Microsemi LXMG1615-03-02 3.6/5v 2w, digital dimming ccfl inverter module Datasheet

RangeMAX™
®
TM
LXMG1615-03-xx
3.6/5V 2W, DIGITAL DIMMING CCFL INVERTER MODULE
P RODUCTION D ATA S HEET
KEY FEATURES
DESCRIPTION
The resultant “burst drive” that
energizes the lamp was designed
specifically to ensure that no premature
lamp degradation occurs (See the “How
RangeMAX Works” section).
VBATT Voltage Range. The modules
convert the DC voltage from a single liion battery (3.2-4.2V) or a fixed 5V
supply directly to high-frequency, highvoltage 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.
ƒ RangeMAX Wide Range
Dimming
ƒ VBATT – Single Li-Ion Cell
Operation Or Fixed 5V
ƒ Easy to Use Brightness Control
ƒ Output Short-Circuit Protection
and Automatic Strike-Voltage
Regulation
ƒ Fixed Frequency Operation
ƒ RoHS Compliant
APPLICATIONS
ƒ PDA And Sub-Notebook
Computers
ƒ Portable Instrumentation
ƒ Target 8.4” And Smaller Panels
WWW . Microsemi .C OM
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.
BENEFITS
ƒ Smooth, Flicker Free 1-100%
Full-Range Brightness Control
ƒ Output Open Circuit Voltage
Regulation Minimizes Corona
Discharge For High Reliability
ƒ Power Efficient, “Low
Brightness” Capability Allows
For Advanced Power
Management
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
PRODUCT HIGHLIGHT
3.2 - 4.2V
Li-Ion Battery
PDAs, Digital Cameras,
Video Camcorder,
Instrumentation, Handheld GPS
FOR LOWER VOLTAGE LAMPS
CCFL
260 - 380VRMS
LXMG1615
VBATT
VLAMP
Instrumentation, Sub Notebooks,
Digital Picture Frames
FOR HIGHER VOLTAGE LAMPS
CCFL
350 - 515VRMS
ONE INVERTER SUPPORTS EITHER VOLTAGE RANGE
MODULE ORDER INFO
PART NUMBER
OUTPUT CONNECTOR
INVERTER MATES DIRECTLY TO
PANEL CONNECTORS
LXMG1615-03-01
LXMG1615-03-02
LXMG1615-03-03
JST SM02(8.0)B-BHS-1-TB(LF)(SN) or Yeon Ho 20015WR-05A00
JST SM02B-BHSS-1-TB(LF)(SN) or Yeon Ho 35001WR-02A00
Honda QZ-19-A3MYL #02
BHR-03VS-1
BHSR-02VS-1
Honda QZ-19-3F01
Copyright © 2000
Rev. 1.0, 2006-03-23
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
LXMG1615-03-XX
4.5 - 5.5V
RangeMAX™
3.6/5V 2W, DIGITAL DIMMING CCFL INVERTER MODULE
®
TM
LXMG1615-03-xx
P RODUCTION D ATA S HEET
WWW . Microsemi .C OM
ABSOLUTE MAXIMUM RATINGS
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........................................................................................................... Internally 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
Ambient 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.
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.
Parameter
Recommended Operating Conditions
Min
R.C.
Max
Symbol
Input Supply Voltage (+3.3V)
VBATT Voltage Range (VBATT = 3.6V)
VBATT Voltage Range (VBATT = 5.0V)
Output Power (VBATT = 3.6V)
Output Power (VBATT = 5.0V)
Brightness Control Input Voltage Range
Lamp Operating Voltage (VBATT = 3.6V)
Lamp Operating Voltage (VBATT = 5.0V)
Lamp Current (Full Brightness)
Operating Ambient Temperature Range
+3.3
VBATT
VBATT
PO
PO
VBRT_ADJ
VLAMP
VLAMP
IOLAMP
TA
3.1
3.2
4.5
1
1.5
0.0
260
350
3.3
3.6
5.0
1.2
1.7
Units
3.5
4.2
5.5
1.5
2
2.2
380
515
305
445
4.0
0
V
V
V
W
W
V
VRMS
VRMS
mARMS
°C
70
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, these specifications apply over the recommended operating conditions and 25°C ambient temperature for the LXMG1615-03-xx.
Parameter
`
`
OUTPUT PIN CHARACTERISTICS
Full Bright Lamp Current
Min. Average Lamp Current (Note 2)
Lamp Start Voltage
Operating Frequency
BRITE INPUT
Linear Dim Control Range
Input Current
Input Voltage for Max. Lamp Current
Input Voltage for Min. Lamp Current
+3.3V
RUN Mode
OFF Mode
VSYNC CHARACTERISTICS
Logic High Threshold
Logic Low Threshold
Input Impedance
Input Frequency
Free Run Frequency
Copyright © 2000
Rev. 1.0, 2006-03-23
VBRT_ADJ = 0V, VBATT = 3.6V or 5V
VBRT_ADJ = 2.2VDC, VBATT = 3.6V or 5V
VBATT=3.2 –4.2V or 4.5V to 5.5V
VBRT_ADJ = 0VDC
1250
80
3.5
VBRT_ADJ = 0VDC
VBRT_ADJ = 2.5VDC
IO(LAMP) = 100% Duty Cycle
IO(LAMP) = Minimum Duty Cycle
.25
-21
250
0
2.2
ENABLE
DISABLE
IINRUN
IINPK
+3.3V = High
+3.3V = Low
3.1
-0.3
VSYNC (HI)
VSYNC (LO)
ZIN
FVSYNC
FBURST
+3.3V = 3.3V ± 5%
+3.3V = 3.3V ± 5%
VBRT
IBRT
Input Current
`
IL(MAX)
IL(MIN)
VLS
FO
LXMG1615-03-xx
Min
Typ Max
Test Conditions
VBRT_ADJ
VBRT_ADJ
+3.3V ± 5%
4.0
.08
1400
90
-27
268
3.3
0.0
10
100
4.5
1800
100
mARMS
mARMS
VRMS
KHz
2.2
-41
290
.25
2.5
VDC
µADC
µADC
VDC
VDC
3.5
2.7
20
VDC
VDC
2.2
.8
10
45
Output Burst Rate; VSYNC=0V
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
400
530
Units
mA
VDC
VDC
KΩ
Hz
Hz
Page 2
ELECTRICALS
`
Symbol
RangeMAX™
3.6/5V 2W, DIGITAL DIMMING CCFL INVERTER MODULE
®
TM
LXMG1615-03-xx
P RODUCTION D ATA S HEET
ELECTRICAL CHARACTERISTICS (CONTINUED)
Parameter
`
Symbol
Test Conditions
POWER CHARACTERISTICS
Run Current
VBATT= 3.6VDC
Run Current
VBATT= 5.0VDC
LXMG1615-03-xx
Min
Typ Max
Units
360
405
mA
mA
VBRT_ADJ = 0V, VLAMP = 270VRMS
VBRT_ADJ = 0V, VLAMP = 420VRMS
Note 2: Minimum lamp current required to maintain even light output may vary with display panel.
