|
|
PDF LXMG1644-12-61 Data sheet ( Hoja de datos )
| Número de pieza | LXMG1644-12-61 | |
| Descripción | CCFL Programmable Inverter Module | |
| Fabricantes | Microsemi Corporation | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de LXMG1644-12-61 (archivo pdf) en la parte inferior de esta página. Total 6 Páginas | ||
|
No Preview Available !
PanelMatch™
LXMG1644-12-61
TM ® 12V Quad 6W CCFL Programmable Inverter Module
PRODUCTION DATASHEET
DESCRIPTION
The LXMG1644-12-61 is a Quad 6W For applications not requiring wide
Output Direct Drive™ CCFL (Cold range dimming, amplitude control results
wwwC.DatahtaoSdheeet4UF.nleutorescent Lamp) Inverter in lower ripple on the input supply and
Module specifically designed for driving reduced potential transient noise
LCD backlight lamps. It is ideal for generation. Many STN type panels are
driving typical 12.1” to 18.1” TFT panels. particularly well suited for current
The modules are available with a amplitude dimming.
dimming input that permits brightness The modules convert DC voltage from
control from either a DC voltage source or the system battery or AC adapter directly
a PWM signal or external Potentiometer. to high frequency, high-voltage waves
The maximum output current is externally required to ignite and operate CCFL
programmable over a range of 10 to 16mA lamps.
in 1mA steps to allow the inverter to The LXMG1644-12-61 inverter is in-
properly match to a wide array of LCD tended for panel assemblies where lamp
panel lamp current specifications.
pairs share close proximity with one
LXMG1644 modules unlike the another and a common return (low side)
LXMG1643 series does not provide wide wire.
range ‘burst’ mode dimming, rather Other benefits of this new topology
dimming is provided by amplitude control are stable fixed-frequency operation,
of the output current waveform, this limits secondary-side strike-voltage regulation
the potential dim range to typically less and both open/shorted lamp protection
than 5:1.
with fault timeout.
IMPORTANT: For the most current data and a panel to inverter cross reference, consult MICROSEMI’s website:
http://www.microsemi.com
KEY FEATURES
Externally Programmable
Maximum Output Current
Easy to Use Brightness
Control
Analog Current Amplitude
Dimming Method
Output Open/Short-Circuit
Protection and Timeout
Fixed Frequency Operation
Rated From -20 to 70°C
UL 60950 E175910.
RoHS Compliant
APPLICATIONS
High Brightness Displays
Desktop Displays
Industrial Display Controls
BENEFITS
Compact, Low Profile
Design
Programmable output
current allows inverter to
mate with a wide variety of
LCD panel’s specifications
PRODUCT HIGHLIGHT
Universal Dimming Input PWM, VDC, or Potentiometer
DC
Voltage
Source
Potentiometer
PWM
Signal
Selectable Maximum Output Current 10mA to 16mARMS
W
PACKAGE ORDER INFO
ART NUMBER
OUTPUT CONNECTORS
INVERTER MATES DIRECTLY TO
PANEL CONNECTORS
LXMG1644-12-61 Two JST SM04(4.0)B-BHS-1-TB(LF)(SN) or Yeon Ho 20015WR-07A00
JST BHR-04VS-1
Copyright © 2002
Rev. 1.1, 2006-11-16
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
1 page  
PanelMatch™
LXMG1644-12-61
TM ® 12V Quad 6W CCFL Programmable Inverter Module
PRODUCTION DATASHEET
TYPICAL APPLICATION
DAC or
Pot
20K
RX*
BRITE
12V
VIN1
V Hx
V Hx
LXMG1644-12-61
SLEEP
SET1 SET2
NC NC
GND VLO
One
of
two
* Set RX from 2.7K to 3.9K depending on panel minimum lamp
current requirements
Figure 1 – Brightness Control
(Output current set to maximum)
PWM Signal
from System
BRITE
P.W.
10µs to 125µS
LXMG1644-12-61
26% < P.W. < 100% of period
Figure 1A – PWM Brightness Control
BRITE
12V
V IN1
LXMG1644-12-61
SLEEP
SET 1
SET 2
GND
One
of two
L L 10.0mARMS
L H 12.0mARMS
H L 14.0mARMS
H H 16.0mARMS
L=GND; H=Open
Figure 2 – Max Output Current (Two Lamps)
(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 1.8K to 3.9K 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 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 users
responsibility since not all lamps are designed to be
overdriven.
The inverter has a built in fault timeout function. If the
output return is open (lamp disconnected or broken) or
shorted the inverter will attempt to strike the lamp for
several seconds. After about a second 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. In the timeout shutdown mode input drain current
will be about 8mA.
Copyright © 2002
Rev. 1.1, 2006-11-16
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet LXMG1644-12-61.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| LXMG1644-12-61 | CCFL Programmable Inverter Module | Microsemi Corporation |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |