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PDF LXM1611-01 Data sheet ( Hoja de datos )
| Número de pieza | LXM1611-01 | |
| Descripción | DIGIT DIMMING 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
PATENTS PENDING
LIN D OC # : 1611
RangeMAXTM
LXM1611-01
DIGITAL DIMMING CCFL INVERTER MODULE
PRELIMINARY DATA SHEET
DESCRIPTION
RangeMAX Wide Range Dimming, Single
Output Inverter. The LXM1611 series of
Direct DriveTM CCFL (Cold Cathode Fluores-
cent Lamp) Inverter Modules are specifically
designed for driving LCD backlight lamps.
Similar to the LXM1610, the LXM1611 ex-
cels in applications where critical parameters
include very wide range dimmability, high
efficiency and reliable fail-safe design in a
small form factor.
Unlike the LXM1610 or any traditional
dimming CCFL inverters, the LXM1611 pro-
vides the designer a vastly superior display
brightness range. 100:1+ brightness range
is achievable with virtually any LCD display.
Our wide range dimming provides excep-
tional display readability at less than 1% of
full brightness, allowing both power savings
and low ambient light operating capability
(i.e. "night readable").
The LXM1611 is recommended for use in
panels with low-voltage insulation on the
lamp return wire.
RangeMAX Digital Dimming Tech-
nique. Digital dimming provides flicker-
free brightness control in any wide-range
dimming application. Dimming ratios greater
than 100:1 can be achieved. Incorporation
of a video synchronization feature allows
wide ratio dimming without the display dis-
turbances and interference seen with com-
petitive products.
The modules are equipped with a dimming
input that permits brightness control from an
external potentiometer or DC voltage source.
The resultant "burst drive" that energizes the
lamp was designed specifically to ensure that
no premature lamp degradation occurs. (See
"How RangeMAX Works" Section)
Wide Input Voltage Range. The mod-
ules convert unregulated DC voltage from the
system battery or AC adapter directly to high-
frequency, high-voltage waves required to
ignite and operate CCFL lamps.
Direct Drive Technology. The module
design is based on a new Direct Drive topol-
ogy, which provides a number of cost and
performance advantages. The LXM1611-01
series Direct Drive inverters eliminate the clas-
sic resonant inductor and capacitors, thus
reducing cost and allowing a 30% reduction
in module size.
Additional Features. Other benefits of
this new topology are fixed-frequency op-
eration and secondary-side strike-voltage
regulation.
Strike-voltage regulation minimizes corona
discharge in the output transformer and re-
lated circuitry, providing longer life and higher
reliability. All LXM1611 modules feature both
open and shorted lamp protection.
The LXM1611 is fully customizable (elec-
tronically and mechanically) to specific cus-
tomer requirements.
NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.
KEY FEATURES
s RangeMAX Wide Range Dimming
s 8V to 18V Input Voltage Range
s 30% Smaller Than CS-ZVS Models
s Easy To Use Brightness Control
s MicroAmp SLEEP Mode
s Output Short-Circuit Protection And
Automatic Strike-Voltage Regulation
s 7.3mm Max. Module Height, 16mm Module
Width
s Fixed Frequency Operation
A P P L I C AT I O N S
s Notebook And Sub-Notebook Computers
s Portable Instrumentation
s Desktop Displays
s Low Ambient Light Conditions (i.e. Aircraft
Cabins, Automobile)
BENEFITS
s High Efficiency And Sleep Mode Feature
Extends Computer Battery Life
s Smooth, Flicker Free 1-100% Full-Range
Brightness Control Gives Your Product A
High Quality Image
s Output Open Circuit Voltage Regulation
Minimizes Corona Discharge For Long Life
And High Reliability
s Power Efficient, "Low Brightness" Capability
Allows For Advanced Power Management
PRODUCT HIGHLIGHT
RANGEMAX VS. ANALOG DIMMING
5
Standard Analog
Dimming Inverter
4
3
LinFinity's
RangeMAX
2
1
0 30 45 60 75 90 105
Light Output (Nits)
s RangeMAX technology allows the designer to operate
in a lower "brightness" and therefore at lower "power
consumption" than can be reached using traditional
analog dimming inverters.
s Dotted line indicates area where panel variations and
parasitics will impact minimum light level with analog
dimming.
s Data presented for a RangeMAX inverter driving a
13.3" LCD with a 1.2 Nit to 120 Nit brightness range.
