lx1688 Microsemi Corporation, lx1688 Datasheet - Page 12

• Manufacturer Part Number: lx1688
• Description: Multiple Lamp Ccfl Controller
• Manufacturer: Microsemi Corporation

Copyright © 2001
Rev. 1.2, 2006-03-09
duty cycle. As shown all signals are synchronized. The difference between each signal’s duty cycles is because each lamp has
an independent control loop.
Output Drivers
The figure 4 shows the gate signals of the modules, which are operating, in running mode during digital dimming with 95%
and RMP_RST) timing relationship to Gate signal
AOUT, for the
PHA_SYNC running at the same frequency and
RMP_RST signal has the twice frequency.
Multiple Lamp Sync
The figure 3 shows the sync signals (PHA_SYNC
Figure 3-
TM
Sync signals-Timing relationship to A
CH2= A
CH4=RMP_RST
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
master
OUT
(Master), CH3=PHA_SYNC,
module. AOUT and
T H E O R Y O F O P E R A T I O N
Integrated Products Division
OUT
®
Microsemi
RangeMAX™
operates from the primary oscillator; therefore the strike
controller is independent of the sync signals. The
following oscilloscope waveform picture is taken when
the master module is on striking mode and the salves are
on running mode.
Strike Mode
Every IC includes a separate strike controller that
Multiple Lamp CCFL Controller
Figure 4-
Figure 5-
P
RODUCTION
Output drivers of both Master
and Slaves.
CH2=A
CH3=A
CH4=A
are in running mode CH2=
A
CH4=A
Master is in striking mode while slaves
OUT
OUT
OUT
OUT
(Master), CH3=A
OUT
(Master),
(Slave1),
(Slave2)
D
(Slave2)
ATA
S
HEET
OUT
(Slave1),
LX1688
Page 12