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RODUCTION
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ATASHEET
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Page 1
Copyright © 2000
Rev. 1.0a, 2005-01-10
WWW.Microsemi .COM
LXM1612-05-xx
5V Highly-Integrated, Digital Dimming CCFL Inverter Module
INTEGRATED PRODUCTS
DESCRIPTION
RangeMAX Wide Range Dimming,
Single Output Inverter. The LXM1612-
05-xx series of Direct Drive™ CCFL
(Cold Cathode Fluorescent Lamp)
Inverter Modules are specifically
designed for driving LCD backlight
lamps.
RangeMAX Digital Dimming
Technique. Digital Dimming provides
flicker-free brightness control in any
wide-range dimming application.
The modules are equipped with a
dimming input that permits brightness
control from an external potentiometer,
DC voltage source, or PWM signal. The
resultant “burst drive” that energizes the
lamp was designed specifically to ensure
that no premature lamp degradation
occurs.
Input Voltage Range: The modules
convert DC voltage from the system
battery or AC adapter directly to high-
frequency, high-voltage waves required
to ignite and operate CCFL lamps. A
12V input inverter is also available
(LXM1612-12-xx)
Direct Drive Technology: The module
design is based on a new Direct Drive
topology, which provides a number of
cost and performance ad-vantages.
Additional Feature: Other benefits of
this new topology are fixed-frequency
operation and secondary-side strike-
voltage regulation and all LXM1612-05-
xx modules feature both open and
shorted lamp protection.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
Protected by U.S. Patents: 5,923,129; 5,930,121; Patents Pending
KEY FEATURES
RangeMAX Wide Ra nge
Dimming
Single 5V Input Voltage
Fully Integrated Direct Drive
And Dimming Control
Single Sided PCB La yout
Easy To Use Brightness
Control
MicroAmp
SLEEP
Mode
Output Short-Circuit
Protection And Automatic
Strike-Voltage Regulation
Fixed Frequency Operation
UL 60950 E175910
APPLICATIONS
Notebook And Sub-Notebook
Computers
Portable Instrumentation
Desktop Displays
Low Ambient Light
Conditions (i.e. Aircraft
Cabins, Automobile)
BENEFITS
Smooth, Flicker Free 1-100%
Full-Range Brightness
Control Gives Your Product
A High Quality Image
Output Open Circuit Voltage
Regulation Minimizes Corona
Discharge For Long Life And
High Reliabilit y
Power Efficient. “Low
Brightness” Capability Allows
For Advanced Power
Management
PRODUCT HIGHLIGHT
123
W
U
NIVERSAL
D
IMMING
I
NPUT
"PWM", VDC,
OR
P
OTENTIOMETER
DC Voltage
Source Potentiometer PWM
Signal
PACKAGE ORDER INFO
P
ART
N
UMBER
O
UTPUT
C
ONNECTOR
I
NVERTER
M
ATES
D
IRECTLY
TO
P
ANEL
C
ONNECTORS
LXM1612-05-01 JST SM02(8.0)B-BHS-1-TB or Yeon Ho 20015WR-05A00 BHR-03VS-1
LXM1612-05-02 JST SM02B-BHSS-1-TB or Yeon Ho 35001WR-02A00 BHSR-02VS-1
LXM1612-05-03 Honda QZ-19-A3MYL #02 Honda QZ-19-3F01
L
LX
XM
M1
16
61
12
2-
-0
05
5
BRITE
P
RODUCTION
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Page 2
Copyright © 2000
Rev. 1.0a, 2005-01-10
WWW.Microsemi .COM
LXM1612-05-xx
5V Highly-Integrated, Digital Dimming CCFL Inverter Module
INTEGRATED PRODUCTS
ABSOLUTE MAXIMUM RATINGS
(NOTE 1)
Input Signal Voltage (V
IN1
)................................................................................................................................-0.3V to 6.5V
Output Voltage, no load.........................................................................................................Internally Limited to 1800V
RMS
Output Current ........................................................................................................................8.0mA
RMS
(Internally Limited)
Output Power ................................................................................................................... ............................................... 6.0W
Input Signal Voltage (BRITE Input).........................................................................................................-0.3V to V
IN1
+0.3V
Input Signal Voltage (
SLEEP
, V
SYNC
Inputs)............................................................................................-0.3V to V
IN1
+0.3V
Ambient Operating Temperature, zero airflow.....................................................................................................0°C to 70°C
Storage Temperature Range.............................................................................................................................. -40°C to 85°C
Note 1: Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground. Currents are positive into, negative out of
specified terminal.
