LXM1612-05-03 View Datasheet(PDF) - Microsemi Corporation
Part Name
Description
Manufacturer
LXM1612-05-03 Datasheet PDF : 6 Pages
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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
BRITE
V IN1
VHI
10k
LXM1612-05-xx
R
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 C10
R16
R10
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
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