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PDF LXM1620-01 Data sheet ( Hoja de datos )
| Número de pieza | LXM1620-01 | |
| Descripción | DIRECT DRIVE DUAL LAMP CCFL INVERTER MODULE | |
| Fabricantes | Microsemi Corporation | |
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T H E I N F I N I T E P O W E R O F I N N O VAT I O N
LXM1620-01
DIRECT DRIVE DUAL LAMP CCFL INVERTER MODULE
PRELIMINARY DATA SHEET
DESCRIPTION
The Dual Output Module Ideal for
Desktop and Industrial Applications. The
LXM1620 Direct DriveTM Cold Cathode Fluo-
rescent Lamp (CCFL) Inverter is a single mod-
ule designed to drive two lamps and is targeted
for use with desktop Liquid Crystal Display
(LCD) and industrial LCD panels typically rang-
ing in size from 10.4-inches to 17-inches. This
two output inverter is the ideal solution to power
virtually any two lamp application.
Direct Drive Technology. The module de-
sign is based on a new patented1 Direct Drive
topology, which provides a number of cost and
performance advantages. The LXM1620-01
Direct Drive inverters eliminate the classic reso-
nant inductor and capacitors, thus reducing cost
and allowing a substantial reduction in module
size.
Fixed-Frequency Operation. Other ben-
efits of this new topology are fixed-frequency
operation and secondary-side strike-voltage
regulation. Strike-voltage regulation minimizes
corona discharge in the output transformer and
related circuitry, providing longer life and higher
reliability.
Fail-safe Feature For Multiple Lamp Ap-
plications. Our multi-output inverters are de-
signed 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.
Dual Module Uses Standard Power
Supply. The LXM1620 module uses a standard
12V ±10% input supply. It also ensures nomi-
nal power consumption with 2 lamps requiring
only 8 watts. Lamp current is fully regulated
with respect to input voltage and output imped-
ance variations.
Dimming Features. The LXM1620 mod-
ules are equipped with a dimming input that per-
mits brightness control from an external poten-
tiometer or DC voltage. In addition, the sleep
input reduces module power to a few microwatts
in shut down mode. All LXM1620 modules fea-
ture both output open and short-circuit protec-
tion. The Most Efficient and
Cost-effective Backlight Inverter for Desk-
top/Industrial Applications. Linfinity's pro-
prietary Direct Drive architecture is the highest
efficiency, small form factor solution for all
multiple lamp applications. The LXM1620 is
fully customizable (electronically and mechani-
cally) to specific customer requirements.
1 US Patent Numbers: 5923129 & 5930121
NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.
KEY FEATURES
s Drive Two Lamps With One Module
s Small, Compact Size
s High Efficiency
s Multiple Outputs Provide Easy LCD
Connections
s Low EMI And Noise
s Low Power Sleep Mode
s Output Short And Open Circuit Protection
s 3:1 Dimming Control
s Adjustable Lamp Current Up To 6.0mA Per
Lamp
s Long Lamp Life With Soft-Start And
Accurate Lamp Current Regulation
A P P L I C AT I O N S
s Desktop LCD Monitors And Panels
s Industrial LCD Panels
s Hi-Brite Displays
BENEFITS
s Cool Operation
s Smooth, Easy-To-Use Brightness Control
s Single 12 Volt Supply
PRODUCT HIGHLIGHT
LXM1620 "UNIVERSAL" MODULE CONNECTION OPTIONS
Dual Connector Configuration
Single Connector Configuration
CN2 CCFL Lamp
CN2
CCFL Lamps
CN3 CCFL Lamp
CN3
Desktop Display
Desktop Display
MODULE ORDER INFORMATION
Part Number
Lamp Run Voltage
Lamp Current
LXM1620-01
500 - 750VRMS
6mA
Copyright © 2000
Rev. 0.9 10/00
LINFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1
1 page  
PRODUCT DATABOOK 1996/1997
DIRECT DRIVE DUAL LAMP CCFL INVERTER MODULE
PRELIMINARY DATA SHEET
LXM1620-01
DIRECT DRIVE OUTPUT ARCHITECTURE
Direct Drive architecture includes two load feedback control loops to
provide uncompromised CCFL ignition and operation characteristics.
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 LX1620 analog dimming inverters is typically 6:1
when driving dual 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 (VSNS) takes control and regulates output voltage to
1650VRMS. This insures the lamp will ignite under worst case temperature
and aging conditions.
Because output voltage is actively regulated, it will never exceed
componentandpanelinsulationratings. Thispreventsdestructivecorona
discharge to insure long term reliability of the system.
SLEEP
BRITE
Controller
High Voltage
Transformer
Transformer
Driver
VHI1
GND
VSENSE
ISENSE
VLO
FIGURE 3 — LXM1620 Block Diagram
(Only one lamp shown)
5.0VDC
TYPICAL APPLICATIONS
10.8VDC- 16VDC
£ 10k
5V
0V
BRITE
VIN
LXM1620-xx
VHI2
VHI1
SLEEP
GND
VLO
FIGURE 4 — Potentiometer Brightness Control
Copyright © 2000
Rev. 0.9 10/00
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.
5
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