LXM1618-12-63 MICROSEMI, LXM1618-12-63 Datasheet - Page 5

• Manufacturer Part Number: LXM1618-12-63
• Manufacturer: MICROSEMI

Specifications of LXM1618-12-63

• Operating Temperature Classification: Commercial
• Pin Count: 10
• Lead Free Status / Rohs Status: Not Compliant

Copyright © 2002
Rev. 1.0b, 2005-01-17
to 2.0V
0.65V
~26% < P.W. < 100% of
I N T E G R A T E D
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
period
SET
(SET
H
H
L
L
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
P.W .
1
BRITE
L=GND; H=Open
SET
NC
LXM1618-12-6x
SLEEP
1
SET
and SET
H
H
1
L
L
LXM1618-12-6x
12V
2
V
SET
IN1
NC
5.0mA
6.0mA
7.0mA
8.0mA
12V
V
2
GND
BRITE
IN1
2
P R O D U C T S
LXM1618-12-6x
Inputs)
GND
RMS
RMS
RMS
RMS
V
V
LO
HI
V
V
T Y P I C A L A P P L I C A T I O N
LO
HI
CCFL
TUBE
Integrated Products
CCFL
TUBE
Microsemi
PanelMatch™
12V 6W CCFL Programmable Inverter Module
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.
connect to TTL logic signal to the
Connect V
insulation). Never connect V
will defeat lamp current regulation. If both lamp wires
have heavy high voltage insulation, connect the longest
wire to V
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 correlates with driving the CCFL at the
manufactures nominal current setting. However the SET
and SET
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 to 4 seconds without
success the inverter will shutdown. In order to restart the
inverter it is necessary to toggle the sleep input or cycle the
V
IN1
The brightness control may be a voltage output DAC
If you need to turn the inverter ON/OFF remotely,
Connect V
Use the SET
Although the SET pins are designed such that just
The inverter has a built in fault timeout function. If
input supply.
P
2
RODUCTION
LO
inputs allow the user the flexibility to adjust the
LO
. This wire is typically white.
to the low voltage wire (wire with thinner
HI
1
and SET
to high voltage wire from the lamp.
D
ATASHEET
2
(see Figure 2) inputs to select
LO
LXM1618-12-6x
to circuit ground as this
SLEEP
input.
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