P
A T E N T S
P
TM
E N D I N G
F
A X
D
O C
#:
1614
RangeMAX
T
H E
LXM1614-12-01
P
R
E V I E W
12V H
IGHLY
-I
NTEGRATED
, D
IGITAL
D
IMMING
CCFL I
NVERTER
M
ODULE
I
N F I N I T E
P
O W E R
O F
I
N N O VA T I O N
P
R O D U C T
D
ATA
S
HEET
DESCRIPTION
Dual Drive, RangeMAX Wide Range Dim-
ming, Single Output Inverter.
The LXM1614 series of Direct Drive
TM
CCFL
(Cold Cathode Fluorescent Lamp) Inverter
Modules is specifically designed for driving LCD
backlight lamps. Although similar to the
RangeMAX LXM1612 wide range dimming in-
verters, the LXM1614 family offers two sepa-
rate brightness controls for lamp current am-
plitude and duty cycle. This innovation of dual
brightness controls with extended dimming,
combined with Linfinity’s high efficiency Di-
rect Drive topology provides the industry’s most
feature rich, small form factor inverter avail-
able. The wide range dimming provides ex-
ceptional display readability at less than 1% of
full brightness, allowing both power savings
and low ambient light operating capability.
Dual Drive Dimming Control.
The inverters provide brightness adjustments
utilizing standard lamp current amplitude con-
trol as well as supporting Linfinity’s RangeMAX
wide range dimming technique. Combining
both brightness controls into a single inverter
supports the “self heating” lamp technology by
using a “boost” current feature and still offers
duty cycle control for low brightness opera-
tion. This controlled overdrive capability elimi-
nates the need for traditional resistive heater
wire methods to ensure light output at ex-
tremely low temperatures. The LXM1614 bright-
ness controls support temperature monitoring
with look-up table applications by accepting
either a PWM input or DC voltage. Large panel
lamps with greater thermal inertia can also uti-
lize this “instant-bright” feature and minimize
warm up time.
RangeMAX Digital Dimming Technique.
Digital dimming provides flicker-free brightness
control in any wide range dimming applica-
tion. Dimming ratios greater than 100:1 can be
achieved. A video synchronization feature al-
lows wide ratio dimming without the display
disturbances and interference seen with com-
petitive products. The resultant “burst drive”
that energizes the lamp was designed specifi-
cally to ensure that no premature lamp degra-
dation occurs. Even in overdrive boost mode,
the waveform is carefully controlled to mini-
mize the effects detrimental to lamp life. Indi-
vidual panel specifications should be referenced
for specific thermal and electrical parameters.
Direct Drive Technology.
The module
design is based on the Direct Drive topology,
which provides a number of cost, performance,
and form factor advantages. The LXM1614
series inverters eliminate the classic resonant
inductor/capacitors, and integrate the wide
range dimming logic into the controller.
Additional Features.
Other benefits of this
new topology are fixed-frequency operation
and secondary-side strike-voltage regulation.
Strike-voltage regulation minimizes corona dis-
charge in the output transformer and related
circuitry, providing longer life and higher reli-
ability. All LXM1614 modules feature both open
and shorted lamp protection. The dual drive
LXM1614 is fully customizable (electronically
and mechanically) to specific customer require-
ments.
K E Y F E AT U R E S
s
Independent Dual Brightness Controls For
Lamp Current Amplitude And Duty Cycle
s
RangeMAX 1-100% Wide Range Dimming
With Controlled Overdrive Boost
s
Available In +5V, +12V, and 10V-16V Input
Voltage Versions
s
High Efficiency, Single Stage Direct Drive
Topology
s
–30°C to +85°C Ambient Temperature
Operation
s
Output Open/Short Circuit Protection
s
Automatic Strike-Voltage Regulation
s
Up to 1800V Output Voltage Capability
s
Supports A Wide Variety of Lamp
Connectors
s
Single Sided PCB Component Layout
A P P L I C AT I O N S
s
s
s
s
s
Self Heating Lamp Technology
Extended Cold Temperature Operation
Automotive And Aircraft Cabin Displays
Navigation/GPS Systems/Auto PC
CCFL Panels With Reduced Lamp Current
Specifications
s
Low Ambient Light Conditions Requiring
Wide Range Dimming
s
”Instant On” To Full Brightness For Large LCD
Backlight Panels
BENEFITS
s
High Efficiency And Sleep Mode Feature
Extends Computer Battery Life
s
Lamp Current Amplitude Control Allows
“Boost” And Accelerated Warm Up For
Cold Temperature Operation
s
“Instant On” Minimizes Warm Up Time In
Standard CCFL Applications
s
Optimized To Support Applications
Utilizing Lamp Temperature Detection and
Microprocessor Control Techniques
s
Power Efficient, “Low Brightness” Capability
Allows For Advanced Power Management
And Extends Battery Life In Portable
Applications
s
Fixed Frequency Operation Reduces EMI
and Display Interference Problems
s
Transformer Designed To Minimize Corona
Discharge For Long Life And High Reliability
s
Controlled “Strike” Waveform Minimizes
Damaging Overshoots
NOTE:
For current data & package dimensions, visit our web site:
http://www.linfinity.com.
