Microsemi LXM1615-03-04 3.6/5v 2w, digital dimming ccfl inverter module Datasheet

A
M I C R O S E M I
RangeMAX
LXM1615-03-xx
3.6/5V 2W, DIGITAL DIMMING CCFL INVERTER MODULE
C O M P A N Y
P RELIMINARY D ATA S HEET
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.
The
Direct Drive Technology.
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.
RangeMAX Wide Range
Dimming
VBATT – 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
PDA And Sub-Notebook
Computers
Portable Instrumentation
Target 8.4” And Smaller Panels
W W W . Microsemi . COM
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.
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
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
3 .2 - 4 .2 V
L i-Io n B a tte ry
PD As, D igital C am eras,
Video C am corder,
Instrum entation, H andheld G P S
F O R L O W E R V O L T AG E L AM P S
CCFL
260 - 380V RMS
V B AT T
V LAM P
Instrum entation, Sub N otebooks,
D igital Picture Fram es
4 .5 - 5 .5 V
F O R H IG H E R V O L T AG E L AM P S
CCFL
350 - 515V RMS
Copyright  2000
Rev. 0.3d,2000-11-30
LXM1615-03-XX
PART NUMBER
OUTPUT CONNECTOR
INVERTER MATES DIRECTLY
TO PANEL CONNECTORS
LXM1615-03-01
LXM1615-03-02
LXM1615-03-03
LXM1615-03-04
JST SM02(8.0)B-BHS-1-TB
JST SM02B-BHSS-1-TB
Honda QZ-19-A3MYL #02
JST SM02(4.0)B-BHS-1-TB
BHR-03VS-1
BHSR-02VS-1
QZ-19-3F01
BHR-02VS-1
Microsemi
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
A
M I C R O S E M I
RangeMAX
LXM1615-03-xx
3.6/5V 2W, DIGITAL DIMMING CCFL INVERTER MODULE
C O M P A N Y
P RELIMINARY D ATA S HEET
W W W . Microsemi . COM
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.
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
Unless otherwise specified, these specifications apply over the recommended operating conditions and 25°C ambient temperature for the LXM1615-03-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. 0.3d,2000-11-30
LXM1615-03-xx
Min
Typ Max
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
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
Test Conditions
VBRT_ADJ
VBRT_ADJ
3.5
+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
Linfinity Microelectronics 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
A
M I C R O S E M I
RangeMAX
LXM1615-03-xx
3.6/5V 2W, DIGITAL DIMMING CCFL INVERTER MODULE
C O M P A N Y
P RELIMINARY D ATA S HEET
Parameter
Symbol
POWER CHARACTERISTICS
Run Current
VBATT= 3.6VDC
Run Current
VBATT= 5.0VDC
Test Conditions
LXM1615-03-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)
Conn.
Pin
Description
W W W . Microsemi . COM
Unless otherwise specified, these specifications apply over the recommended operating conditions and 25°C ambient temperature for the LXM1615-03-xx.
CN1 (Molex 53261-0590)*
CN1-1
VBATT
Main Input Power 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
VSYNC
Vertical Synchronization Input 3.3V Logic Level (45 < fSYNC < 400Hz)
CN2 for LXM1615-03-01,-02,-04 (JST SM02(8.0)B-BHS-1-TB, SM02B-BHSS-1-TB, or SM02(4.0)B-BHS-1-TB)
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 LXM1615-03-03 (Honda QZ-19-AMYL#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.
* LX9506 Mating Connector Assembly Available
0.0984 in.
0.492 in.
2.5m m
12.5m m
C N -2
1
-03
10m m
2.71 in.
69m m
1
3
0.181 in.
4.6m m
1
PACKAGE DATA
0.394i n.
SM 02B-BH SS -1-T B
(JST )
C N -1
0.591 in.
15 m m
-02
-04
1
SM 02(4.0)B-BH S-1-T B
(JST )
94m m
SM 02(8.0)B-BH S-1-T B
(JST )
-01
3.70 in.
H onda Q Z -19-A3M YL #02
W eight: 5.5 (g) typ.
0.0394 in.
1.0m m
Copyright  2000
Rev. 0.3d,2000-11-30
Microsemi
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
A
M I C R O S E M I
RangeMAX
LXM1615-03-xx
3.6/5V 2W, DIGITAL DIMMING CCFL INVERTER MODULE
C O M P A N Y
P RELIMINARY D ATA S HEET
W W W . Microsemi . COM
LAMP VOLTAGE & LAMP CURRENT – BURST MODE OPERATION
– 50% 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.
– 2% Burst Duty Cycle
! – 2% Burst Duty Cycle (Expanded Time Base)
HIGHLIGHTS
•
H igh Voltage
T ransformer
C omparator
V HI
V BR IT E
+
.25 2.2V D C
T ransformer
D river
LAM P
R amp
R amp G en.
I SEN SE
V SEN SE
Figure 4 – RangeMAX Simplified Block Diagram
Copyright  2000
Rev. 0.3d,2000-11-30
Microsemi
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
DESCRIPTION
V LO
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.
A
M I C R O S E M I
RangeMAX
LXM1615-03-xx
3.6/5V 2W, DIGITAL DIMMING CCFL INVERTER MODULE
C O M P A N Y
P RELIMINARY D ATA S HEET
•
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.
•
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 - 4.2 V
or 5 V
3.3V D C
B R IT E
V BAT T
+3.3V
V HI
CCFL
TUBE
LX M 1 615-03-xx
SYNC
GND
V LO
V SYN C
F ig u re 5 - B rightness C ontro l
PW M Signal
from System
BRIT E
W W W . Microsemi . COM
HIGHLIGHTS (CONTINUED)
"# $
P.W .
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.
LXM 1615-03-xx
< 200µ S
0 < P.W. < 100% of period
F ig ure 5A - PW M Brightness C ontrol
C6
C1
R3
C7
R5
C9
R6
U1
R9
C8
C 11
D1
C 13
C 14
R4
C N1
R7
137K 1% (stock setting)
95.3K1%
68.1K1%
49.9K1%
36.5K1%
C4
C 10
R8
C 15
C 16
C 17
R 11
R 18
R 10
R 19
Preliminary Data – Information contained in this document is pre-production data and is proprietary to LinFinity. It
may not be 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.
Copyright  2000
Rev. 0.3d,2000-11-30
Microsemi
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
APPLICATION
4.0mArms
3.5mArms
3.0mArms
2.5mArms
2.0mArms
R1
R2
R 22
F1
C 12
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 output current values:
C5
)
C3
%&'(!'
Similar pages