Micrel LXM1643-12-62 12v quad 6w ccfl programmable inverter module Datasheet

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I N T E G R A T E D
P R O D U C T S
LXM1643-12-62
12V Quad 6W CCFL Programmable Inverter Module
P RODUCTION D ATASHEET
KEY FEATURES
DESCRIPTION
The resultant “burst drive” that
energizes the lamp was designed
specifically to ensure that no premature
lamp degradation occurs, while allowing
significant power savings at lower dim
levels.
The modules convert DC voltage from
the system battery or AC adapter directly
to high frequency, high-voltage waves
required to ignite and operate CCFL
lamps.
The LXM1643-12-62
inverter is
intended for panel assemblies with
individual lamp connections, or where
lamps are spaced apart from each other.
The LXM1643-12-61 inverter should be
used for panel applications where lamp
pairs are in close proximity and share a
common return (low side) wire.
Other benefits of this new topology
are stable fixed-frequency operation,
secondary-side strike-voltage regulation
and both open/shorted lamp protection
with fault timeout.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
ƒ Externally Programmable
Maximum Output Current
ƒ Easy to Use Brightness
Control
ƒ RangeMAX Wide Range
Dimming
ƒ Output Short-Circuit Protection
and Automatic Strike-Voltage
Regulation and Timeout
ƒ Fixed Frequency Operation
ƒ Rated From -20 to 70°C
ƒ UL 60950 E175910
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The LXM1643-12-62 is a Quad 6W
Output Direct Drive™ CCFL (Cold
Cathode Fluorescent Lamp) Inverter
Module specifically designed for driving
LCD backlight lamps. It is ideal for
driving typical 12.1” to 18.1” TFT panels.
LXM1643 modules provides the
designer with a vastly superior display
brightness range then typical with analog
(amplitude control) dimming.
The inverter includes a dimming input
that permits brightness control from either
a DC voltage source or a PWM signal or
external Potentiometer. The maximum
output current is externally programmable
over a range of 5 to 8mA in 1mA steps to
allow the inverter to properly match to a
wide array of LCD panel lamp current
specifications.
RangeMAX
Digital
Dimming
Technique provides flicker-free brightness
control in any wide range typically (50:1+)
dimming application.
APPLICATIONS
ƒ High Brightness Displays
ƒ Desktop Displays
ƒ Industrial Display Controls
BENEFITS
ƒ Smooth, Flicker Free 2%100% Full-Range Brightness
Control
ƒ Programmable output
current allows inverter to
mate with a wide variety of
LCD panel specifications
ƒ
PRODUCT HIGHLIGHT
Universal Dimming Input PWM, VDC, or Potentiometer
DC Voltage
Source
Potentiometer
PWM
Signal
"
"
LXM1643-12-62
Selectable Maximum Output Current 5mA to 8mARMS
PACKAGE ORDER INFO
Copyright  2002
Rev. 1.0, 2003-10-14
PART NUMBER
OUTPUT CONNECTORS
LXM1643-12-62
Four JST SM02B-BHSS-1-TB
INVERTER MATES DIRECTLY TO
PANEL CONNECTORS
JST BHSR-02VS-1
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
PanelMatch™
I N T E G R A T E D
LXM1643-12-62
12V Quad 6W CCFL Programmable Inverter Module
P R O D U C T S
P RODUCTION D ATASHEET
Input Signal Voltage (VIN1).....................................................................................................................................-0.3V to 15V
Input Power ....................................................................................................................................................................... 30W
Output Voltage, no load ............................................................................................................ Internally Limited to 2000VRMS
Output Current (each output) ......................................................................................................9.5mARMS (Internally Limited)
Output Power (each output) ............................................................................................................................................. 6.0W
Input Signal Voltage ( SLEEP Input) ..................................................................................................................... -0.3V to VIN1
Input Signal Voltage (BRITE) ...............................................................................................................................-0.3V to 5.5V
Ambient Operating Temperature, zero airflow.....................................................................................................-20°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.
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ABSOLUTE MAXIMUM RATINGS (NOTE 1)
RECOMMENDED OPERATING CONDITIONS (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
Symbol
Input Supply Voltage Range (Fully Regulated
Lamp Current)
Input Supply Voltage Range (Functional)
Output Power (each output)
Linear BRITE Control Input Voltage Range
Lamp Operating Voltage
Lamp Current (Full Brightness)
Operating Ambient Temperature Range
VIN1
PO
VBRT_ADJ
VLAMP
IOLAMP
TA
Recommended Operating Conditions
Min
R.C.
Max
10.8
12
13.2
10.2
12
5.0
13.8
6.0*
2.0
730
8
70
0.5
530
5
-20
625
Units
V
W
V
VRMS
mARMS
°C
*Total output power must not exceed 6W . Higher voltage lamps may require maximum output current to be set lower than 8mARMS
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, the following specifications apply over the recommended operating condition and ambient temperature of
25°C except where otherwise noted.
