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PDF LXM1612-05-XX Data sheet ( Hoja de datos )
| Número de pieza | LXM1612-05-XX | |
| Descripción | 5V Highly-Integrated/ Digital Dimming CCFL Inverter Module | |
| Fabricantes | Microsemi Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LXM1612-05-XX (archivo pdf) en la parte inferior de esta página. Total 6 Páginas | ||
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A MICROSEMI COMPANY
LXM1612-05-xx
5V Highly-Integrated, Digital Dimming CCFL Inverter Module
PRELIMINARY DATASHEET
RangeMAX Wide Range Dimming,
Single Output Inverter. The LXM1612-
05-xx series of Direct Drive™ CCFL
(Cold Cathode Fluorescent Lamp)
Inverter Modules are specifically
designed for driving LCD backlight
lamps.
RangeMAX Digital Dimming
Technique. Digital Dimming provides
flicker-free brightness control in any
wide-range dimming application.
The modules are equipped with a
dimming input that permits brightness
control from either an external
potentiometer, DC voltage source, or
PWM signal. The resultant “burst drive”
that energizes the lamp was designed
specifically to ensure that no premature
lamp degradation occurs.
Input Voltage Range. The modules
convert DC voltage from the system
battery or AC adapter directly to high-
frequency, high-voltage waves required
to ignite and operate CCFL lamps. A
12V input inverter is also available
(LXM1612-12-xx)
Direct Drive Technology. The
module design is based on a new Direct
Drive topology, which provides a
number of cost and performance
advantages.
Additional Features. Other benefits of
this new topology are fixed-frequency
operation and secondary-side strike-
voltage regulation and all LXM1612-05-
xx modules feature both open and
shorted lamp protection.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
DC Voltage
Source
Potentiom eter
PW M
Signal
BRITE
RangeMAX Wide Range
Dimming
Single 5V Input Voltage
Fully Integrated Direct Drive
And Dimming Control
Single Sided PCB Layout
Easy To Use Brightness
Control
MicroAmp SLEEP Mode
Output Short-Circuit
Protection And Automatic
Strike-Voltage Regulation
Fixed Frequency Operation
Notebook And Sub-Notebook
Computers
Portable Instrumentation
Desktop Displays
Low Ambient Light
Conditions (i.e. Aircraft
Cabins, Automobile)
Smooth, Flicker Free 1-100%
Full-Range Brightness
Control Gives Your Product
A High Quality Image
Output Open Circuit Voltage
Regulation Minimizes Corona
Discharge For Long Life And
High Reliability
Power Efficient. “Low
Brightness” Capability Allows
For Advanced Power
Management
PART NUMBER
LXM1612-05-01
LXM1612-05-02
LXM1612-05-03
OUTPUT CONNECTOR
JST SM02(8.0)B-BHS-1-TB
JST SM02B-BHSS-1-TB
Honda QZ-19-A3MYL #02
INVERTER MATES DIRECTLY
TO PANEL CONNECTORS
BHR-03VS-1
BHSR-02VS-1
QZ-19-3F01
Copyright © 2000
Rev. 0.5e, 2000-12-06
Microsemi
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
1 page  
A MICROSEMI COMPANY
LXM1612-05-xx
5V Highly-Integrated, Digital Dimming CCFL Inverter Module
PRELIMINARY DATASHEET
Integrated brightness control circuit includes a DC voltage In applications with no access to a vertical sync., an onboard
to pulse width converter that minimizes system design
oscillator operates the inverter burst rate at about 250Hz. In
work and system noise susceptibility. This provides a
this non-synchronous mode, minor display disturbances can
familiar and convenient interface while reducing the
be found under certain video conditions. This performance
potential for externally induced noise, which can cause
may be acceptable for many applications, but
lamp flicker.
synchronization must be used when no disturbance can be
RangeMAX inverter modules are designed to operate with
tolerated.
the burst frequency synchronized to the video frame rate. A single input will accommodate negative and positive
This provides operation with no visible display
vertical sync pulses at any pulse width.
disturbances caused by beat frequencies between the lamps Separate feedback loops for lamp current and open circuit
and video frame rates. In this synchronous mode, the
voltage regulation insure reliable strike under all operating
inverter burst rate operates at twice the video refresh rate,
conditions, automatic over-voltage prevention with broken
well beyond standard 50/60Hz video refresh rates where
or failed lamps, and accurate lamp current regulation.
the eye can perceive pulsing light.
5V
DAC or
Pot
10k
R
BRITE
V IN1
LXM1612-05-xx
VHI
5V
BRITE RTN
SLEEP VSYNC
VLO
GND
0V
V SYN C
CCFL
TUBE
Figure 5 - Potentiometer Brightness Control
PW M Signal
from System
BRITE
P.W .
2ms
LXM1612-05-xx
0 < P.W. < 100% of perio d
Figure 5A - PW M Brightness Control
The brightness control may be a voltage output DAC, digital
resistor or a simple 10k potentiometer. If desired, an
additional series resistor with the 10k potentiometer can be
used to set a higher minimum brightness setting as shown in
Figure 5. A 2.5V to 5V Logic Level PWM signal from a
micro-controller may also be used as shown in Figure 5A.
If synchronization to the video frame rate is desired, connect
the vertical sync pulse from the system video controller to
the VSYNC input. If no video synchronization is desired,
connect VSYNC to ground.
If you need to turn the inverter ON/OFF remotely, connect
to 2.5V to 5V logic signal to the SLEEPinput.
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.
!
The LXM1612-05 output current can be adjusted by changing the
value of two resistors on the PCB. The following table shows the
approximate new output current values:
Output Current
7.0mA
6.0mA
5.8mA
5.0mA
4.0mA
3.0mA
R12
2.00K 1%
2.61K 1%
2.74K 1%
2.74K 1%
2.74K 1%
2.74K 1%
R16
Not Used
Not Used
Not Used
499K 1%
178K 1%
78.7K 1%
R30
U4
R21
C7
R20
R41
R33 R34
R4 R3
C3
C4
R2
C5
C21
R38
R39
C6 C8
R5
R6
C9
C2
U1
R7 R15
C11 R12 R14
C15
C16
C12
R11
C14
C13
R16
R10
C10
R13
-
Component Replacement Locations
Copyright © 2000
Rev. 0.5e, 2000-12-06
Microsemi
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
5 Page | ||
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