The minimum power levels were 0.4 watts
(RangeMAX) vs. 2.1 watts (analog dimming) for a
power consumption savings of 1.7 watts.
MODULE ORDER INFORMATION
LXM1611-01
Copyright © 1999
Rev. 0.4 8/99
LINFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1
1 page  
RangeMAXTM
PRODUCT DATABOOK 1996/1997
DIGITAL DIMMING CCFL INVERTER MODULE
PRELIMINARY DATA SHEET
PATENT PENDING
LXM1611-01
H O W R A N G E M A X W O R K S (continued)
HIGHLIGHTS
s On-board brightness control circuit includes a DC voltage
to pulse width converter that minimizes system design work
and system noise susceptibility. This provides a familiar
and convenient interface while reducing the potential for
externally induced noise which can cause lamp flicker.
s An on-board oscillator operates the inverter BURST rate
above 95Hz, well beyond standard 50/60Hz video refresh
rates where the eye can perceive pulsing light.
s RangeMAX inverter modules are designed to operate with
the burst frequency synchronized to the video frame rate.
This provides operation with no visible display disturbances
caused by beat frequencies between the lamps and video
frame rates.
s In applications with no access to a vertical sync, the in-
verter burst frequency can be allowed to "free run" at 95Hz.
In this non-synchronous mode, minor display disturbances
can be found under certain video conditions. This perfor-
mance may be acceptable for many applications, but syn-
chronization must be used when no disturbance can be
tolerated.
s Separate inputs are provided for negative and positive ver-
tical sync pulses so external inversion is not needed.
s Separate feedback loops for lamp current and open circuit
voltage regulation insure reliable strike under all operat-
ing conditions, automatic over-voltage prevention with bro-
ken or failed lamps, and accurate lamp current regulation.
TYPICAL APPLICATION
2.5VDC
9-18VDC
£ 10k
BRITE
VIN
VHI
LXM1611-01
5V
0V
VSYNC(-)
VSYNC(+)
SLEEP
V VSYNC(-)
SYNC(+)
GND VLO
FIGURE 5 — Potentiometer Brightness Control
CCFL
TUBE
PWM Signal
from System
P.W.
4.99k
4.99k*
4.7µF
£ 100µs
0 £ P.W. £ 100% of period
* Use 4.99k for 5V PWM amplitude, 15k for 3.3V PWM
amplitude, and omit for 2.5V PWM amplitude.
BRITE
LXM1611-01
FIGURE 5A — PWM Brightness Control
s The brightness control may be a simple 10k
potentiometer or a voltage output DAC. A PWM signal
from a micro-controller may also be used with a suitable
filter such as shown in Figure 5A.
s If synchronization to the video framerate is desired,
connect the vertical sync pulse from the system video
controller to the appropriate VSYNC input. If the pulse
is negative going (
), connect it to VSYNC(-). If
positive going (
), connect it to VSYNC(+).
If no video synchronization is desired, leave both VSYNC(-)
and VSYNC(+) floating.
s If you need to turn the inverter ON/OFF remotely,
connect a 3V or 5V logic signal to the SLEEP input. If
remote ON/OFF is not needed, connect the SLEEP input
to VIN or any other voltage greater than 2.2VDC.
s Connect VHI to high voltage wire from the lamp.
Connect VLO to the low voltage wire (wire with thinner
insulation). Never connect VLO to circuit ground as
this will defeat lamp current regulation. If both lamp
wires have heavy high voltage insulation, connect the
longest wire to VLO.
RangeMAX INVERTERS
Also available in Dual
Output LXM1621-01 and
Quad Output LXM1641-01
versions for multiple lamp
applications.
Copyright © 1999
Rev. 0.4 8/99
RangeMAX and Direct Drive are trademarks of Linfinity Microelectronics Inc.
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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