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RangeMAX
INTEGRATED PRODUCTS
LXM1615-03-xx
3.6/5V 2W, DIGITAL DIMMING CCFL INVERTER MODULE
PRELIMINARY DATA SHEET
DESCRIPTION
KEY FEATURES
WWW .Microsemi .C OM
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.
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. 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.
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 UL60950 E175910
APPLICATIONS
PDA And Sub-Notebook Computers Portable Instrumentation Target 8.4" And Smaller Panels
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
PDAs, Digital Cameras, Video Camcorder, Instrumentation, Handheld GPS
3.2 - 4.2V
Li-Ion Battery
VBATT
FOR LOWER VOLTAGE LAMPS LXM1615 FOR HIGHER VOLTAGE LAMPS
VLAMP
CCFL
260 - 380VRMS
Instrumentation, Sub Notebooks, Digital Picture Frames
4.5 - 5.5V
CCFL
350 - 515VRMS
ONE INVERTER SUPPORTS EITHER VOLTAGE RANGE
LXM1615-03-XX LXM1615-03-XX
PART NUMBER
LXM1615-03-01 LXM1615-03-02 LXM1615-03-03 LXM1615-03-04
MODULE ORDER INFO INVERTER MATES DIRECTLY OUTPUT CONNECTOR TO PANEL CONNECTORS
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
Copyright 2000 Rev. 0.3f,2003-01-16
Microsemi
Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
RangeMAX
INTEGRATED PRODUCTS
LXM1615-03-xx
3.6/5V 2W, DIGITAL DIMMING CCFL INVERTER MODULE
PRELIMINARY DATA SHEET
ABSOLUTE MAXIMUM RATINGS
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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......................................................................................................0C to 70C Storage Temperature Range.............................................................................................................................-40C to 85C
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.
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
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
Symbol
+3.3 VBATT VBATT PO PO VBRT_ADJ VLAMP VLAMP IOLAMP TA
Recommended Operating Conditions Min R.C. Max
3.1 3.2 4.5 1 1.5 0.0 260 350 0 3.3 3.6 5.0 1.2 1.7 305 445 4.0 3.5 4.2 5.5 1.5 2 2.2 380 515 70
Units
V V V W W V VRMS VRMS mARMS C
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, these specifications apply over the recommended operating conditions and 25C 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 Input Current VSYNC CHARACTERISTICS Logic High Threshold Logic Low Threshold Input Impedance Input Frequency Free Run Frequency Copyright 2000 Rev. 0.3f,2003-01-16
Symbol
IL(MAX) IL(MIN) VLS FO VBRT IBRT VBRT_ADJ VBRT_ADJ ENABLE DISABLE IINRUN IINPK VSYNC (HI) VSYNC (LO) ZIN FVSYNC FBURST
Test Conditions
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
LXM1615-03-xx Min Typ Max
3.5 1250 80 .25 -21 250 0 2.2 3.1 -0.3 4.0 .08 1400 90 4.5 1800 100 2.2 -41 290 .25 2.5 3.5 2.7 20
Units
mARMS mARMS VRMS KHz VDC ADC ADC VDC VDC VDC VDC mA VDC VDC K Hz Hz Page 2
VBRT_ADJ = 0VDC VBRT_ADJ = 2.5VDC IO(LAMP) = 100% Duty Cycle IO(LAMP) = Minimum Duty Cycle +3.3V = High +3.3V = Low +3.3V 5% +3.3V = 3.3V 5% +3.3V = 3.3V 5%
-27 268
ELECTRICALS ELECTRICALS
3.3 0.0 10 100
2.2 .8 10 45 400 530
Output Burst Rate; VSYNC=0V
Microsemi
Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
RangeMAX
INTEGRATED PRODUCTS
LXM1615-03-xx
3.6/5V 2W, DIGITAL DIMMING CCFL INVERTER MODULE
PRELIMINARY DATA SHEET
ELECTRICAL CHARACTERISTICS (CONTINUED)
WWW .Microsemi .C OM
Unless otherwise specified, these specifications apply over the recommended operating conditions and 25C ambient temperature for the LXM1615-03-xx.
