Microsemi
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
Copyright © 2000
Rev. 1.0a, 2005-01-14
WWW.Microsemi .COM
RangeMAX
™
LXM1615-03-xx
3.6/5V
2W,
D
IGITAL
D
IMMING
CCFL
I
NVERTER
M
ODULE
P
RODUCTION
D
ATA
S
HEET
INTEGRATED PRODUCTS
DESCRIPTION
RangeMAX™
Wide
Range
Dimming,
Single
Output
Inverter.
The LXM1615
series of Direct Drive CCFL (Cold
Cathode Fluorescent Lamp) Inverter
Modules are specifically designed for
driving 8.4” and smaller LCD backlight
lamps. They also target portable displays
that rely on a single lithium-ion battery.
LXM1615 modules provide the
designer with a vastly superior display
brightness range. This brightness range is
achievable with virtually any LCD
display.
RangeMAX Digital Dimming
Technique. Digital dimming provides
flicker-free brightness control in any wide
range (100:1+) dimming application.
The modules are available with a
dimming input that permits brightness
control from either a DC voltage source or
a PWM signal.
The resultant “burst drive” that
energizes the lamp was designed spec-
ifically to ensure that no premature lamp
degradation occurs (See the “How
RangeMAX Works” section).
V
BATT
Voltage Range. The modules
convert the DC voltage from a single li-
ion battery (3.2-4.2V) or a fixed 5V
supply directly to high-frequency, high-
voltage waves required to ignite and
operate CCFL lamps.
Direct Drive Technology. The
modules design is based on a new Direct
Drive topology, which provides a number
of cost and performance advantages.
Additional Features. Other benefits
of this new topology are fixed-frequency
operation, secondary-side strike-voltage
regulation and 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 Range
Dimming
V
BATT
– Single Li-Ion Cell
Operation Or Fixed 5V
Easy to Use Brightness Control
Output Short-Circuit Protection
and Automatic Strike-Voltage
Regulation
Fixed Frequency Operation
APPLICATIONS
PDA And Sub-Notebook
Computers
Portable Instrumentation
Target 8.4” And Smaller Panels
BENEFITS
Smooth, Flicker Free 1-100%
Full-Range Brightness Control
Output Open Circuit Voltage
Regulation Minimizes Corona
Discharge For High Reliability
Power Efficient, “Low
Brightness” Capability Allows
For Advanced Power
Management
PRODUCT HIGHLIGHT
LXM1615
PDAs, Digital Cameras,
Video Camcorder,
Instrumentation, Handheld GPS
3.2 - 4.2V
Li-Ion Battery
4.5 - 5.5V
Instrumentation, Sub Notebooks,
Digital Picture Frames
260 - 380V
RMS
350 - 515V
RMS
CCFL
CCFL
V
BATT
V
LAMP
F
OR
L
OWER
V
OLTAGE
L
AMPS
F
OR
H
IGHER
V
OLTAGE
L
AMPS
ONE INVERTER SUPPORTS EITHER VOLTAGE RANGE
MODULE ORDER INFO
P
ART
N
UMBER
O
UTPUT
C
ONNECTOR
I
NVERTER
M
ATES
D
IRECTLY
TO
P
ANEL
C
ONNECTORS
LXM1615-03-01 JST SM02(8.0)B-BHS-1-TB or Yeon Ho 2 0015WR-05A00 BHR-03VS-1
LXM1615-03-02 JST SM02B-BHSS-1-TB or Yeon Ho 35001WR-02A00 BHSR-02VS-1
LXM1615-03-03 Honda QZ-19-A3MYL #0 2 Honda QZ-19-3F01
LXM1615-03-04 JST SM02(4.0)B-BHS-1-TB BHR-02VS-1
L
LX
XM
M1
16
61
15
5-
-0
03
3-
-X
XX
X
Microsemi
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
Copyright © 2000
Rev. 1.0a, 2005-01-14
WWW.Microsemi .COM
RangeMAX
™
LXM1615-03-xx
3.6/5V
2W,
D
IGITAL
D
IMMING
CCFL
I
NVERTER
M
ODULE
P
RODUCTION
D
ATA
S
HEET
INTEGRATED PRODUCTS
ABSOLUTE MAXIMUM RATINGS
RECOMMENDED OPERATING CONDITIONS
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.
Recommende d Operating Conditions
Parameter Symbol
Min R.C. Max
Units
Input Supply Voltage (+3.3V) +3.3 3.1 3.3 3.5 V
V
BATT
Voltage Range (V
BATT
= 3.6V) V
BATT
3.2 3.6 4.2 V
V
BATT
Voltage Range (V
BATT
= 5.0V) V
BATT
4.5 5.0 5.5 V
Output Power (V
BATT
= 3.6V) P
O
1 1.2 1.5 W
Output Power (V
BATT
= 5.0V) P
O
1.5 1.7 2 W
Brightness Control Input Voltage Range V
BRT_ADJ
0.0 2.2 V
Lamp Operating Voltage (V
BATT
= 3.6V) V
LAMP
260 305 380 V
RMS
Lamp Operating Voltage (V
BATT
= 5.0V) V
LAMP
350 445 515 V
RMS
Lamp Current (Full Brightness) I
OLAMP
4.0 mA
RMS
Operating Ambient Temperature Range T
A
0 70
°C
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, these specifications apply over the recommended operating conditions and 25°C ambient temperature for the LXM1615-03-xx.
