LXMG1626-05-66 MICROSEMI, LXMG1626-05-66 Datasheet - Page 5

• Manufacturer Part Number: LXMG1626-05-66
• Manufacturer: MICROSEMI

Specifications of LXMG1626-05-66

• Operating Temperature Classification: Commercial
• Pin Count: 12
• Lead Free Status / Rohs Status: Compliant

Copyright © 2005
Rev. 1.0, 2006-11-16
0 < P.W. < 100 % of period
TM
500K
DAC or
Pot
Figure 1A – PWM Brightness Control
10 µs to 20µS period
from System
PWM Signal
(Output current set to maximum)
Figure 2 – Max Output Current
Figure 1 – Brightness Control
BRITE
SLEEP
SET
(SET
H
H
L
L
P.W.
BRITE
SET
1
NC
SLEEP
L=GND; H=Open
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
LXMG1626-05-66
1
1
SET
LXMG1626-05-66
and SET
H
H
L
L
SET
NC
2
V
5V
IN1
V
2
10.0mA
11.5mA
12.8mA
14.0mA
5V
IN1
BRITE
2
LXMG1626-05-66
GND
Inputs)
GND
RMS
RMS
RMS
RMS
V
V
V
V
V
V
HI1
HI2
LO
HI1
HI2
LO
T Y P I C A L A P P L I C A T I O N
Integrated Products
®
Microsemi
PanelMatch™
5V 10W Dual 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. 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
lamps. Connect V
(wire with thinner insulation).
circuit ground as this will defeat lamp current regulation.
If both lamp wires have heavy high voltage insulation,
connect the longest wire to V
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
manufacturer’s nominal current setting.
SET
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 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 both
outputs are open (lamps disconnected or broken) or shorted
to ground the inverter will attempt to strike the lamp for a
number of cycles. After about one to two 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
1
IN1
and SET
P
input supply
RODUCTION
HI1
1
and SET
and V
2
inputs allow the user the flexibility to
LO
HI2
to the low voltage wire lamp return
2
D
(see Figure 2) inputs to select the
to high voltage wires from the
SLEEP
ATASHEET
LO
LXMG1626-05-66
input.
. This wire is typically
Never connect V
However the
LO
to
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