Parameter
POWER CHARACTERISTICS Run Current VBATT= 3.6VDC Run Current VBATT= 5.0VDC
Symbol
Test Conditions
VBRT_ADJ = 0V, VLAMP = 270VRMS VBRT_ADJ = 0V, VLAMP = 420VRMS
LXM1615-03-xx Min Typ Max
360 405
Units
mA mA
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 4.0mARMS)
FUNCTIONAL PIN DESCRIPTION Conn. Pin Description
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-A3MYL#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
PHYSICAL DIMENSIONS
CN-1
0.591in. 15mm 0.0984in.
2.5mm
0.492in.
12.5mm
CN-2 1 -03 1 3
1
69mm
1
0.181in.
4.6mm PCB tolerances 0.5mm
Weight: 5.5 (g) typ.
0.0394in.
1.0mm
Copyright 2000 Rev. 0.3f,2003-01-16
Microsemi
Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
SM02(4.0)B-BHS-1-TB (JST)
10mm
2.71in.
Honda QZ-19-A3MYL #02
0.394in.
Grounded Mouting Holes 3.18mm 0.0 DIA
SM02B-BHSS-1-TB (JST)
94mm
SM02(8.0)B-BHS-1-TB (JST)
3.70in.
-01
-02
PACKAGE DATA PACKAGE DATA
-04
Page 3
RangeMAX
INTEGRATED PRODUCTS
LXM1615-03-xx
3.6/5V 2W, DIGITAL DIMMING CCFL INVERTER MODULE
PRELIMINARY DATA SHEET
HOW THE RANGEMAX WORKS
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LAMP VOLTAGE & LAMP CURRENT - BURST MODE OPERATION
Figure 1 - 50% Burst Duty Cycle
Figure 2 - 2% 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.
Figure 3 - 2% Burst Duty Cycle (Expanded Time Base)
HIGHLIGHTS
*
Comparator VBRITE Ramp .25 2.2VDC + Ramp Gen. ISENSE VSENSE Transformer Driver
High Voltage Transformer
VHI
VLO
Figure 4 - RangeMAX Simplified Block Diagram
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.
Page 4
LAMP
DESCRIPTION DESCRIPTION
Copyright 2000 Rev. 0.3f,2003-01-16
Microsemi
Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
RangeMAX
INTEGRATED PRODUCTS
LXM1615-03-xx
3.6/5V 2W, DIGITAL DIMMING CCFL INVERTER MODULE
PRELIMINARY DATA SHEET
HOW THE RANGEMAX WORKS (CONTINUED)
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HIGHLIGHTS (CONTINUED)
*
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
3.2V - 4.2V or 5V 3.3V DC +3.3V V BAT T
*
BRITE
V HI CCFL TUBE V LO
LXM1615-03-xx
SYNC V SYNC
GND
Figure 5 - Brightness Control
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.
RangeMAX INVERTERS
PW M Signal from System P.W .
BRITE
LXM1615-03-xx
< 200S
0 < P.W. < 100% of period
Figure 5A - PW M Brightness Control
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.
LXM1615-03-XX OUTPUT CURRENT ADJUST
C1
C3
4.0mArms 3.5mArms 3.0mArms 2.5mArms 2.0mArms
137K 1% (stock setting) 95.3K1% 68.1K1% 49.9K1% 36.5K1%
CN1 R5 C9
R3 R4
C6
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:
R1 R2
C5
F1
C12 C4
D1 C13 C14 R22
APPLICATION APPLICATION
C7 R6 C8 C10 R8 C11
U1
C15 C16 C17 R11
R7
R9
R18 R19
R10
Copyright 2000 Rev. 0.3f,2003-01-16
Microsemi
Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
RangeMAX
INTEGRATED PRODUCTS
LXM1615-03-xx
3.6/5V 2W, DIGITAL DIMMING CCFL INVERTER MODULE
PRELIMINARY DATA SHEET
NOTES
WWW .Microsemi .C OM
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. 0.3f,2003-01-16
Microsemi
Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
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