LXM1615-03-xx
Parameter Symbol Test Conditions
Min Typ Max Units
` OUTPUT PIN CHARACTERISTICS
Full Bright Lamp Current I
L(MAX)
V
BRT_ADJ
= 0V, V
BATT
= 3.6V or 5V 3.5 4.0 4.5 mA
RMS
Min. Average Lamp Current (Note 2) I
L(MIN)
V
BRT_ADJ
= 2.2V
DC
, V
BATT
= 3.6V or 5V .08 mA
RMS
Lamp Start Voltage V
LS
V
BATT
=3.2 –4.2V or 4.5V to 5.5V 1250 1400 1800 V
RMS
Operating Frequency F
O
V
BRT_ADJ
= 0VDC 80 90 100 KHz
` BRITE INPUT
Linear Dim Control Range V
BRT
.25 2.2 V
DC
V
BRT_ADJ
= 0V
DC
-21 -27 -41 µA
DC
Input Current I
BRT
V
BRT_ADJ
= 2.5V
DC
250 268 290 µA
DC
Input Voltage for Max. Lamp Current V
BRT_ADJ
I
O(LAMP)
= 100% Duty Cycle 0 .25 V
DC
Input Voltage for Min. Lamp Current V
BRT_ADJ
I
O(LAMP)
= Minimum Duty Cycle 2.2 2.5 V
DC
` +3.3V
RUN Mode ENABLE +3.3V = High 3.1 3.3 3.5 V
DC
OFF Mode DISABLE +3.3V = Low -0.3 0.0 2.7 V
DC
IIN
RUN
10 20
Input Current IIN
PK
+3.3V ± 5% 100 mA
` VSYNC CHARACTERISTICS
Logic High Threshold V
SYNC (HI)
+3.3V = 3.3V ± 5% 2.2 V
DC
Logic Low Threshold V
SYNC (LO)
+3.3V = 3.3V ± 5% .8 V
DC
Input Impedance Z
IN
10 KΩ
Input Frequency FV
SYNC
45 400 Hz
Free Run Frequency F
BURST
Output Burst Rate; V
SYNC
=0V 530 Hz
E
EL
LE
EC
CT
TR
RI
IC
CA
AL
LS
S
Input Supply Voltage (V
BATT
)..............................................................................................................................-0.3V to 6.5V
Input Supply Voltage 3.3V (+3.3) .......................................................................................................................-0.3V to 5.5V
Output Voltage, no load...........................................................................................................Internal ly Limited to 1800V
RMS
Output Current ..........................................................................................................................4.5mA
RMS
(Internally Limited)
Output Power................................................................................................................................................................. 2.1W
Input Signal Voltage (BRITE Input) ..........................................................................................................-0.3V to 3.3V +0.3V
Input Signal Voltage (SYNC)....................................................................................................................-0.3V to 3.3V +0.3V
A
mbient Operating Temperature, zero airflow......................................................................................................0°C to 70°C
Storage Temperature Range.............................................................................................................................-40°C to 85°C
Note: 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.
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, 2005-01-14
WWW.Microsemi .COM
RangeMAX
™
LXM1615-03-xx
3.6/5V
2W,
D
IGITAL
D
IMMING
CCFL
I
NVERTER
M
ODULE
P
RODUCTION
D
ATA
S
HEET
INTEGRATED PRODUCTS
ELECTRICAL CHARACTERISTICS (CONTINUED)
Unless otherwise specified, these specifications apply over the recommended operating conditions and 25°C ambient temperature for the LXM1615-03-xx.
LXM1615-03-xx
Parameter Symbol Test Conditions
Min Typ Max Units
` POWER CHARACTERISTICS
Run Current V
BATT
= 3.6V
DC
V
BRT_ADJ
= 0V, V
LAMP
= 270V
RMS
360 mA
Run Current V
BATT
= 5.0V
DC
V
BRT_ADJ
= 0V, V
LAMP
= 420V
RMS
405 mA
Note 2: Minimum lamp current required to maintain even light output may vary with display panel.
)4.0mA of amplitudeburst ()cycleduty burst (current RMS Average
RMS
×=
FUNCTIONAL PIN DESCRIPTION
Conn. Pin Description
CN1 (Molex 53261-059 0)*
CN1-1 V
BATT
Main Input Powe r Supply (3.2V to 5.5V)
CN1-2 GND Power Supply Return
CN1-3 +3.3V +3.3V Logic Input
CN1-4 BRITE Brightness Control (0.25- 2.2VDC) 0.25VDC gives maximum lamp current
CN1-5 V
SYNC
Vertical Synchronization Input 3.3V Logic Level (45 < f
SYNC
< 400Hz)
CN2 for LXM1615-03-01,-02,-04 (
JST SM02(8.0)B-BHS-1-TB | Yeon Ho 20015WR-05A00, SM02B-BHSS-1-TB | Yeon Ho 35001WR-
02A00, or SM02(4.0)B-BHS-1-TB
)
CN2-1 V
HI
High Voltage Connection to High 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 terminal with longer lead length.
