LXMG1617A-05-6X MICROSEMI [Microsemi Corporation], LXMG1617A-05-6X Datasheet - Page 5

• Manufacturer Part Number: LXMG1617A-05-6X
• Description: 5V 6W CCFL Programmable Inverter Module
• Manufacturer: MICROSEMI [Microsemi Corporation]

Copyright © 2007
Rev. 1.0, 2007-09-28
0V to
2.0V
0 < P.W. < 100% of period
TM
500k
Figure 1A – PWM Brightness Control
DAC or
Pot
10µs to 500µS
PWM Signal
from System
(output current set to maximum)
Figure 2 – Max Output Current
Figure 1 – Brightness Control
BRITE
SLEEP
SET
(SET
H
H
L
L
P.W.
1
LXMG1617A-05-6x
BRITE
SET
L=GND; H=Open
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
NC
SLEEP
1
SET
and SET
1
H
H
LXMG1617A-05-6x
L
L
2
5V
V
SET
NC
IN
5.0mA
6.0mA
7.0mA
8.0mA
2
5V
V
GND
BRITE
IN
2
LXMG1617A-05-6x
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
Analog Mixed Signal Group
CCFL
TUBE
®
Microsemi
PanelMatch™
5V 6W CCFL Programmable Inverter Module
The brightness control may be a voltage output DAC or
other voltage source, a digital pot or 500K manual pot. The
inverter contains an internal 215K pull-up to 3V to bias the
pot, if desired; add a resistor to set the lower threshold
voltage above the absolute minimum dim level capability.
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 manufacturers. 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.
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 an 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 of both the burst duty cycle and the
peak output current, using this technique the effective dim
ratio can be increased greater than the burst duty cycle
alone. 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 user’s
responsibility since 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 up to about one
second, after which (without success) the inverter will
shutdown, in this mode the inverter will draw about 8mA
from VIN. In order to restart the inverter it is necessary to
toggle the sleep input or cycle the V
LO
to the low voltage wire (wire with thinner insulation).
P
2
RODUCTION
inputs allow the user the flexibility to adjust the
HI
1
to high voltage wire from the lamp. Connect
and SET
LO
to circuit ground as this will defeat
2
D
(see Figure 2) inputs to select the
SLEEP
ATASHEET
LXMG1617A-05-6x
input.
IN
input supply.
LO
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