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PDF LXMG1626-05-67 Data sheet ( Hoja de datos )
| Número de pieza | LXMG1626-05-67 | |
| Descripción | CCFL Programmable Inverter Module | |
| Fabricantes | Microsemi Corporation | |
| Logotipo |  |
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PanelMatch™
LXMG1626-05-67
® 5V 10W Dual CCFL Programmable Inverter Module
TM
PRODUCTION DATASHEET
DESCRIPTION
The LXMG1626-05-67 is a 10W dual wide range (typically 100:1+) dimming
Output Direct Drive™ CCFL (Cold Cathode application.
wwwF.lDuaotareShsceeetn4Ut .net Lamp) Inverter Module
The resultant “burst drive” that
specifically designed to be compatible with a energizes the lamp is designed specifically
variety of LCD panels that have both lamps to ensure that no premature lamp
on one side of the panel and use a single degradation occurs, while allowing
common lamp return wire.
significant power savings at lower dim
LXMG1626 modules provide the levels.
designer with a vastly superior display The modules convert DC voltage from
brightness range. This brightness range is the system battery or AC adapter directly to
achievable with virtually any LCD display. high frequency, high-voltage waves
The modules are available with a required to ignite and operate CCFL lamps.
dimming input that permits brightness The modules design utilizes
control from either: a DC voltage source, Microsemi’s LX1691B backlight con-
a PWM signal, or external Potentiometer. troller, which provides a number of cost and
The maximum output current is performance advantages due to the
externally programmable (through the input controller’s high level of integration. A
connector) over a range of 10 to 14mA in 12V input supply version (LXMG1626-12-
steps. This allows the inverter to match the 67) is also available.
panel’s lamp current specifications or it can Other benefits of this new topology
be used to purposely drive the lamps at a include: stable fixed-frequency operation,
lower or higher current to decrease or secondary-side strike-voltage regulation and
increase nominal brightness.
both open / shorted lamp protection with
RangeMAX™ Digital Dimming Technique fault timeout.
provides flicker-free brightness control in any
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
Protected By U.S. Patents: 5,923,129; 5,930,121; 6,198,234; Patents Pending
PRODUCT HIGHLIGHT
KEY FEATURES
Externally Programmable
Maximum Output Current
Easy to Use Brightness Control
RangeMAX™ Wide Range
Dimming
Output Open & Short-Circuit
Protection and Automatic Strike-
Voltage Regulation and Timeout
Fixed Frequency Operation
Rated From -20 to 70°C
UL60950 E175910
RoHS Compliant
APPLICATIONS
Dual Lamp LCD’s Requiring a
Shared Common Lamp Return
Mates to a Single JST BHR-
04VS-1 Lamp Connector
Desktop Displays
Industrial Display Controls
BENEFITS
Smooth, Flicker Free 1%-100%
Full-Range Brightness Control
Programmable Output Current
Allows Inverter to Mate With a
Wide Variety of LCD Panel’s
Specifications
Output Open Circuit Voltage
Regulation Minimizes Corona
Discharge For High Reliability
DC Voltage
Source
Potentiometer
PWM
Signal
Microsemi
W
UNIVERSAL DIMMING INPUT
"PWM", VDC, OR POTENTIOMETER
Lamp Current 10 to 14mA in Steps
PART NUMBER
LXMG1626-05-67
PACKAGE ORDER INFO
OUTPUT CONNECTOR
JST SM04(4.0)B-BHS-1-TB(LF)(SN) or Yeon Ho 20015WR-07A00
INVERTER MATES DIRECTLY TO
PANEL CONNECTORS
JST BHR-04VS-1
Copyright © 2005
Rev. 1.0, 2007-01-04
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
1 page  
PanelMatch™
LXMG1626-05-67
® 5V 10W Dual CCFL Programmable Inverter Module
TM
PRODUCTION DATASHEET
TYPICAL APPLICATION
DAC or
Pot BRITE
5V
VIN1
VHI1
500K
LXMG1626-05-67
VHI2
SLEEP
SET1 SET2
NC NC
VLO
GND
Figure 1 – Brightness Control
(Output current set to maximum)
PWM Signal
from System
BRITE
P.W.
5µs to 100µS
0 < P.W. < 100% of period
LXMG1626-05-67
Figure 1A – PWM Brightness Control
5V
BRITE
VIN1
VHI1
VHI2
LXMG1626-05-67
SLEEP
SET1 SET2
GND VLO
L L 10.0mARMS
L H 11.5mARMS
H L 12.8mARMS
H H 14.0mARMS
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 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 SLEEP input.
Connect VHI1 and VHI2 to high voltage wires from the
lamps. Connect VLO to the low voltage wire lamp return
(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 manufacturers. Generally the best
lamp lifetime correlates with driving the CCFL at the
manufacturer’s 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 an 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 both
outputs are open (lamps disconnected or broken) or shorted
to ground the inverter will attempt to strike the lamp for a
number of cycles. After about one to two 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
Copyright © 2005
Rev. 1.0, 2007-01-04
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
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| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet LXMG1626-05-67.PDF ] | |
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