A
M I C R O S E M I
C O M P A N Y
RangeMAX™
LXM1622-12-xx
D
UAL
5W, D
IGITAL
D
IMMING
CCFL I
NVERTER
M
ODULE
P
RELIMINARY
D
ATA
S
HEET
RangeMAX™ Wide Range Dimming,
Dual Output Inverter.
The LMX1622
series of Direct Drive CCFL (Cold
Cathode Fluorescent Lamp) Inverter
Modules are specifically designed for
driving two lamp LCD displays. They are
available in two power and input voltage
ranges.
LMX1622 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 dim-
ming 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” section).
Input Voltage Range.
The modules
convert the DC voltage from a fixed 12V
supply directly to high frequency, high-
voltage waves required to ignite and
operate CCFL lamps. A 5V input inverter
is also available; LXM1612-05 series.
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. If lamp fails to strike the
inverter will timeout and shutdown.
RangeMAX Wide Range
Dimming
Fixed 5V input
Easy to Use Brightness Control
Output Short-Circuit Protection
and Automatic Strike-Voltage
Regulation and Timeout
Fixed Frequency Operation
Microamp SLEEP mode
W W W .
Microsemi
.
COM
Notebook Sub-Notebook
Computers
Portable Instrumentation
Low Ambient Light
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
D C V o lta g e
S o u rc e
P o te n t io m e te r
PW M
S ig n a l
BRITE
2
1
P
ART
N
UMBER
L
AMP
C
URRENT
LMX1622-12-01
LMX1622-12-02
LMX1622-12-03
Copyright
©
2000
Rev. 0.3,2001-01-18
6.5mA
5.5mA
5.5mA
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
3
1
2
3
LXM1622-12-
XX
LXM1622-12-
XX
L
AMP RUN
VOLTAGE
O
UTPUT
C
ONNECTOR
JST SM02(8.0)B-BHS-1-TB
JST SM02(8.0)B-BHS-1-TB
Honda QZ-19-A3MYL #02
I
NVERTER
M
ATES
D
IRECTLY
TO
P
ANEL
C
ONNECTORS
BHR-03VS-1
BHR-03VS-1
QZ-19-3F01
Page 1
500-750
350-550
350-550
Microsemi
A
M I C R O S E M I
C O M P A N Y
RangeMAX™
LXM1622-12-xx
D
UAL
5W, D
IGITAL
D
IMMING
CCFL I
NVERTER
M
ODULE
P
RELIMINARY
D
ATA
S
HEET
Input Supply Voltage (V
IN
)................................................................................................................................... -0.3V to 16V
Output Voltage, no load .......................................................................................................... Internally Limited to 1800V
RMS
Output Current .......................................................................................................................... 7.5mA
RMS
(Internally Limited)
Output Power (for 2 lamps)..............................................................................................................................................12W
Input Signal Voltage (BRITE , V
SYNC
Input)...................................................................................................... -0.3V to +6.5V
Input Signal Voltage (SLEEP).................................................................................................................... -0.3V to V
IN
+0.5V
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.
W W W .
Microsemi
.
COM
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
V
IN
Voltage Range
Output Power (-01)
Output Power (-02,-03)
Brightness Control Input Voltage Range
Lamp Operating Voltage (-01)
Lamp Operating Voltage (-02,-03)
Lamp Current Full Brightness (-01)
Lamp Current Full Brightness (-02,-03)
Operating Ambient Temperature Range
Symbol
V
IN
P
O
P
O
V
BRT_ADJ
V
LAMP
V
LAMP
I
OLAMP
I
OLAMP
T
A
Recommended Operating Conditions
Min
R.C.
Max
10.8
5.8
3
0.0
500
300
12.0
8
5
625
425
6.5
5.5
13.2
10.8
6
2.5
750
500
Units
V
W
W
V
V
RMS
V
RMS
mA
RMS
mA
RMS
°C
0
70
Unless otherwise specified, these specifications apply over the recommended operating conditions and 25°C ambient temperature for the LMX1622-12-xx.