Parameter
`
Symbol
Test Conditions
LXM1643-12-62
Min
Typ
Max
Units
OUTPUT PIN CHARACTERISTICS
IL(MAX)
Full Bright Lamp Current (each output)
IL(MAX)
Full Bright Lamp Current (each output)
IL(MAX)
Full Bright Lamp Current (each output)
IL(MAX)
Output Current Lamp to Lamp
Deviation
ILL%DEV
Min. Average Lamp Current
(each output)
Lamp Start Voltage
Operating Frequency
Burst Frequency
Copyright  2002
Rev. 1.0, 2003-10-14
IL(MIN)
VLS
fO
fBURST
VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 12VDC
ISET1 = Ground, ISET2 = Ground
VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 12VDC
ISET1 = Ground, ISET2 = Open
VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 12VDC
ISET1 = Open, ISET2 = Ground
VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 12VDC
ISET1 = Open, ISET2 = Open
VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 12VDC
ISET1 = Open, ISET2 = Open
VBRT_ADJ ≤0.5VDC, SLEEP > 2.0V, VIN1 = 12VDC
ISET1 = ISET2 = Ground
-20°C < TA < 70°C, VIN1 > 10.8VDC
1500
VBRT_ADJ = 2.5VDC, SLEEP > 2.0V, VIN1 = 12V
Output Burst Frequency
69
72
75
kHz
269
281
279
Hz
4.0
5
5.5
mARMS
5.0
6
6.6
mARMS
6.0
7
7.7
mARMS
7.0
8
8.8
mARMS
3
10
%
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
.30
mARMS
1650
VRMS
Page 2
ELECTRICALS
Full Bright Lamp Current (each output)
PanelMatch™
I N T E G R A T E D
P R O D U C T S
LXM1643-12-62
12V Quad 6W CCFL Programmable Inverter Module
P RODUCTION D ATASHEET
Parameter
`
Symbol
`
`
LXM1643-12-62
Min
Typ
Max
Units
-300
50
µADC
µADC
BRITE INPUT
Input Current
`
Test Conditions
IBRT
VBRT_ADJ = 0VDC
VBRT_ADJ = 3VDC
Minimum Input for Max. Lamp Current
VBRT_ADJ
IO(LAMP) = Maximum Lamp Current
Maximum Input for Min. Lamp Current
VBRT_ADJ
IO(LAMP) = Minimum Lamp Current
2.0
0.4
2.05
0.5
VDC
VDC
SLEEP INPUT
RUN Mode
VSLEEP
2.0
VIN1
VDC
SLEEP Mode
VSLEEP
-0.3
0.8
VDC
0.4
V
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ELECTRICAL CHARACTERISTICS (CONTINUED)
Unless otherwise specified, the following specifications apply over the recommended operating condition and ambient temperature of
25°C except where otherwise noted.
SET1,2 INPUT
SET1,2 Low Threshold
VL
Input Current
ISET
VSET ≤ 0.4V
-300
µA
POWER CHARACTERISTICS
Sleep Current
IIN(MIN)
Run Current
IRUN
η
Efficiency
VIN1 = 12VDC, SLEEP < 0.8V
0.0
VIN1 = 12VDC, SLEEP ≥ 2.0V, ISET1 = Open
ISET2 = Ground, VLAMP = 625VRMS
VIN1 = 12VDC, SLEEP ≥ 2.0V, ISET1 = Open
ISET2 = Ground, VLAMP = 625VRMS
10
30
µADC
1750
mADC
85
%
FUNCTIONAL PIN DESCRIPTION
CONN
PIN
DESCRIPTION
CN1 (Molex 53261-1290) Mates with 51021-1200 housing, 50079-8100 pins. Mates with LX9508 input cable assembly
CN1-1,2,3
VIN1
Main Input Power Supply (10.8V < VIN1 < 13.2V)
CN1-4,5,6
GND
Power Supply Return
CN1-7
AGND
Analog Signal Ground
CN1-8
NC
CN1-9
SLEEP
CN1-10
BRITE
CN1-11
SET1
SET1 MSB Connecting this pin to ground decreases the output current (see Table 1)
CN1-12
SET2
SET2 LSB Connecting this pin to ground decreases the output current (see Table 1)
No Connect
ON/OFF Control. (0V < SLEEP < 0.8 = OFF, SLEEP >= 2.0V = ON
Brightness Control (0.5V to 2.0VDC). 2.0VDC gives maximum lamp current.
CN2-CN5-1
VHI1
High voltage connection to high Side of lamp. Connect to lamp terminal with shortest lead length.
DO NOT connect to Ground.
CN2-CN5-2
VLO
Connection to low side of lamp. Connect to lamp terminal with longer lead length.
DO NOT connect to Ground
Copyright  2002
Rev. 1.0, 2003-10-14
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
ELECTRICALS
CN2-CN5 (JST SM02B-BHSS-1-TB)
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I N T E G R A T E D
LXM1643-12-62
12V Quad 6W CCFL Programmable Inverter Module
P R O D U C T S
P RODUCTION D ATASHEET
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TABLE 1
OUTPUT CURRENT SETTINGS
SET1
(Pin 11)
Open*
Open*
Ground
Ground
SET2
(Pin 12)
Open*
Ground
Open*
Ground
Nominal Output Current
8.0mA
7.0mA
6.0mA
5.0mA
* If driven by a logic signal it should be open collector or open drain only, not a voltage source.
