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RangeMAX
INTEGRATED PRODUCTS
LXM1622-05-xx
DUAL 5W, DIGITAL DIMMING CCFL INVERTER MODULE
PRELIMINARY DATA SHEET
DESCRIPTION
KEY FEATURES
WWW .Microsemi .C OM
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 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.
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 5V supply directly to high-frequency, highvoltage waves required to ignite and operate CCFL lamps. A 12V input inverter is also available; LXM1612-12 series. 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. 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
APPLICATIONS
Notebook Sub-Notebook Computers Portable Instrumentation Low Ambient Light
BENEFITS
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
PRODUCT HIGHLIGHT
D C V o lt a g e S o u rc e
P o t e n tio m e te r
PW M S ig n a l
BRITE
1
2
3
PART NUMBER LAMP CURRENT
LXM1622-05-01 LXM1622-05-02 LXM1622-05-03
Copyright 2000 Rev. 0.5f, 2003-01-20
6.5mA 5.5mA 5.5mA
Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
1 2 3
LXM1622-05-XX LXM1622-05-XX
U
N IV E R S A L
DC
D
OR
IM M IN G
P
IN
PUT
"P W M ", V
,
O T E N T IO M E T E R
MODULE ORDER INFO LAMP RUN OUTPUT CONNECTOR
VOLTAGE
INVERTER MATES DIRECTLY TO PANEL CONNECTORS
BHR-03VS-1 BHR-03VS-1 QZ-19-3F01
500-750 350-550 350-550
JST SM02(8.0)B-BHS-1-TB JST SM02(8.0)B-BHS-1-TB Honda QZ-19-A3MYL #02
Microsemi
Page 1
RangeMAX
INTEGRATED PRODUCTS
LXM1622-05-xx
DUAL 5W, DIGITAL DIMMING CCFL INVERTER MODULE
PRELIMINARY DATA SHEET
ABSOLUTE MAXIMUM RATINGS (NOTE 1)
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Input Supply Voltage (VIN) .....................................................................................................................................-0.3V to 6V Output Voltage, no load........................................................................................................... Internally Limited to 1800VRMS Output Current...........................................................................................................................7.5mARMS (Internally Limited) Output Power (for 2 lamps) ............................................................................................................................................. 12W Input Signal Voltage (BRITE, VSYNC Input) ................................................................................................. -0.3V to VIN +0.3V Input Signal Voltage (SLEEP) .................................................................................................................... -0.3V to VIN +0.3V Ambient Operating Temperature, zero airflow......................................................................................................0C to 70C Storage Temperature Range.............................................................................................................................-40C to 85C
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.
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
VIN 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
VIN PO PO VBRT_ADJ VLAMP VLAMP IOLAMP IOLAMP TA
Recommended Operating Conditions Min R.C. Max
4.75 5.8 3 0.0 500 300 5.0 8 5 625 425 6.5 5.5 5.25 10.8 6 2.5 750 500
Units
V W W V VRMS VRMS mARMS mARMS C
0
70
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, these specifications apply over the recommended operating conditions and 25C ambient temperature for the LMX1622-05-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 VSYNC CHARACTERISTICS Logic High Level Logic Low Level Input Impedance Input Frequency Free Run Frequency Copyright 2000 Rev. 0.5f, 2003-01-20
Symbol
IL(MAX) IL(MAX) IL(MIN) VLS FO TFAULT VBRT IBRT VBRT_ADJ VBRT_ADJ VSLEEP VSLEEP IISLEEP VSYNC (HI) VSYNC (LO) ZIN FVSYNC FBURST
Test Conditions
VBRT_ADJ = 2.25V VBRT_ADJ = 2.25V VBRT_ADJ = 0VDC VBRT_ADJ = 2.25VDC
LXM1622-05-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
mARMS mARMS mARMS VRMS KHz SEC VDC ADC ADC VDC VDC VDC VDC A VDC VDC K Hz Hz
VBRT_ADJ = 0VDC VBRT_ADJ = 2.5VDC IO(LAMP) = 100% Duty Cycle IO(LAMP) = Minimum Duty Cycle VIN=4.8V VIN=5.2V SLEEP=5.0V SLEEP=0.0V VIN=4.8V VIN=5.2V
.25 -680 196 2.25 0 1.5 -0.3 400
-710 203
2.2 -730 220 2.5 0.5 VIN 0.5 450
ELECTRICALS ELECTRICALS
0 425 0
1.5 0 27 50 190
0.8 150 310
Output Burst Rate; VSYNC=0V
250
Microsemi
Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
RangeMAX
INTEGRATED PRODUCTS
LXM1622-05-xx
DUAL 5W, DIGITAL DIMMING CCFL INVERTER MODULE
PRELIMINARY DATA SHEET
ELECTRICAL CHARACTERISTICS (CONTINUED)
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Unless otherwise specified, these specifications apply over the recommended operating conditions and 25C ambient temperature for the LMX1622-05-xx.