FUNCTIONAL PIN DESCRIPTION
C
ONN
P
IN
D
ESCRIPTION
CN1 (Molex 53261-0890) Mates with 51021-0800 housing, 50079-8100 pins
CN1-1
CN1-2 V
IN1
Main Input Power Supply (4.5V < V
IN1
< 5.5V
CN1-3
CN1-4 GND Power Supply Return
CN1-5
SLEEP
ON/OFF Control. (2.1V <
SLEE
P
< V
IN1
= ON, 0V <
SLEE
P
< 0.8V = OFF,
SLEE
P
Floating = OFF)
CN1-6 BRITE Brightness Control (0.0V to 2.5V
DC
). 2.5V
DC
gives maximum lamp current.
CN1-7 BRITE RTN Analog Ground. Use for BRITE signal return ONLY.
CN1-8 V
SYNC
Vertical Synchronization In put. 2.5 to 5.0V Logic Level. (20Hz < f
SYNC
< 200Hz)
CN2 for LXM1612-05-01 and -02 (JST SM02(8.0)B-BHS-1-TB | Yeon Ho 20015WR-05A00 or SM02B-BHSS-1-TB | Yeon Ho
35001WR-02A00)
CN2-1 V
HI
High voltage connection to hi gh Side of lamp. Connect to lamp terminal with shortest lead length.
DO NOT connect to Ground.
CN2-2 V
LO
Connection to low side of lamp. Connect to lamp termin al with longer lead length.
DO NOT connect to Ground
CN2 for LXM1612-05-03 (Honda QZ-19-A3MYL#02)
CN2-3 V
HI
High voltage connection to hi gh sid e of lamp. Connect to lamp terminal with shortest lead length.
DO NOT connect to Ground.
CN2-1 V
LO
Connection to low side of lamp. Connect to lamp termin al with longer lead length.
DO NOT connect to Ground
PHYSICAL DIMENSIONS
LXM1612-05-XX
4.96in.
126mm
0.06in.
1.52mm
CN1
CN2
W
X
0.13in.
3.3mm
0.66in.
16.75mm
Weight: 12.5 (g) typ
.
0.63in.
16mm
3.64in.
92.5mm
0.5in.
12.7mm
0.315in.
8.0mm
Warning
High Voltage Present at all
Output Connectors
G
ROUNDED
M
OUNTING
H
OLE
3.0mm
DIA
. ± .08
DIA
M
OUNTING
H
OLE
3.0mm
DIA
. ± .08
DIA
PCB tolerances ± 0.5mm
P
PA
AC
CK
KA
AG
GE
E
D
DA
AT
TA
A
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RODUCTION
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ATASHEET
Microsemi
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
Copyright © 2000
Rev. 1.0a, 2005-01-10
WWW.Microsemi .COM
LXM1612-05-xx
5V Highly-Integrated, Digital Dimming CCFL Inverter Module
INTEGRATED PRODUCTS
RECOMMENDED OPERATING CONDITIONS (R.C.)
This module has been designed to operate over a wide range of input and output conditions. However, best efficiency and performance
will be obtained if the module is operated under the condition listed in the ‘R.C.’ column. Min. and Max. columns indicate values
beyond which the inverter, although operational, will not function optimally.
Recommended Operating Conditions
Parameter Symbol
Min R.C. Max Units
Input Supply Voltage Range (Fully Regulated
Lamp Current) 4.5 5 5.5
Input Supply Voltage Range ( Functional) V
IN1
4.35 5 5.65 V
Output Power P
O
3.5 4.0 W
Brightness Control Input Voltage Range V
BRT_ADJ
0.0 2.5 V
IN
V
Lamp Operating Voltage V
LAMP
450 535 620 V
RMS
Lamp Current (Full Brightness) I
OLAMP
5.8 mA
RMS
Operating Ambient Temperatu r e Range T
A
0 70 °C
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, the following specifications apply over the recommended operating condition and ambient temperature of
25°C except where otherwise noted.