DO NOT connect to Ground.
CN2 for LXM1615-03-03 (Ho nda Q Z -19-A3MYL#02)
CN2-3 V
HI
High Voltage Connection to High Side of Lamp. Connect to lamp terminal with shortest lead length.
DO NOT connect to Ground.
CN2-1 V
LO
Connection to Lower Side of Lamp. Connec t to lamp terminal with longer lead length.
DO NOT connect to Ground.
* LX9506 Mating Connector Assembly Available
PHYSICAL DIMENSIONS
1.0mm
0.0394in.
Weight: (5.5g) typ
.
4.6mm Max
0.181in.
94mm
3.70in
CN1
CN2
W
10mm
0.394in.
2.5mm
0.0984in.
15mm
0.591in.
12.5mm
0.492in
X
PCB tolerances ± 0.5mm, M2 or 2-56 recommended mounting screws
Warning
High Voltage Present at
high side of transformer
and Output Connector
G
ROUNDED
M
OUNTING
H
OLE 3.18MM ±0.08
DIA
.
69mm ±0.2mm
2.71in.
R1.0
P
PA
AC
CK
KA
AG
GE
E
D
DA
AT
TA
A
Microsemi
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
Copyright © 2000
Rev. 1.0a, 2005-01-14
WWW.Microsemi .COM
RangeMAX
™
LXM1615-03-xx
3.6/5V
2W,
D
IGITAL
D
IMMING
CCFL
I
NVERTER
M
ODULE
P
RODUCTION
D
ATA
S
HEET
INTEGRATED PRODUCTS
HOW THE 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 fu ll 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
High Voltage
Transformer
Comparator
Ramp +
-
I
SENSE
V
SENSE
LAMP
V
LO
V
HI
V
BRITE
.25 -
2.2V
DC
Figure 4 – RangeMAX Simplified Block Diagram
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 ex ternally ind uc ed no ise, which
can cause lamp flicker.
•
RangeMAX inverter modules are designed to operate
with the burst freq uency synchronized to the v ideo 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
500Hz. 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.
D
DE
ES
SC
CR
RI
IP
PT
TI
IO
ON
N
Microsemi
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
Copyright © 2000
Rev. 1.0a, 2005-01-14
WWW.Microsemi .COM
RangeMAX
™
LXM1615-03-xx
3.6/5V
2W,
D
IGITAL
D
IMMING
CCFL
I
NVERTER
M
ODULE
P
RODUCTION
D
ATA
S
HEET
INTEGRATED PRODUCTS
HOW THE RANGEMAX WORKS (CONTINUED)
HIGHLIGHTS (CONTI NUE D )
•
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.
•
A single input will accommodate negative and positive
vertical sync pulses at any pulse width.
TYPICAL APPLICATION
•
The Brightness control may be a voltage output DAC, or
other voltage source as shown in Figure 5. A 3.3V 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 VSYNC input. If no video
synchronization is desi red, connect VSYNC to ground.
•
If you need to turn the inverter ON/OFF remotely, use the
+3.3V Logic Supply pin.
•
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. This wire is typically white.
RangeMAX INVERTERS
Also available in higher power single lamp inverters
LXM1612-xx-xx, Dual Output LXM1621-01,
LXM1622-xx-xx and Quad Output LXM1641-01
versions for multiple lamp applications.
LXM1615-03-xx
3.3VDC
3.2V - 4.2V
or 5V
VSYNC
SYNC GND
VHI
VLO
BRITE
Fig ure 5 - Brightness Co ntrol
+3.3V VBATT
CCFL
TUBE
Error! Not a valid link.
LXM1615-03-XX OUTPUT CURRENT ADJUST
The LXM1615-03 -xx output current can be adjusted lower
by changing the value of one resistor (R10) on the PCB.
The following table shows the new outpu t current values:
4.0mArms 137K 1% (stock setting)
3.5mArms 95.3K1%
3.0mArms 68.1K1%
2.5mArms 49.9K1%
2.0mArms
36.5K1%
Error! Not a valid link.
A
AP
PP
PL
LI
IC
CA
AT
TI
IO
ON
N
Microsemi
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 6
Copyright © 2000
Rev. 1.0a, 2005-01-14
WWW.Microsemi .COM
RangeMAX
™
LXM1615-03-xx
3.6/5V
2W,
D
IGITAL
D
IMMING
CCFL
I
NVERTER
M
ODULE
P
RODUCTION
D
ATA
S
HEET
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 per formance of the product and to disc ontinue product at any time.
N
NO
OT
TE
ES
S
