
DIGITAL DIMMING DUAL LAMP CCFL INVERTER MODULE
LXM1621-xx
PRODUCT DA T ABOOK 1996/1997
5
Copyright 1999
Rev. 0.5 11/99
P RELIMINAR Y D ATA S HEET
P A TENT P ENDING
RangeMAXTM
CONNECTOR SCHEMA TIC
CN2
CN3
CN1
4
3
2
1
2
3
CN4
N.C.
3
2
1
CN5
1
2
3
4
N.C.
Inverter
Output
1
Inverter
Output
2
81
V
HI2
V
HI1
FIGURE 2 — LXM1621-01 Connector Schematic
Note: CN2 and CN3 (shown with dashed lines) are located on the opposite side of the PCB from CN1, CN4
and CN5. Their pin numbers are shown as viewed looking through the printed circuit board.
Connectors:
Mates With:
CN1 = MOLEX 53261-0890
Pins: 50079-8100*, Housing: 51021-0800
* Loose (-8000, Chain) Recommended #26 AWG wiring
CN2, CN3 = JST SM04(4.0)B-BHS-1-TB
JST BHR-04VS-1
CN4, CN5 = JST SM03(4.0)B-BHS-1-TB
JST BHR-03VS-1
Connection Rules
1. Always install two (2) lamps. Operating with only one lamp may overdrive lamp current at maximum brightness settings.
2. Verify lamp wiring before connecting lamps to the inverter module. Connecting both lamps to one of the two inverter output circuits
will result in reduced brightness. The LXM1621-01 module connectors are wired per industry standard. The lamp hot wires (high
voltage wires) are always on pin 1 or 2, and the cold wire (low voltage wire) is always on pin 3 or 4.
F AILSAFE FEATURE FOR MUL TIPLE LAMP OPERATIONS
Our multi-output inverters are designed to keep your application
operating at near normal brightness in the event that a lamp fails.
This allows the display to remain "on-line" until lamp replacement
is convenient.
Linfinity "pairs" the lamps so that if one lamp in the pair breaks,
most of its current is added to the good lamp. CCFLs will respond
with more brightness for a period of time. Operating time in this
mode will be a function of the lamps age but should be typically
in the order of hundreds of hours.
This operating characteristic can provide adequate display
performance for a limited, but useful period of time. Shortening
of the lamp life in this mode is typically not a concern as it is
recommended that all lamps in a display be replaced at the same
time.
FIGURE 3 — Dual Output Stage
I
S
Lamps