LX1688 查看數據表（PDF） - Microsemi Corporation

零件编号

产品描述 (功能)

生产厂家

LX1688

Multiple Lamp CCFL Controller

Microsemi Corporation 

RangeMAX™

LX1688

TM

®

Multiple Lamp CCFL Controller

PRODUCTION DATA SHEET

THEORY OF OPERATION

Digital Dimming

The following oscilloscope waveforms are showing

gate signals of Master and slaves during digital dimming at

50% and 5% duty cycle.

Figure 6- Gate signals during digital dimming with

50% duty cycle CH2= AOUT(Master),

CH3=AOUT(Slave1), CH4=AOUT(Slave2)

Figure 7- Gate signals during digital dimming with

5% duty cycle CH2= AOUT(Master),

CH3=AOUT(Slave1), CH4=AOUT(Slave2)

Output currents

Figure 8 shows the output current of master and slaves during digital dimming with 5% duty cycle. The lamp currents are

operating in phase and frequency synchronization. This prevents random interface between controllers and reduces EMI.

Figure 8- Output current during

digital dimming with 5%

duty cycle R1= out(Master)

R2=Iout(Slave1)

R3=Iout(Slave2)

Lamp Current at 10mA/Div

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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