Parameter
OUTPUT PIN CHARACTERISTICS
Full Bright Lamp Current (-01)
Full Bright Lamp Current (-02,-03)
Min. Average Lamp Current (Note 2)
Lamp Start Voltage
Operating Frequency
Fault Timeout
BRITE INPUT
Linear Dim Control Range
Input Current
Input Voltage for Max. Lamp Current
Input Voltage for Min. Lamp Current
SLEEP INPUT
RUN Mode
OFF Mode
Input Current
Symbol
I
L(MAX)
I
L(MAX)
I
L(MIN)
V
LS
F
O
T
FAULT
V
BRT
I
BRT
V
BRT_ADJ
V
BRT_ADJ
V
SLEEP
V
SLEEP
II
SLEEP
V
SYNC (HI)
V
SYNC (LO)
Z
IN
FV
SYNC
F
BURST
Test Conditions
V
BRT_ADJ
= 2.25V
V
BRT_ADJ
= 2.25V
V
BRT_ADJ
= 0V
DC
V
BRT_ADJ
= 2.25VDC
LXM1622-12-xx
Min
Typ Max
5.85
4.95
1350
66
6.5
5.5
.25
1500
76
1.6
7.15
6.05
1800
86
Units
mA
RMS
mA
RMS
mA
RMS
V
RMS
KHz
SEC
V
DC
µA
DC
µA
DC
V
DC
V
DC
V
DC
V
DC
uA
V
DC
V
DC
KΩ
Hz
Hz
V
BRT_ADJ
= 0V
DC
V
BRT_ADJ
= 2.5V
DC
I
O(LAMP)
= 100% Duty Cycle
I
O(LAMP)
= Minimum Duty Cycle
V
IN
=12V
V
IN
=12V
SLEEP=5.0V
SLEEP=0.0V
V
IN
=12V
V
IN
=12V
.25
-680
196
2.25
0
1.5
-0.3
400
-710
203
2.2
-730
220
2.5
0.25
E
LECTRICALS
E
LECTRICALS
425
0
0.8
450
VSYNC CHARACTERISTICS
Logic High Level
Logic Low Level
Input Impedance
Input Frequency
Free Run Frequency
1.5
0
27
50
190
0.8
150
310
Output Burst Rate; V
SYNC
=0V
250
Copyright
©
2000
Rev. 0.3,2001-01-18
Microsemi
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
A
M I C R O S E M I
C O M P A N Y
Parameter
Symbol
I
RUN
I
RUN
I
SLEEP
RangeMAX™
LXM1622-12-xx
D
UAL
5W, D
IGITAL
D
IMMING
CCFL I
NVERTER
M
ODULE
P
RELIMINARY
D
ATA
S
HEET
Unless otherwise specified, these specifications apply over the recommended operating conditions and 25°C ambient temperature for the LMX1622-12-xx.
W W W .
Microsemi
.
COM
Test Conditions
LMX1622-12-xx
Min
Typ Max
Units
POWER CHARACTERISTICS
Run Current (LXM1622-12-01)
Run Current (LXM1622-12-02,03))
Sleep Current
V
IN
=12V,V
BRT_ADJ
= 2.25V, V
LAMP
= 625V
RMS
V
IN
=12V,V
BRT_ADJ
= 2.25V, V
LAMP
= 425V
RMS
V
IN
= 12V, SLEEP = 0.0V
0.0
800
450
0.5
10
mA
mA
µA
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 full lamp current
Conn.
Pin
Description
CN1
(Molex 53261-0890)
*
CN1-1,2
V
IN
Main Input Power Supply (10.8V to 13.2V)
CN1-3,4
GND
Power Supply Return
SLEEP
CN1-5
>1.5V(Backlight on), <0.8V (backlight off), II
SLEEP
=425uA @ 5.0V, disabled if left open
CN1-6
BRITE
Brightness Control (0.25- 2.2VDC) 2.25VDC gives maximum lamp current
CN1-7
BRITE RTN Signal Ground (0Vdc)
CN1-8
V
SYNC
Vertical Synchronization Input (50 < f
SYNC
> 150Hz), minimum pulse width 10uS
CN2,3 for LMX1622-12-01, 02
(JST SM02(8.0)B-BHS-1-TB)
High Voltage Connection to High Side of Lamp. Connect to lamp terminal with shortest lead
CN2-1
V
HI
length.
