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PDF LXMG1626-12-46 Data sheet ( Hoja de datos )
| Número de pieza | LXMG1626-12-46 | |
| Descripción | CCFL Programmable Inverter Module | |
| Fabricantes | Microsemi Corporation | |
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PanelMatch™ StayLIT™ LXMG1626-12-46
TM ® 12V Dual 6W CCFL Programmable Inverter Module
PRODUCTION DATASHEET
DESCRIPTION
The LXMG1626-12-46 is a Dual 6W In addition when only one of the two
Output Direct Drive™ CCFL (Cold lamps in the LCD fails open, the second
wwwC.DatahtaoSdheeet4UF.nleutorescent Lamp) Inverter lamp will continue to operate with a
Module specifically designed to be FAULT signal toggling to indicate the
compatible with variety of LCD panels failed condition, StayLit™feature.
that have both lamps on one side of the RangeMAX Digital Dimming
panel and use a single common lamp Technique provides flicker-free
return wire.
brightness control in any wide range
LXMG1626 modules provide the typically (100:1+) dimming application.
designer with a superior display brightness The resultant “burst drive” that
range. This brightness range is achievable energizes the lamp is designed
with virtually any LCD display.
specifically to ensure that no premature
The modules are available with a lamp degradation occurs, while allowing
dimming input that permits brightness significant power savings at lower dim
control from either, a DC voltage source, levels.
a PWM signal or external potentiometer.
The design utilizes Microsemi’s
The maximum output current is highly integrated LX1691B backlight
externally programmable (through the controller to convert DC voltage from the
input connector) at either 10mA or 12mA system battery or AC adapter directly to
(5mA or 6mA per lamp). This allows the high frequency, high-voltage waves
inverter to match the panel’s lamp current required to ignite and operate CCFL
specifications, or it can be used to lamps.
purposely drive the lamps at a lower or Other benefits of this new topology
higher current to decrease or increase are stable fixed-frequency operation,
nominal brightness. The inverter also has secondary-side strike-voltage regulation
a dedicated FAULT pin that indicates an and both open/shorted lamp protection
open/shorted lamp condition.
with fault timeout.
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
StayLit™ Continued Operation
with Single Open Lamp Failure
Fixed Frequency Operation
Fault Output Signal
Rated From -30°C to 80°C
RoHS Compliant
UL60950 E175910
APPLICATIONS
Dual lamp LCD’s Requiring a
Shared Common Lamp Return
Mates to a Single JST BHR-04
VS-1 Lamp Connector
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
Lamp
Fault
Signal
Microsemi
UNIVERSAL DIMMING INPUT
"PWM", VDC, OR POTENTIOMETER
Lamp current 5 or 6mA per Lamp
W
PART NUMBER
LXMG1626-12-46
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 © 2007
Rev. 1.1, 2007-08-24
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
1 page  
PanelMatch™ StayLIT™ LXMG1626-12-46
TM ® 12V Dual 6W CCFL Programmable Inverter Module
PRODUCTION DATASHEET
TYPICAL APPLICATION
DAC or
Pot BRITE
12V
VIN
VHI1
500K
LXMG1626-12-46
VHI2
SLEEP
SET FAULT
`
NC NC
VLO
GND
Figure 1 – Brightness Control
(Output current set to maximum)
PWM Signal
from System
BRITE
P.W.
10 µs to 200 µS
LXMG1626-12-46
0 < P . W . < 100 % of period
Figure 1A – PWM Brightness Control
12V
BRITE
VIN
VHI1
VHI2
LXMG1626-12-46
SLEEP
SET FAULT GND VLO
Lamp(s) Status FAULT
Inverter Operation
Normal Operation
One Lamp Open
Both Lamps Open
One Lamp High
Side Short to
Ground
Both Lamps High
Side Short to
Ground
Low
High
High
High
High
Normal full lamp current
Normal @ ~½ lamp
current*
Shutdown
Normal @ ~½ lamp
current*
Shutdown
Figure 2 – FAULT Output Operation
* Under some conditions the second lamp will also shutdown, this is especially true
if the inverter draws an arc going open or when shorted.
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.
Use the SET input to program the desired maximum output
current. Generally the best lamp lifetime correlates with
driving the CCFL at the manufacture’s nominal current
setting.
Typically the SET pin is permanently wired to ground or
intentionally left open. However it can also be actively
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 (maximum output current) for daytime
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. Of course, any possible
degradation of lamp life from such practices is the user’s
responsibility since not all lamps are designed to be under
or overdriven.
Input connector (CN1-8) FAULT signal which is normally
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. If both lamps
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 VIN input
supply. In fault induced shutdown mode the inverter will
draw about 15mA from VIN supply.
Copyright © 2007
Rev. 1.1, 2007-08-24
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
5 Page | ||
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| PDF Descargar | [ Datasheet LXMG1626-12-46.PDF ] | |
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