Parameter
Symbol
Test Conditions
LMX1622-05-xx Min Typ Max
Units
POWER CHARACTERISTICS Run Current (LXM1622-05-01) Run Current (LXM1622-05-02,03)) Sleep Current
IRUN IRUN ISLEEP
VIN=5V,VBRT_ADJ = 2.25V, VLAMP = 625VRMS VIN=5V,VBRT_ADJ = 2.25V, VLAMP = 425VRMS VIN = 5V, SLEEP= 0.0V
0.0
2060 1080 0.5
10
mA mA A
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
FUNCTIONAL PIN DESCRIPTION Conn. Pin Description
CN1 (Molex 53261-0890)* CN1-1,2 VIN Main Input Power Supply (4.75V to 5.25V) CN1-3,4 GND Power Supply Return SLEEP CN1-5 >1.5V (Backlight on), <0.8V (backlight off), IISLEEP=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) Vertical Synchronization Input (50 < fSYNC > 150Hz), minimum pulse width 10uS CN1-8 VSYNC CN2,3 for LMX1622-05-01, 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 VHI length. 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. CN2,3 for LMX1622-05-03 (Honda QZ-19-A3MYL#02) High Voltage Connection to High Side of Lamp. Connect to lamp terminal with shortest lead CN2-3 VHI length. 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.
* LX9501 Mating Connector Assembly Available
PHYSICAL DIMENSIONS
LXM1622-05-XX
All dimensions are in inches (mm)
0.078in.
2mm
4.88in.
124mm
4.69in.
119mm
CN2, CN3 (Connector Type)
PACKAGE DATA PACKAGE DATA
CN1 0.118in.
3mm
0.068in.
1.75mm
1
1.26in.
32mm
SM02(8.0)B-BHS-1-TB (JST)
0.118in. CN2 0.24in.
6mm 3mm0.08
3 CN3
1
Honda QZ-19-AMYL#02 1.89in.
48mm
1.50in.
38mm
0.060in.
1.52mm
Warning
CN3 .299in.
7.6mm
CN2
All PCB Tolerances to 0.5mm
High Voltage Present at all Output Connectors Weight: 24.5 (g) typ.
Copyright 2000 Rev. 0.5f, 2003-01-20
Microsemi
Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
RangeMAX
INTEGRATED PRODUCTS
LXM1622-05-xx
DUAL 5W, DIGITAL DIMMING CCFL INVERTER MODULE
PRELIMINARY DATA SHEET
HOW THE RANGEMAX WORKS
WWW .Microsemi .C OM
LAMP VOLTAGE & LAMP CURRENT - BURST MODE OPERATION
Figure 1 - 50% Burst Duty Cycle
Figure 2 - 5% 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.
High Voltage Transformer V HI
Figure 3 - 5% Burst Duty Cycle (Expanded Time Base)
HIGHLIGHTS
+3.5V
5K
Comparator + Ramp 0.25 2.2V DC V BRITE Transformer Driver
V LO V HI
Ramp Gen. LAMP
V SENSE I SENSE V LO V SYNC
LAMP
*
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.
DESCRIPTION DESCRIPTION
Figure 4 - RangeMAX Simplified Block Diagram
Copyright 2000 Rev. 0.5f, 2003-01-20
Microsemi
Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
RangeMAX
INTEGRATED PRODUCTS
LXM1622-05-xx
DUAL 5W, DIGITAL DIMMING CCFL INVERTER MODULE
PRELIMINARY DATA SHEET
HOW THE RANGEMAX WORKS (CONTINUED)
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HIGHLIGHTS (CONTINUED)
*
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.
