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A
MICROSEMI
COMPANY
RangeMAXTM
LXM1615-03-xx
3.6/5V 2W, DIGITAL DIMMING CCFL INVERTER MODULE
PRELIMINARY DATA SHEET
RangeMAXTM 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. 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.

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
W W W .Microsemi .COM
PDA And Sub-Notebook Computers Portable Instrumentation Target 8.4" And Smaller Panels
IMPORTANT: For the most current data, consult MICROSEMI's website: http://www.microsemi.com
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

3 .2 - 4 .2 V
L i-Io n B a tte ry
V B AT T
PD As, D igital C am eras, Video C am corder, Instrum entation, H andheld G P S
F O R L O W E R V O L T AG E L AM P S
CCFL
260 - 380V RMS

F O R H IG H E R V O L T AG E L AM P S
V LAM P
Instrum entation, Sub N otebooks, D igital Picture Fram es
4 .5 - 5 .5 V
CCFL
350 - 515V RMS

LXM1615-03-XX LXM1615-03-XX

PART NUMBER
LXM1615-03-01 LXM1615-03-02 LXM1615-03-03 LXM1615-03-04
OUTPUT CONNECTOR
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
INVERTER MATES DIRECTLY TO PANEL CONNECTORS
BHR-03VS-1 BHSR-02VS-1 QZ-19-3F01 BHR-02VS-1
Copyright (c) 2000 Rev. 0.3d,2000-11-30
Microsemi
Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
A
MICROSEMI
COMPANY
RangeMAXTM
LXM1615-03-xx
3.6/5V 2W, DIGITAL DIMMING CCFL INVERTER MODULE
PRELIMINARY DATA SHEET

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.
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
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

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
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
VSYNC CHARACTERISTICS Logic High Threshold Logic Low Threshold Input Impedance Input Frequency Free Run Frequency
2.2 .8 10 45 400 530
Output Burst Rate; VSYNC=0V
Copyright (c) 2000 Rev. 0.3d,2000-11-30
Microsemi
Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
A
MICROSEMI
COMPANY
Parameter Symbol
RangeMAXTM
LXM1615-03-xx
3.6/5V 2W, DIGITAL DIMMING CCFL INVERTER MODULE
PRELIMINARY DATA SHEET

Unless otherwise specified, these specifications apply over the recommended operating conditions and 25C ambient temperature for the LXM1615-03-xx.
W W W .Microsemi .COM
Test Conditions
VBRT_ADJ = 0V, VLAMP = 270VRMS VBRT_ADJ = 0V, VLAMP = 420VRMS
LXM1615-03-xx Min Typ Max
360 405
Units
mA mA
POWER CHARACTERISTICS Run Current VBATT= 3.6VDC Run Current VBATT= 5.0VDC
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)

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-AMYL#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

SM 02B-BH SS -1-T B (JST )
94m m
C N -1
0.591in. 15m m 0.0984in.
2.5m m
SM 02(8.0)B-BH S-1-T B (JST )
3.70in.
-01
-02
0.492in.
12.5m m
C N -2
0.394in.
10m m
1
-03
1
PACKAGE DATA PACKAGE DATA
-04
H onda Q Z -19-A3M YL #02 SM 02(4.0)B-BH S-1-T B (JST )
2.71in.
69m m
1
1
3
0.181in.
4.6m m
W eight: 5.5 (g) typ.
0.0394in.
1.0m m
Copyright (c) 2000 Rev. 0.3d,2000-11-30
Microsemi
Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
A
MICROSEMI
COMPANY
RangeMAXTM
LXM1615-03-xx
3.6/5V 2W, DIGITAL DIMMING CCFL INVERTER MODULE
PRELIMINARY DATA SHEET

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 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.
- 2% Burst Duty Cycle
! - 2% Burst Duty Cycle (Expanded Time Base)
HIGHLIGHTS
*
C omparator V BR IT E R amp + .25 2.2V D C T ransformer D river
H igh Voltage T ransformer
V HI
R amp G en. I SEN SE V SEN SE
V LO
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
LAM P
DESCRIPTION DESCRIPTION
Copyright (c) 2000 Rev. 0.3d,2000-11-30
Microsemi
Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
A
MICROSEMI
COMPANY
RangeMAXTM
LXM1615-03-xx
3.6/5V 2W, DIGITAL DIMMING CCFL INVERTER MODULE
PRELIMINARY DATA SHEET

HIGHLIGHTS (CONTINUED)
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*
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.

3.2V - 4.2 V or 5 V 3.3V D C +3.3V V BAT T
*
B R IT E
V HI CCFL TUBE V LO
LX M 1 615-03-xx
SYNC V SYN C
GND
F ig u re 5 - B rightness C ontro l
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.
PW M Signal from System
BRIT E
"#
$
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.
P.W .
LXM 1615-03-xx
< 200 S
0 < P.W. < 100% of period
F ig ure 5A - PW M Brightness C ontrol
%&'(!'
)
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: 4.0mArms 3.5mArms 3.0mArms 2.5mArms 2.0mArms 137K 1% (stock setting) 95.3K1% 68.1K1% 49.9K1% 36.5K1%
C N1 R5 C9 R1 C3 R3 R4 C7 R6 C8 C 10 R8 C 11 R7 R9 U1 C6 R2 C1 C5 F1 C 12 C4 D1 C 13 C 14 C 15 C 16 C 17 R 11 R 22
APPLICATION APPLICATION
R 18
R 10
R 19
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 (c) 2000 Rev. 0.3d,2000-11-30
Microsemi
Linfinity Microelectronics Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
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