DO NOT
connect to Ground.
Connection to Low Side of Lamp. Connect to lamp terminal with longer lead length.
CN2-2
V
LO
DO NOT
connect to Ground.
CN2,3 for LMX1622-12-03
(Honda QZ-19-AMYL#02)
High Voltage Connection to High Side of Lamp. Connect to lamp terminal with shortest lead
CN2-3
V
HI
length.
DO NOT
connect to Ground.
Connection to Lower Side of Lamp. Connect to lamp terminal with longer lead length.
CN2-1
V
LO
DO NOT
connect to Ground.
*
LX9501 Mating Connector Assembly Available
All dimensions are in inches (mm)
0.078in.
2mm
4.88in.
124mm
CN2, CN3
(Connector Type)
P
ACKAGE
D
ATA
P
ACKAGE
D
ATA
CN1
0.118in.
3mm
0.068in.
1.75m m
1
1.26in.
32mm
SM02(8.0)B-BHS-1-TB
(JST)
3
1
0.118in.
CN2
0.24in.
6mm
3mm
CN3
Honda QZ-19-AMYL#02
1.89in.
48mm
1.50in.
38mm
0.060in.
1.52m m
CN2
CN3
.229in.
7.6m m
W eight: 24.5 (g) typ.
Copyright
©
2000
Rev. 0.3,2001-01-18
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
C O M P A N Y
RangeMAX™
LXM1622-12-xx
D
UAL
5W, D
IGITAL
D
IMMING
CCFL I
NVERTER
M
ODULE
P
RELIMINARY
D
ATA
S
HEET
LAMP VOLTAGE & LAMP CURRENT –
BURST MODE OPERATION
W W W .
Microsemi
.
COM
!"
– 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 5% duty cycle, allowing the
lamp to be dimmed to less than 3% 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.
!" #
– 5% Burst Duty Cycle
!" $
– 5% Burst Duty Cycle (Expanded Time Base)
HIGHLIGHTS
C o m p a ra to r
V
B R IT E
Ramp
0 .2 5 -
2 .2 V
D C
-
+
H ig h V o lta g e
T ra n sfo rm e r
V
HI
•
LAM P
Ramp G en.
T ra n sfo rm e r
D riv e r
V
LO
V
HI
V
SE NS E
V
SYNC
I
SE N S E
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.
LAM P
D
ESCRIPTION
D
ESCRIPTION
Figure 4
– RangeMAX Simplified Block Diagram
Copyright
©
2000
Rev. 0.3,2001-01-18
Microsemi
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
A
M I C R O S E M I
C O M P A N Y
RangeMAX™
LXM1622-12-xx
D
UAL
5W, D
IGITAL
D
IMMING
CCFL I
NVERTER
M
ODULE
P
RELIMINARY
D
ATA
S
HEET
HIGHLIGHTS (CONTINUED)
W W W .
Microsemi
.
COM
•
In applications with no access to a vertical sync, an onboard
oscillator operates the inverter burst rate at about 270Hz. 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.
•
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 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.
C C F
•
If you need to turn the inverter ON/OFF remotely, connect
a 2.5V to 5V logic signal to the SLEEP input. If remote
TUB
ON/OFF is not needed, connect the SLEEP input to V
IN
or
other voltage source between 2.5V and 5V.
•
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.
•
+ 12 V
D C
B R IT E
V
IN
V
HI
L X M 1 6 2 2 -1 2 -xx
B R IT E R T N
2 .5 -
S L EE P
5V
V
S YN C
GND
V
LO
0
V
S YN C
F ig u re 5
- Brig h tn e ss C o n tro l
PW M Sig na l
fro m Syste m
%& "
BR IT E
Also available in single lamp inverters LXM1612-xx-
xx, 5V dual LXM1622-05-xx and Quad Output
LXM1641-01 versions for multiple lamp applications.
P.W .
LXM 1622-12-xx
1 mS to 20 0 µ S
0 < P.W. < 100% of period
F ig u re 5 A
- PW M Brigh tne ss C on tro l
A
PPLICATIONS
A
PPLICATIONS
Copyright
©
2000
Rev. 0.3,2001-01-18
Microsemi
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
京公网安备 11010802033920号
EEWORLD
