LXMG1626-12-46 Microsemi Analog Mixed Signal Group, LXMG1626-12-46 Datasheet - Page 5

• Manufacturer Part Number: LXMG1626-12-46
• Description: MOD INVERTER CCFL DUAL 6W 12V
• Manufacturer: Microsemi Analog Mixed Signal Group
• Series: PanelMatch™r
• Type: Inverters for CCFL and UV Lampsr

Specifications of LXMG1626-12-46

• Voltage - Input: 12V
• Output: 1500V
• Size / Dimension: 4.45" L x 1.18" W x 0.26" H (113mm x 30mm x 6.5mm)
• Mounting Type: Chassis Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Copyright © 2007
Rev. 1.1, 2007-08-24
* Under some conditions the second lamp will also shutdown, this is especially true
Both Lamps Open
Normal Operation
0 < P . W . < 100 % of period
Both Lamps High
Lamp(s) Status
One Lamp Open
One Lamp High
Side Short to
Side Short to
TM
Ground
Ground
10 µs to 200 µS
if the inverter draws an arc going open or when shorted.
PWM Signal
from System
500K
Figure 1A – PWM Brightness Control
Figure 2 – FAULT Output Operation
DAC or
Pot
(Output current set to maximum)
Figure 1 – Brightness Control
BRITE
SLEEP
SET
P
.
W
LXMG1626-12-46
BRITE
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
SET
NC
FAULT
.
FAULT
SLEEP
High
High
High
High
Low
LXMG1626-12-46
12V
FAULT
V
NC
IN
`
12V
V
GND
IN
Normal full lamp current
BRITE
Inverter Operation
Normal @ ~½ lamp
Normal @ ~½ lamp
GND
LXMG1626-12-46
V
V
V
HI1
HI2
LO
Shutdown
Shutdown
current*
current*
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.
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 shorts to ground then the other lamp should continue to
operate with the FAULT signal going high.
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 SLEEP input or cycle the V
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
Input connector (CN1-8) FAULT signal which is normally
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
IN
D
SLEEP
However it can also be actively
output
to high voltage wires from the
ATASHEET
supply.
Of course, any possible
input.
LXMG1626-12-46
current)
for
If both lamps
LO
to circuit
daytime
IN
input
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