LX1688C 데이터 시트보기 (PDF) - Microsemi Corporation

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LX1688C

Multiple Lamp CCFL Controller

Microsemi Corporation 

RangeMAX™

LX1688

TM

®

Multiple Lamp CCFL Controller

PRODUCTION DATA SHEET

THEORY OF OPERATION

Multiple Lamp Sync

The figure 3 shows the sync signals (PHA_SYNC

and RMP_RST) timing relationship to Gate signal

AOUT, for the master module. AOUT and

PHA_SYNC running at the same frequency and

RMP_RST signal has the twice frequency.

Strike Mode

Every IC includes a separate strike controller that

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.

Figure 3- Sync signals-Timing relationship to AOUT

CH2= AOUT(Master), CH3=PHA_SYNC,

CH4=RMP_RST

Figure 5- Master is in striking mode while slaves

are in running mode CH2=

AOUT(Master), CH3=AOUT(Slave1),

CH4=AOUT(Slave2)

Output Drivers

The figure 4 shows the gate signals of the modules, which are operating, in running mode during digital dimming with 95%

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.

Figure 4- Output drivers of both Master

and Slaves.

CH2=AOUT(Master),

CH3=AOUT(Slave1),

CH4=AOUT(Slave2)

Copyright © 2001

Rev. 1.2, 2006-03-09

Microsemi

Integrated Products Division

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

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