LXM1640-01 Ver la hoja de datos (PDF) - Microsemi Corporation
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LXM1640-01 Datasheet PDF : 5 Pages
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PRODUCT DATABOOK 1996/1997
DIRECT DRIVE QUAD LAMP CCFL INVERTER MODULE
PR E L I M I N A RY D ATA S H E E T
LXM1640-01
DIRECT DRIVE OUTPUT ARCHITECTURE
Direct Drive architecture includes two load feedback control loops
to provide uncompromised CCFL ignition and operation character-
istics.
Lamp current is regulated in the CCFL return lead (ISNS loop) to
insure constant light output with changing lamp parameters and
power supply voltage. This also allows accurate and repeatable
brightness control. Dimming ratio with the LX1640 analog dimming
inverters is typically 6:1 when driving quad LCD lamp panels.
If no current flows in the CCFL return path because of an
unstruck or failed lamp, the inverter applies full strike voltage
potential. The output voltage feedback loop (V ) takes control
SNS
and regulates output voltage to 1650VRMS. This insures lamps will
ignite under worst case temperature and aging conditions.
Because output voltage is actively regulated, it will never exceed
component and panel insulation ratings. This prevents destructive
corona discharge to insure long term reliability of the system.
High Voltage
Transformer
VHI1
SLEEP
BRITE
Controller
Transformer
Driver
GND
VSENSE
ISENSE
VLO
FIGURE 3 — LXM1640 Block Diagram
(Only one lamp shown)
5.0VDC
≤10k
5V
0V
TYPICAL APPLICATIONS
10.8VDC- 13.2VDC
VIN
VHI4
VHI3
BRITE
VHI2
VHI1
LXM1640-01
SLEEP
GND
VLO
FIGURE 4 — Potentiometer Brightness Control
PRELIMINARY DATA - Information contained in this document is pre-production data, and is proprietary to LinFinity. It may
not modified in any way without the express written consent of LinFinity. Product referred to herein is offered in sample form
only, and Linfinity reserves the right to change or discontinue this proposed product at any time.
Copyright © 1998
Rev. 0.4 5/98
5
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