LXM1612-05-xx
Parameter Symbol Test Conditions Min Typ Max
Units
`
OUTPUT PIN CHARACTERISTICS
Full Bright Lamp Current I
L(MAX)
V
BRT_ADJ
=2.5V
DC
, SLEEP=HIGH,
Burst Duty=100%, V
IN1
=5V
DC
5.2 5.8 6.4 mA
RMS
Min. Average Lamp Current
(Note 2) I
L(MIN)
V
BRT_ADJ
=0V
DC
, SLEE
P
=HIGH, Burst Duty=2.0%,
V
IN1
=5V
DC
0.12 mA
RMS
Lamp Start Voltage V
LS
0°C <T
A
< 70°C, V
IN1
> 5.0V
DC
1500 1650 1800 V
RMS
Operating Frequency f
O
V
BRT_ADJ
=2.5V
DC
, SLEEP=HIGH, V
IN1
=5.0V 63 68 73 kHz
`
BRITE INPUT
V
BRT_ADJ
=0V
DC
-685 -728 -775 µA
DC
Input Current I
BRT
V
BRT_ADJ
=2.5V
DC
-260 -282 -305 µA
DC
Input Voltage for Max. Lamp Current V
BRT_ADJ
I
O(LAMP)
=100% Duty Cycle 2.30 2.35 2.40 V
DC
Input Voltage for Min. Lamp Current V
BRT_ADJ
I
O(LAMP)
= Minimum Duty Cycle 0.0 V
DC
`
SLEE
P
INPUT
RUN Mode V(HI)SLEEP V
IN1
=4.5V 1.9 2.1 V
IN1
V
DC
SLEE
P
Mode V(LO)SLEEP V
IN1
=5.5V -5.0 1.9 2.0 V
DC
SLEEP=5.0V 390 410 435 µA
DC
Input Current I
SLEEP
SLEEP=0V 0.0 0.0 0.0 µA
DC
`
VSYNC CHARACTERISTICS
V
SYNCH(HI)
V
IN1
=4.5V 1.50 2.5 5.0 V
DC
Logic High Level V
SYNCH(LO)
V
IN1
=5.5V -3.0 0.0 1.2 V
DC
Input Impedance Z
IN
25 27 29 KΩ
Input Frequency f
SYNC
20 200 Hz
`
POWER CHARACTERISTICS
Sleep Current I
IN(MIN)
V
IN1
=5V
DC
,
SLEEP
=0.0V 0.0 0.5 10 µA
DC
Note 2: Minimum lamp current required to maintain even light output may vary with display panel.
Average RMS current = (Burst Duty Cycle) x (Burst amplitude of 5.8mARMS)
E
EL
LE
EC
CT
TR
RI
IC
CA
AL
LS
S
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RODUCTION
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ATASHEET
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Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
Copyright © 2000
Rev. 1.0a, 2005-01-10
WWW.Microsemi .COM
LXM1612-05-xx
5V Highly-Integrated, Digital Dimming CCFL Inverter Module
INTEGRATED PRODUCTS
HOW RANGEMAX WORKS
LAMP VOLTAGE & LAMP CURRENT – Burst Mode Operation
Figure 1 – 50% Burst Duty Cycle Figure 2 – 2% Burst Duty Cycle
Rather than using the traditional dimming technique of varying
lamp current magnitude to adjust light output, RangeMAX
inverters use a fixed lamp current value with a duty cycle control
method.
The lamp current burst width can be modulated from 100%
(continuous lamp current) down to a 2% duty cycle, allowing the
lamp to be dimmed to less than 1% of its full brightness.
As can be seen in Trace 4 of Figure 3 photo at right, careful
design consideration was given to controlling lamp start voltage
to softly start current flow. This eliminates current overshoot that
can result in premature cathode wear and reduce lamp life.
