LXMG1626-12-64 MICROSEMI, LXMG1626-12-64 Datasheet - Page 5

• Manufacturer Part Number: LXMG1626-12-64
• Description: CCFL Inverter Dual Lamp 4.4W 65KHz 12-Pin
• Manufacturer: MICROSEMI

Specifications of LXMG1626-12-64

• Number Of Lamps: 2
• Typical Input Voltage: 12 V
• Typical Lamp Start Voltage: 1650 Vrms
• Typical Lamp Operating Voltage: 1100 Vrms
• Maximum Dimming: 100:1(Typ)
• Operating Temperature: -20 to 70 °C
• Operating Temperature Classification: Commercial
• Pin Count: 12
• Lead Free Status / Rohs Status: Compliant

Copyright © 2005
Rev. 1.0a, 2006-11-16
TM
500K
0 < P.W. < 100% of period
DAC or
Pot
Figure 1A – PWM Brightness Control
from System
PWM Signal
(Output current set to maximum)
10µs to 20µS
Figure 2 – Max Output Current
Figure 1 – Brightness Control
BRITE
SLEEP
SET
(SET
H
H
L
L
BRITE
SET
NC
P.W.
SLEEP
1
L=GND; H=Open
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
LXMG1626-12-64
1
1
LXMG1626-12-64
SET
and SET
H
H
L
L
SET
NC
12V
2
V
IN1
12V
V
2
IN1
3.5mA
4.0mA
4.5mA
5.0mA
GND
BRITE
2
LXMG1626-12-64
GND
Inputs)
RMS
RMS
RMS
RMS
V
V
LO
HI
V
V
LO
ONE OF
HI
TWO
T Y P I C A L A P P L I C A T I O N
CCFL
TUBE
ONE OF
TWO
CCFL
TUBE
Integrated Products
®
Microsemi
PanelMatch™
12V Dual 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. 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 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.
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 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 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 to
ground the inverter will attempt to strike the lamp for
number of cycles. After about 800 milliseconds without
success the inverter will shutdown. 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).
IN1
P
input supply
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
input.
LXMG1626-12-64
LO
Page 5
1
.