
and SET
LO
In order to restart the inverter it is
1
and SET
to circuit ground as this will defeat
2
D
(see Figure 2) inputs to select the
SLEEP
ATASHEET
2
inputs allow the user the
input.
LXMG1618-12-4x
IN1
input
LO
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