Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
Copyright © 2000
Rev. 1.0, 2006-03-23
WWW.Microsemi .COM
RangeMAX
™
LXMG1615-03-xx
3.6/5V 2W, DIGITAL DIMMING CCFL INVERTER MODULE
P
RODUCTION
D
ATA
S
HEET
TM ®
DESCRIPTION
RangeMAX™ Wide Range Dimming,
Single Output Inverter. The LXMG1615
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.
LXMG1615 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
specifically to ensure that no premature
lamp degradation occurs (See the “How
RangeMAX Works” sect ion ).
VBATT 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
RoHS Compliant
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
LXMG1615
PDAs, Digital Cameras,
Video Camco rder,
Instrumentation, Handheld GPS
3.2 - 4.2V
Li-Ion Battery
4.5 - 5.5V
Instrumentation, Sub Notebooks,
Digital Picture Frames
260 - 380VRMS
350 - 515VRMS
CCFL
CCFL
VBATT VLAMP
FOR LOWER VOLTAGE LAMPS
FOR HIGHER VOLTAGE LAMPS
ONE INVERTER SUPPORTS EITHER VOLTAGE RANGE
MODULE ORDER INFO
PART NUMBER OUTPUT CONNECTOR INVERTER MATES DIRECTLY TO
PANEL CONNECTORS
LXMG1615-03-01 JST SM02(8.0)B-BHS-1-TB(LF)(SN) or Yeon Ho 20015WR-05A00 BHR-03VS-1
LXMG1615-03-02 JST SM02B-BHSS-1-TB(LF)(SN) or Yeon Ho 35001WR-02A00 BHSR-02VS-1
LXMG1615-03-03 Honda QZ-19-A3MYL #02 Honda QZ-19-3F01
L
LX
XM
MG
G1
16
61
15
5-
-0
03
3-
-X
XX
X
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
Copyright © 2000
Rev. 1.0, 2006-03-23
WWW.Microsemi .COM
RangeMAX
™
LXMG1615-03-xx
3.6/5V 2W, DIGITAL DIMMING CCFL INVERTER MODULE
P
RODUCTION
D
ATA
S
HEET
TM ®
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.
Recommended Operating Conditions
Parameter Symbol
Min R.C. Max
Units
Input Supply Voltage (+3.3V) +3.3 3.1 3.3 3.5 V
VBATT Voltage Range (VBATT = 3.6V) VBATT 3.2 3.6 4.2 V
VBATT Voltage Range (VBATT = 5.0V) VBATT 4.5 5.0 5.5 V
Output Power (VBATT = 3.6V) PO 1 1.2 1.5 W
Output Power (VBATT = 5.0V) PO 1.5 1.7 2 W
Brightness Control Input Voltage Range VBRT_ADJ 0.0 2.2 V
Lamp Operating Voltage (VBATT = 3.6V) VLAMP 260 305 380 VRMS
Lamp Operating Voltage (VBATT = 5.0V) VLAMP 350 445 515 VRMS
Lamp Current (Full Brightness) IOLAMP 4.0 mARMS
Operating Ambient Temperature Range TA 0 70
°C
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, these specifications apply over the recommended operating conditions and 25°C ambient temperature for the LXMG1615-03-xx.
LXMG1615-03-xx
Parameter Symbol Test Conditions
Min Typ Max Units
` OUTPUT PIN CHARACTERISTICS
Full Bright Lamp Current IL(MAX) V
BRT_ADJ = 0V, VBATT = 3.6V or 5V 3.5 4.0 4.5 mARMS
Min. Average Lamp Current (Note 2) IL(MIN) V
BRT_ADJ = 2.2VDC, VBATT = 3.6V or 5V .08 mARMS
Lamp Start Voltage VLS V
BATT=3.2 –4.2V or 4.5V to 5.5V 1250 1400 1800 VRMS
Operating Frequency FO V
BRT_ADJ = 0VDC 80 90 100 KHz
` BRITE INPUT
Linear Dim Control Range VBRT .25 2.2 VDC
V
BRT_ADJ = 0VDC -21 -27 -41 µADC
Input Current IBRT VBRT_ADJ = 2.5VDC 250 268 290 µADC
Input Voltage for Max. Lamp Current VBRT_ADJ I
O(LAMP) = 100% Duty Cycle 0 .25 VDC
Input Voltage for Min. Lamp Current VBRT_ADJ I
O(LAMP) = Minimum Duty Cycle 2.2 2.5 VDC
` +3.3V
RUN Mode ENABLE +3.3V = High 3.1 3.3 3.5 VDC
OFF Mode DISABLE +3.3V = Low -0.3 0.0 2.7 VDC
IINRUN 10 20
Input Current IINPK +3.3V ± 5% 100 mA
` VSYNC CHARACTERISTICS
Logic High Threshold VSYNC (HI) +3.3V = 3.3V ± 5% 2.2 VDC
Logic Low Threshold VSYNC (LO) +3.3V = 3.3V ± 5% .8 VDC
Input Impedance ZIN 10 KΩ
Input Frequency FVSYNC 45 400 Hz
Free Run Frequency FBURST Output Burst Rate; VSYNC=0V 530 Hz
E
EL
LE
EC
CT
TR
RI
IC
CA
AL
LS
S
Input Supply Voltage (VBATT) ..............................................................................................................................-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 1800VRMS
Output Current ..........................................................................................................................4.5mARMS (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
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
Copyright © 2000
Rev. 1.0, 2006-03-23
WWW.Microsemi .COM
RangeMAX
™
LXMG1615-03-xx
3.6/5V 2W, DIGITAL DIMMING CCFL INVERTER MODULE
P
RODUCTION
D
ATA
S
HEET
TM ®
ELECTRICAL CHARACTERISTICS (CONTINUED)
Unless otherwise specified, these specifications apply over the recommended operating conditions and 25°C ambient temperature for the LXMG1615-03-xx.