Average RMS current = (burst duty cycle) × (burst amplitude of 4.0mARMS)
FUNCTIONAL PIN DESCRIPTION
Conn.
Pin
Description
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Unless otherwise specified, these specifications apply over the recommended operating conditions and 25°C ambient temperature for the LXMG1615-03-xx.
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 Input 3.3V Logic Level (45 < fSYNC < 400Hz)
CN2 for LXMG1615-03-01,-02 (JST SM02(8.0)B-BHS-1-TB (LF)(SN) | Yeon Ho 20015WR-05A00, SM02B-BHSS-1-TB (LF)(SN) | Yeon
Ho 35001WR-02A00)
High Voltage Connection to High Side of Lamp. Connect to lamp terminal with shortest lead length.
CN2-1
VHI
DO NOT connect to Ground.
Connection to Low Side of Lamp. Connect to lamp terminal with longer lead length.
CN2-2
VLO
DO NOT connect to Ground.
CN2 for LXMG1615-03-03 (Honda QZ-19-A3MYL#02)
High Voltage Connection to High Side of Lamp. Connect to lamp terminal with shortest lead length.
CN2-3
VHI
DO NOT connect to Ground.
Connection to Lower Side of Lamp. Connect to lamp terminal with longer lead length.
CN2-1
VLO
DO NOT connect to Ground.
* LX9506G Mating Connector Assembly Available
PHYSICAL DIMENSIONS
94mm
3.70in
X CN1
15mm
2.5mm
12.5mm
0.492in
0.591in.
0.0984in.
CN2
10mm
0.394in.
GROUNDED MOUNTING
HOLE 3.18MM ±0.08 DIA.
69mm ±0.2mm
2.71in.
1.0mm
4.6mm Max
0.0394in.
R1.0
Copyright © 2000
Rev. 1.0, 2006-03-23
0.181in.
PCB tolerances ± 0.5mm, M2 or 2-56 recommended mounting screws
Warning
High Voltage Present at
high side of transformer
Weight: (5.5g) typ. and Output Connector
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
PACKAGE DATA
W
RangeMAX™
3.6/5V 2W, DIGITAL DIMMING CCFL INVERTER MODULE
®
TM
LXMG1615-03-xx
P RODUCTION D ATA S HEET
WWW . Microsemi .C OM
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 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)
HIGHLIGHTS
•
High Voltage
Transformer
Comparator
Ramp
+
-
.25 2.2VDC
Transformer
Driver
LAMP
VBRITE
VHI
Ramp Gen.
ISENSE VSENSE
Figure 4 – RangeMAX Simplified Block Diagram
Copyright © 2000
Rev. 1.0, 2006-03-23
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
DESCRIPTION
VLO
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
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.
RangeMAX™
3.6/5V 2W, DIGITAL DIMMING CCFL INVERTER MODULE
®
TM
LXMG1615-03-xx
P RODUCTION D ATA S HEET
HOW THE RANGEMAX WORKS (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 desired, 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.
3.2V - 4.2V
or 5V
3.3VDC
BRITE
+3.3V
VBATT
VHI
CCFL
TUBE
LXMG1615-03-xx
SYNC
GND
VLO
VSYNC
Figure 5 - Brightness Control
PWM Signal
from System
WWW . Microsemi .C OM
HIGHLIGHTS (CONTINUED)
BRITE
P.W.
RangeMAX INVERTERS
LXMG1615-03
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.
< 200µS
0 < P.W. < 100% of period
Figure 5A - PWM Brightness Control
Copyright © 2000
Rev. 1.0, 2006-03-23
C12
D1
C13
C14
C7
R6
C8
C10
R8
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
U1
C15
C16
C17
R11
R22
C9
C11
R5
C4
C6
C3
C1
CN1
R7
137K 1% (stock setting)
95.3K1%
68.1K1%
49.9K1%
36.5K1%
R1
R2
R3
R4
R18
R10 R19
Page 5
APPLICATION
4.0mArms
3.5mArms
3.0mArms
2.5mArms
2.0mArms
F1
R9
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:
C5
LXMG1615-03-XX OUTPUT CURRENT ADJUST
RangeMAX™
TM
®
LXMG1615-03-xx
3.6/5V 2W, DIGITAL DIMMING CCFL INVERTER MODULE
P RODUCTION D ATA S HEET
WWW . Microsemi .C OM
NOTES
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.
Copyright © 2000
Rev. 1.0, 2006-03-23
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 6
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