LXMG1626-12-45 MICROSEMI, LXMG1626-12-45 Datasheet - Page 5

• Manufacturer Part Number: LXMG1626-12-45
• Manufacturer: MICROSEMI

Specifications of LXMG1626-12-45

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

Copyright © 2007
Rev.1.1, 2007-08-24
* Under some conditions the second lamp will also shutdown, this is especially
Both Lamps Open
Normal Operation
Both Lamps High
Lamp(s) Status
One Lamp Open
One Lamp High
Side Short to
Side Short to
true if the inverter draws an arc going open or when shorted.
Ground
Ground
TM
0 < P . W . < 100 % of period
500K
Figure 1A – PWM Brightness Control
10 µs to 200 µS
Figure 2 – FAULT Output Operation
DAC or
Pot
PWM Signal
from System
(Output current set to maximum)
BRITE
SLEEP
Figure 1 – Brightness Control
SET
P
LXMG1626-12-45
.
BRITE
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
FAULT
W
FAULT
SET
NC
SLEEP
High
High
High
High
Low
.
LXMG1626-12-45
12V
FAULT
V
NC
IN
`
12V
V
GND
Normal @ ~½ lamp current*
Normal @ ~½ lamp current*
IN
Normal full lamp current
BRITE
Inverter Operation
GND
LXMG1626-12-45
V
V
V
HI2
HI1
LO
Shutdown
Shutdown
V
V
V
HI2
HI1
LO
T Y P I C A L A P P L I C A T I O N
Analog Mixed Signal Group
®
Microsemi
PanelMatch™ StayLit™
12V Dual 6W CCFL Programmable Inverter Module
other voltage source, a digital pot or 500k manual pot. The
inverter contains an internal 215k pull-up to 3V to bias the
pot.
controller may also be used as shown in Figure 1A.
to TTL logic signal to the
lamps. Connect V
(wire with thinner insulation). Never connect V
ground as this will defeat lamp current regulation.
current. Generally the best lamp lifetime correlates with
driving the CCFL at the manufacture’s nominal current
setting.
intentionally left open.
driven, using an open collector, or open drain logic signal.
This will allow dynamic adjustment of 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
illumination and lower brightness (minimum or typical
output current) at nighttime. Since the dimming ratio is a
factor of both the burst duty cycle and the peak output
current, by using this technique the effective dim ratio can
be increased greater than what the burst duty cycle alone
could provide. Conversely, the SET input could be used to
overdrive the lamp current.
degradation of lamp life from such practices is the user’s
responsibility since not all lamps are designed to be under
or overdriven.
Input connector (CN1-8) FAULT signal which is normally
low will toggle high to indicate that an output fault
condition has occurred as summarized in the table to the left
figure 2. FAULT will toggle high if one or both lamps are
open or short circuited. If only one lamp opens, or its high
side is shorted to ground then the other lamp should
continue to operate with the FAULT signal going high.
both lamps open and/or both lamps are shorted the FAULT
will toggle high if it is not already high and the inverter
output will shutdown. Also if either low side connection of
the lamps is shorted to ground, or the lamps are shorted
high side to low side, FAULT will go high and the inverter
will shutdown. In order to restart the inverter after a fault, it
is necessary to toggle the
input supply. In fault induced shutdown mode the inverter
will draw about 15mA from V
The brightness control may be a voltage output DAC or
If you need to turn the inverter ON/OFF remotely, connect
Connect V
Use the SET input to program the desired maximum output
Typically the SET pin is permanently wired to ground or
A 3.3V Logic Level PWM signal from a micro-
P
RODUCTION
HI1
(maximum
and V
LO
HI2
to the low voltage wire lamp return
D
SLEEP
However it can also be actively
output
to high voltage wires from the
ATASHEET
SLEEP
IN
LXMG1626-12-45
supply.
Of course, any possible
input.
current)
input or cycle the V
for
LO
to circuit
daytime
IN
If
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