LXMG1615-03-xx
Parameter Symbol Test Conditions
Min Typ Max Units
` POWER CHARACTERISTICS
Run Current VBATT= 3.6VDC V
BRT_ADJ = 0V, VLAMP = 270VRMS 360 mA
Run Current VBATT= 5.0VDC V
BRT_ADJ = 0V, VLAMP = 420VRMS 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 53261-0571)*
CN1-1 VBATT Main Input Power Supply (3.1V 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 VSYNC Vertical Synchronization In put 3.3V Logic Level (45 < fSYNC < 400Hz)
CN2 for LXMG1615-03-01,-02 (JST SM02(8.0)B-BHS- 1-TB (L F)(SN ) | Yeon Ho 20015WR-05A00, SM02B-BHSS-1-TB (LF )(SN ) | Yeon
Ho 35001WR-02A00)
CN2-1 VHI High Voltage Connection to High Side of Lamp. Connect to lamp terminal with shortest lead length.
DO NOT connect to Ground.
CN2-2 VLO Connection to Low Side of Lamp. Connect to lamp terminal with longer lead length.
DO NOT connect to Ground.
CN2 for LXMG1615-03-03 (H onda QZ-19-A3MYL#02)
CN2-3 VHI High Voltage Connection to High Side of Lamp. Connect to lamp terminal with shortest lead length.
DO NOT connect to Ground.
CN2-1 VLO Connection to Lower Side of Lamp. Connect to lamp terminal with longer lead length.
DO NOT connect to Ground.
* LX9506G Mating Connector Assem bly 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
GROUNDED MOUNTING
HOLE 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
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
Copyright © 2000
Rev. 1.0, 2006-03-23
WWW.Microsemi .COM
RangeMAX
™
LXMG1615-03-xx
3.6/5V 2W, DIGITAL DIMMING CCFL INVERTER MODULE
P
RODUCTION
D
ATA
S
HEET
TM ®
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 full brigh tness.
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 Voltag e
Transformer
Comparator
Ramp +
-
ISENSE VSENSE
LAMP
VLO
VHI
VBRITE
.25 -
2.2VDC
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, wh ich
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
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
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
Copyright © 2000
Rev. 1.0, 2006-03-23
WWW.Microsemi .COM
RangeMAX
™
LXMG1615-03-xx
3.6/5V 2W, DIGITAL DIMMING CCFL INVERTER MODULE
P
RODUCTION
D
ATA
S
HEET
TM ®
HOW THE RANGEMAX WORKS (CONTINUED)
HIGHLIGHTS (CONTINUED)
• 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 t o grou n d.
• 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
LXMG1612-xx-xx, Dual Output LXMG1621-01,
LXMG1622-xx-xx and Quad Output LXMG1641-01
versions for multiple lamp applications.
LXMG1615-03-xx
3.3VDC
3.2V - 4.2V
or 5V
VSYNC
SYNC GND
VHI
VLO
BRITE
Figure 5 - Brightness Control
+3.3V VBATT
CCFL
TUBE
P.W.
< 200µS
BRITE
LXMG1615-03
0 < P.W. < 100% of per i od
PWM Signal
from System
Figure 5A - PWM Brightness Control
LXMG1615-03-XX OUTPUT CURRENT ADJUST
The LXMG1615-03-xx output current can be adjusted
lower by changing the value of one resistor (R10) on the
PCB. The following table shows the new output current
values:
4.0mArms 137K 1% (stock setting)
3.5mArms 95.3K1%
3.0mArms 68.1K1%
2.5mArms 49.9K1%
2.0mArms 36.5K1%
R11 R19
U1
R8
C10
C8
R6
C7
C6
C5
C4
C12
D1
C13
C14
C15
C16
C17 R18
R22
C11
R9
CN1
R7
R5
C1
C3
R4
R3
R2
R1
F1
R10
C9
A
AP
PP
PL
LI
IC
CA
AT
TI
IO
ON
N
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 6
Copyright © 2000
Rev. 1.0, 2006-03-23
WWW.Microsemi .COM
RangeMAX
™
LXMG1615-03-xx
3.6/5V 2W, DIGITAL DIMMING CCFL INVERTER MODULE
P
RODUCTION
D
ATA
S
HEET
TM ®
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 the product and to discontinue product at any time.
N
NO
OT
TE
ES
S