PRODUCT HIGHLIGHT
B
ACKLIGHT
I
NVERTER
C
OMBINES
C
URRENT
A
MPLITUDE AND
D
IGITAL
T
ECHNIQUES
9mA
6mA
M O D U L E O R D E R I N F O R M AT I O N
LXM1614-12-01
Copyright © 1999
Rev. 0.1a 5/99
L
IN
F
INITY
M
ICROELECTRONICS
I
NC
.
11861 W
ESTERN
A
VENUE
, G
ARDEN
G
ROVE
, CA. 92841, 714-898-8121, F
AX
: 714-893-2570
1
P
AT E N T
P
E N D I N G
PRODUCT DATABOOK 1996/1997
LXM1614-12-01
12V H
IGHLY
-I
NTEGRATED
, D
IGITAL
D
IMMING
CCFL I
NVERTER
M
ODULE
P
R O D U C T
RangeMAX
P
R
E V I E W
TM
D
ATA
S
H E E T
(Note 1)
A B S O L U T E M A X I M U M R AT I N G S
Input Supply Voltage (V
IN1
) ..................................................................................................................................................... -0.3V to 16V
Output Voltage, no load .............................................................................................................................. Internally Limited to 1800V
RMS
Output Current ............................................................................................................................................... 10mA
RMS
(Internally Limited)
Output Power ........................................................................................................................................................................................ 7.5W
Input Signal Voltage (BRITE Input) ............................................................................................................................... -0.3V to V
IN1
+0.3V
Input Signal Voltage (SLEEP, V
SYNC
Inputs) ................................................................................................................... -0.3V to V
IN1
+0.3V
Ambient Operating Temperature, zero airflow .................................................................................................................... -30°C to 85°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 the specified terminal.
R E C O M M E N D E D O P E R A T I N G C O N D I T I O N S (R.C.)
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
Input Supply Voltage Range
Output Power
Brightness Control Input Voltage Range
Lamp Operating Voltage
Lamp Current (Full Brightness)
Operating Ambient Temperature Range
Symbol
V
IN1
P
O
V
BRT ADJ
V
LAMP
I
OLAMP
T
A
Recommended Operating Conditions
Min.
R.C.
Max.
10
0.0
500
-30
12
3.5
2.5
700
6.5
16
4.0
V
IN
1000
85
Units
V
W
V
V
RMS
mA
RMS
°C
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, these specifications apply over the recommended operating conditions and 25°C ambient temperature for the LXM1614-12-01.
Parameter
Output Pin Characteristics
Symbol
Test Conditions
LXM1614-12-01
Min. Typ.
Max.
5.7
8.2
1500
63
6.5
9
0.12
1650
68
-700
-270
2.4
0
-700
-270
2.4
0
2.1
1.9
400
0
7.3
9.8
1800
73
Units
Full Bright Lamp Current
I
L (MAX)
Maximum Lamp Boost Current
I
LBOOST (MAX)
Min. Average Lamp Current (Note 2)
I
L (MIN)
Lamp Start Voltage
V
LS
Operating Frequency
f
O
V
BRT ADJ
= 2.5V
DC
, SLEEP = HIGH, Burst Duty=100%, V
IN1
=12V
V
BRTADJ
=2.5V, V
BOOST
=2.5V, SLEEP = HIGH, T
A
≤
0°C, V
IN1
=12V
V
BRT ADJ
= 0V
DC
, SLEEP = HIGH, Burst Duty= 2%, V
IN1
=12V
-30°C < T
A
< 85°C, V
IN1
≥
5.0V
DC
V
BRT ADJ
= 2.5V
DC
, SLEEP = HIGH, V
IN1
= 5V
DC
V
BRT ADJ
= 0V
DC
V
BRT ADJ
= 2.5V
DC
I
O (LAMP)
= 100% Duty Cycle
I
O (LAMP)
= Minimum Duty Cycle
V
BST ADJ
= 0V
DC
V
BST ADJ
= 2.5V
DC
I
O (LAMP)
= Maximum Boost
I
O (LAMP)
= Minimum Boost
V
IN1
= 10V
V
IN1
= 16V
SLEEP = 5.0V
SLEEP = 0V
mA
RMS
mA
RMS
mA
RMS
V
RMS
KHz
µA
DC
µA
DC
V
DC
V
DC
µA
DC
µA
DC
V
DC
V
DC
V
DC
V
DC
µA
DC
µA
DC
BRITE Input
Input Current
Input Voltage for Max. Lamp Current
Input Voltage for Min. Lamp Current
I
BRT
V
BRT ADJ
V
BRT ADJ
I
BST
V
BST ADJ
V
BST ADJ
V
SLEEP (HI)
V
SLEEP (LO)
I
SLEEP
BOOST Input
Input Current
Input Voltage for Max. Lamp Current
Input Voltage for Min. Lamp Current
SLEEP Input
RUN Mode
SLEEP Mode
Input Current
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 6.5mA
RMS
)
2
Copyright © 1999
Rev. 0.1a 5/99
PCB Design
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