PHYSICAL DIMENSIONS
LXM1643-12-62
188mm
7.40in.
182mm
6mm
SM02B-BHSS-1-TB
(JST) × 4
7.165in.
4mm
0.23in
0.16in
4mm
CN-1
0.16in
W
W
28mm ± 0.2mm
36mm
1.10in.
1.42in.
W
W
94mm
GROUNDED MOUNTING HOLES
3.18MM ±.08 DIA.
4mm
3.70in.
0.16in.
88mm ± 0.2mm
88mm ± 0.2mm
Warning
3.645in.
3.645in.
High Voltage Present at
high side of Transformer
and Output Connector
4.7mm
8mm Max
0.18in.
PCB tolerances ± 0.5mm
1.7mm
Weight: (45g) typ.
0.315in.
0.67in.
All dimensions are in millimeters, inches are for reference only.
SIMPLIFIED BLOCK DIAGRAM
High Voltage Transformers
10K
Comparator
+
0.5 2V DC
Ramp
V IN1
V HI
Output
Driver
Z
Ram p
Gen
10K
SET 1
SET 2
Z
OC SENSE
LAMP
+3V
PACKAGE DATA
LAMP
V BRIT E
V HI
Controller
+3V
OV SENSE
+3V
10K
V LO
I SENSE
Z
V LO
One of two
Copyright  2002
Rev. 1.0, 2003-10-14
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
PanelMatch™
I N T E G R A T E D
P R O D U C T S
LXM1643-12-62
12V Quad 6W CCFL Programmable Inverter Module
P RODUCTION D ATASHEET
TYPICAL APPLICATION
V IN1
BRITE
The brightness control may be a voltage output DAC or
other voltage source, a digital pot or 20K manual pot. The
inverter contains an internal 10K pull-up to 3V to bias the
pot add a 1.8K resistor to set the lower threshold voltage.
A 3.3V Logic Level PWM signal from a micro-controller
may also be used as shown in Figure 1A.
ƒ
If you need to turn the inverter ON/OFF remotely, connect
to TTL logic signal to the SLEEP input.
ƒ
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.
ƒ
Use the SET1 and SET2 (see Figure 2) inputs to select the
desired maximum output current. Using these two pins in
combination allows the inverter to match a wide variety of
panels from different manufactures. Generally the best
lamp lifetime correlates with driving the CCFL at the
manufactures nominal current setting. However the SET1
and SET2 inputs allow the user the flexibility to adjust the
current to the maximum allowable output current to
increase panel brightness at the expense of some reduced
lamp life.
ƒ
Although the SET pins are designed such that just leaving
them open or grounding them is all that is needed to set the
output current, they can also be actively set. Using a open
collector or open drain logic signal will allow you to
reduce the lamp current for situations where greater dim
range is required, as an example in nighttime situations. In
conjunction with a light sensor or other timer the panel
could be set to higher brightness (maximum output
current) for daytime illumination and lower brightness
(minimum or typical output current) at nighttime. Since
the dim ratio is a factor of both the burst duty cycle and the
peak output current, using this technique the effective dim
ratio can be increased greater than the burst duty cycle
alone. Conversely the SET inputs could be used to
overdrive the lamp temporarily to facilitate faster lamp
warm up at initial lamp turn on. Of course any possible
degradation on lamp life from such practices is the users
responsibility since not all lamps are designed to be
overdriven.
ƒ
The inverter has a built in fault timeout function. If the
output return is open (lamp disconnected or broken) or
shorted the inverter will attempt to strike the lamp for
several seconds. After about a second without success the
inverter will shutdown. In order to restart the inverter it is
necessary to toggle the sleep input or cycle the VIN1 input
supply. In the timeout shutdown mode input drain current
will be about 8mA.
V Hx
V Hx
0.45V 20K
to 2.0V
LXM1643-12-62
1.8K
V LO x
SLEEP
SET 1
SET 2
GND
V LO x
One of
two
NC
NC
Figure 1 – Brightness Control
(Output current set to maximum)
PW M Signal
from System
BRITE
P.W .
LXM1643-12-62
10us to 125uS
0 < P.W. < 100% of period
Figure 1A – PWM Brightness Control
12V
BRITE
V IN1
LXM1643-12-62
SLEEP
SET 1
L
L
H
H
SET 2
GND
One
of two
L
5.0mARMS
H
6.0mARMS
L
7.0mARMS
H
8.0mARMS
L=GND; H=Open
Figure 2 – Max Output Current
(SET1 and SET2 Inputs)
Copyright  2002
Rev. 1.0, 2003-10-14
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
APPLICATION
ƒ
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12V
DAC or
Pot
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I N T E G R A T E D
P R O D U C T S
LXM1643-12-62
12V Quad 6W CCFL Programmable Inverter Module
P RODUCTION D ATASHEET
NOTES
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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  2002
Rev. 1.0, 2003-10-14
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 6
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