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LXM1621-02 View Datasheet(PDF) - Microsemi Corporation

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LXM1621-02
Microsemi
Microsemi Corporation Microsemi
LXM1621-02 Datasheet PDF : 11 Pages
1 2 3 4 5 6 7 8 9 10
INTEGRATED PRODUCTS
RangeMAX
LXM1621-xx
DIGITAL DIMMING DUAL LAMP CCFL INVERTER MODULE
PRELIMINARY DATA SHEET
HOW THE RANGEMAX WORKS (CONTINUED)
HIGHLIGHTS (CONTINUED)
In applications with no access to a vertical sync, the
inverter burst frequency can be allowed to “free run” at
95Hz. In this non-synchronous mode, minor display
disturbances may be found under certain video conditions.
This performance is acceptable for many applications, but
synchronization must be used when no disturbance can be
tolerated.
Separate feedback loops for lamp current and open circuit
voltage regulation insure reliable strike under all operating
conditions, automatic over-voltage prevention with broken
or failed lamps, and accurate lamp current regulation.
TYPICAL APPLICATION
12V
2.5VDC
< 10k
BRITE VIN
VHI2
VHI1
LXM1621-xx
0 5V SLEEP
VSYNC GND
VLO
VSYNC
Figure 7- Brightness Control
PWM Signal 4.99k
from System
4.99k*
P.W.
BRITE
4.7µF
LXM1621-xx
< 100µs
0 < P.W. < 100% of period
* use 4.99k for 5V PWM amplitude, 15k for 3.3V PWM
amplitude, and omit for 2.5V PWM amplitute.
Figure 8 - PWM Brightness Control
The brightness control may be a simple 10k potentiometer
or a voltage output DAC. A PWM signal from a micro-
controller may also be used with a suitable filter such as
shown in figure 8.
If synchronization to the video frame rate is desired,
connect the vertical sync pulse from the system video
controller to the appropriate VSYNC input. If no video
synchronization is desired, connect VSYNC to ground.
If you need to turn the inverter ON/OFF remotely, connect
a 3V or 5V logic signal to the SLEEP input. If remote
ON/OFF is not needed, connect the SLEEP input to VIN or
any other voltage greater than 2.2VDC.
Connect VHI to high voltage wire from the lamp. Connect
VLO to the low voltage wire (wire with thinner insulation).
If both lamp wires have heavy high voltage insulation,
connect the longest wire to VLO. VLO is connected directly
to ground (GND pin) on the inverter PCB. Always insure
a good lamp return by using a wire. Do not rely on a
chassis ground connection.
RangeMAX INVERTERS
Also available in single lamp inverters are the
LXM1612-xx-xx or LXM1615-xx-xx, as well as the
12V dual lamp LXM1621-12-xx, LXM1622-xx-xx, and
the Quad output LXM1641-01 versions for multiple
lamp applications.
Copyright 2000
Rev. 0.8, 2003-08-28
Microsemi
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 8
 

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