Figure 3 – 2% Burst Duty Cycle (Expanded Time Base)
Ramp Gen
Transformer
Driver
0.25 -
2.5V
DC
+
-
LAMP
V
LO
V
HI
Comparator
Ramp
V
BRITE
V
SYNC
High Voltage
Transformer
ISENSE
VSENSE
Figure 4 – RangeMAX Block Diagram
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DE
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ATASHEET
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Linfinity Microelectronics Division
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Page 5
Copyright © 2000
Rev. 1.0a, 2005-01-10
WWW.Microsemi .COM
LXM1612-05-xx
5V Highly-Integrated, Digital Dimming CCFL Inverter Module
INTEGRATED PRODUCTS
HOW RANGEMAX WORKS (CONTINUED)
Highlights
Integrated 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.
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. In this synchronous mode, the
inverter burst rate operates at twice the video refresh rate,
well beyond standard 50/60Hz video refresh rates where
the eye can perceive pulsing light.
In applications with no access to a vertical sync., an onboard
oscillator operates the inverter burst rate at about 250Hz. In
this non-synchronous mode, minor display disturbances can
be found under certain video conditions. This performance
may be acceptable for many applications, but
synchronization must be used when no disturbance can be
tolerated.
A single input will accommodate negative and positive
vertical sync pulses at any pulse width.
Separate feedback loops for lamp current and open circuit
voltage regulation insure reliable strike under all operating
conditions, automatic over-voltage prevention with broken
or failed lamps, and accurate lamp current regulation.
TYPICAL APPLICATION
LXM1612-05-xx
5V
V
SYNC
V
SYNC
GND
V
HI
V
LO
BRITE
Figure 5 - Potentiometer Brightness Control
V
IN1
CCFL
TUBE
BRITE RTN
R
10k
SLEEP
0V 5V
DAC or
Pot
P.W.
2ms
BRITE
LXM1612-05-xx
0 < P.W . < 100% o f period
PWM Signal
fro m S y s te m
Figure 5A - PW M Brightness Control
The brightness control may be a voltage output DAC, digital
resistor or a simple 10k potentiometer. If desired, an
additional series resistor with the 10k potentiometer can be
used to set a higher minimum brightness setting as shown in
Figure 5. A 2.5V to 5V Logic Level PWM signal from a
micro-controller may also be used as shown in Figure 5A.
If synchronization to the video frame rate is desired, connect
the vertical sync pulse from the system video controller to
the V
SYNC
input. If no video synchronization is desired,
connect V
SYNC
to ground.
If you need to turn the inverter ON/OFF remotely, connect
to 2.5V to 5V logic signal to the
SLEE
P
input.
Connect V
HI
to high voltage wire from the lamp. Connect
V
LO
to the low voltage wire (wire with thinner insulation).
Never connect V
LO
to circuit ground as this will defeat lamp
current regulation. If both lamp wires have heavy high
voltage insulation, connect the longest wire to V
LO
. This
wire is typically white.
LXM1612-05-XX OUTPUT CURRENT ADJUST
The LXM1612-05 output current can be adjusted by changing the
value of two resistors on the PCB. The following table shows the
approximate new output current values:
Output Current R12 R16
7.0mA 2.00K 1% Not Used
6.0mA 2.61K 1% Not Used
5.8mA 2.74K 1% Not Used
5.0mA 2.74K 1% 499K 1%
4.0mA 2.74K 1% 178K 1%
3.0mA 2.74K 1% 78.7K 1%
C2
U1
C9 R7
C11 R14
R15
C15
C12
R11
C14
C13
R10
C16
C10
R13
C17
R3R4
C3
C4
R2
C5
C6 C8
R5
R6
R17
R37
R36
R35
C21
R38
R39
R32
R31
R40
R41
R20
C7
R21
U3
R34R33R30
U4
D2 D1
R16
R12
Figure 6
-
Component Replacement Locations
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Page 6
Copyright © 2000
Rev. 1.0a, 2005-01-10
WWW.Microsemi .COM
LXM1612-05-xx
5V Highly-Integrated, Digital Dimming CCFL Inverter Module
INTEGRATED PRODUCTS
NOTES
PRODUCTION DATA – Information contained in this document is proprietary to
Microsemi and is current as of publication date. This document may not be modified in
any way without the express written consent of Microsemi. Product processing does not
necessarily include testing of all parameters. Microsemi reserves the right to change the
configuration and performance of th e product and to discontinue product at any time.
N
NO
OT
TE
ES
S