TYPICAL APPLICATION
+5V DC V IN
*
BRITE
V HI CCFL TUBE V LO
LXM1622-05-xx BRITE RTN 2.5 SLEEP V SYNC 5V GND
0
V SYNC Figure 5 - Brightness Control
PW M Signal from System P.W .
BRITE
The Brightness control may be a voltage output DAC, digital resistor or a simple 10K potentiometer, 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 VSYNC input. If no video synchronization is desired, connect VSYNC to ground. * If you need to turn the inverter ON/OFF remotely, connect a 2.5V to 5V logic signal to the SLEEP input. If remote ON/OFF is not needed, connect the SLEEP input to VIN or other voltage source between 2.5V and 5V. * 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.
RangeMAX INVERTERS
LXM1622-05-xx
1mS to 200S
0 < P.W. < 100% of period
Figure 5A - PW M Brightness Control
Also available in single lamp inverters LXM1612-xxxx, 12V dual LXM1622-12-xx and Quad Output LXM1641-01 versions for multiple lamp applications.
A APPLICATIONS
Copyright 2000 Rev. 0.5f, 2003-01-20
Microsemi
Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
RangeMAX
INTEGRATED PRODUCTS
LXM1622-05-xx
DUAL 5W, DIGITAL DIMMING CCFL INVERTER MODULE
PRELIMINARY DATA SHEET
LMX1622-05-XX OUTPUT CURRENT ADJUST
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The LMX1622-05-01 output current can be adjusted lower by changing the value of one resistor (R18) on the PCB. The following table shows the new output current values:
Add R18 Output Current
6.5mArms 6.0mArms 5.5mArms 5.0mArms 4.5mArms 4.0mArms 3.5mArms 3.0mArms
The LMX1622-05-02,03 output current can be adjusted lower by changing the value of one resistor (R18) on the PCB. Changing the value of R35 can also increase the output current. The following table shows the new output current values:
Add R18 Output Current
5.5mArms 5.0mArms 4.5mArms 4.0mArms 3.5mArms 3.0mArms
Resistor Value
Not used 1.0M 5% 422K 1% 267K 1% 178K 1% 121K 1% 88.7K 1% 68.1K 1%
Resistor Value
Not used 845K 1%, 374K 1%, 232K 1% 127K 1%, 71.5K 1%
Change R35 Output Current
5.5mArms 6.0mArms 6.5mArms
Resistor Value
576 1% (stock value) 499 1% 442 1%
DRIVING THE BRITE INPUT FROM A HIGH IMPEADANCE
The LMX1622-05-xx comes with a built in 5K pull-up resistor to allow the use of an external potentiometer for brightness adjust. In some cases this pull-up resistor may interfere with those driving the BRITE
input from a high impedance. In this case the internal pullup resistor R44 may be removed from the board. Please use the drawing below to help locate the specified resistor.
COMPONENT DRAWING
CN1 T1 R4 RJ2 R13 RJ4 R1 F1 C6 R11 R10 C1 RJ1 C3 C2 R22 R20 R23
Q2
D1
R5
U2
R51 D8
R7 Q3
R3
Q1
R8 C5
C4
U4
R6
RJ3 R2 R12
APPLICATIONS APPLICATIONS
R9 C12 C13 C14
R46 R15
R45 R33 R35 R47 R48 R53 D5
C7
C30
C24
R36 R37
D3
R54
R30 C20
R52
Q4
R44 R50 R49
U5
C8 R16 R14 C10 C11 R17 C9 RJ5
U1
RJ6 R19
C15 C16 C17 R18
Copyright 2000 Rev. 0.5f, 2003-01-20
Microsemi
Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 6
RangeMAX
INTEGRATED PRODUCTS
LXM1622-05-xx
DUAL 5W, DIGITAL DIMMING CCFL INVERTER MODULE
PRELIMINARY DATA SHEET
NOTES
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NOTES NOTES
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. 0.5f, 2003-01-20
Microsemi
Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 7

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