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参数资料
| 型号： | LXM1618-12-61 |
| 厂商： | MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, XMA |
| 文件页数： | 5/6页 |
| 文件大小： | 188K |
| 代理商： | LXM1618-12-61 |
PRODUCTION DATASHEET
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
Copyright
2002
Rev. 1.0b, 2005-01-17
WWW
.Microse
m
i
.CO
M
PanelMatch
LXM1618-12-6x
12V 6W CCFL Programmable Inverter Module
I N TE G R A T E D
P R O D U C TS
TY PI CAL APPLI CATI O N
LXM1618-12-6x
12V
SET
2
GND
V
HI
V
LO
BRITE
V
IN1
SLEEP
SET
1
0.65V
to 2.0V
2.7K
20K
DAC or
Pot
CCFL
TUBE
NC
Figure 1
– Brightness Control
(Output current set to maximum)
P.W .
10s to 125S
BRITE
LXM1618-12-6x
~26% < P.W. < 100% of
period
PW M Signal
from System
Figure 1A
– PWM Brightness Control
LXM1618-12-6x
SET
2
GND
V
HI
V
LO
SLEEP
SET
1
CCFL
TUBE
BRITE
12V
V
IN1
L
5.0mARMS
L
H
6.0mARMS
H
L
7.0mARMS
H
8.0mARMS
L=GND; H=Open
Figure 2
– Max Output Current
(SET1 and SET2 Inputs)
The brightness control may be a voltage output DAC
or other voltage source, a digital pot or 20K manual pot.
The inverter contains an internal 10K pull-up to 3V to bias
the pot add a 2.7K resistor to set the lower threshold
voltage. 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
SLEEP input.
Connect VHI to high voltage wire from the lamp.
Connect VLO to the low voltage wire (wire with thinner
insulation). Never connect VLO to circuit ground as this
will defeat lamp current regulation.
If both lamp wires
have heavy high voltage insulation, connect the longest
wire to VLO. This wire is typically white.
Use the SET1 and SET2 (see Figure 2) inputs to select
the 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 SET1
and SET2 inputs allow the user the flexibility to 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 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 the peak output
current, using this technique the effective dim ratio can be
increased. 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 users
responsibility as 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 for
several seconds. After about 2 to 4 seconds without
success the inverter will shutdown. In order to restart the
inverter it is necessary to toggle the sleep input or cycle the
VIN1 input supply.
AA
PP
LL
IICC
AA
TT
IIOO
NN
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