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LIN DOC #: 1610
LXM1610-01
DIRECT DRIVE CCFL INVERTER MODULE
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DESCRIPTION Single Output Inverter Ideal For Portable Applications. The LXM1610 series of Direct DriveTM CCFL (Cold Cathode Fluorescent Lamp) Inverter Modules are specifically designed for driving LCD backlight lamps. They excel in applications where critical parameters include dimmability, high efficiency and reliable fail-safe design in a small form factor. These inverters are recommended for use in panels with low-voltage insulation on the lamp return wire. Wide Input Voltage Range. The modules convert unregulated DC voltage from the system battery or AC adapter directly to high-frequency, high-voltage waves required to ignite and operate CCFL lamps. Input voltage can range from 8 to 18 volts. Direct Drive Technology. The module design is based on a new Direct Drive topology, which provides a number of cost and performance advantages. The LXM1610-01 series Direct Drive inverters eliminate the classic resonant inductor and capacitors, thus reducing cost and allowing a 30% reduction in module size. Fixed-Frequency Operation. Other benefits of this new topology are fixedfrequency operation and secondary-side strike-voltage regulation. Strike-voltage regulation minimizes corona discharge in the output transformer and related circuitry, providing longer life and higher reliability. Dimming Features. The LXM1610 modules are equipped with a dimming input that permits brightness control from an external potentiometer or DC voltage. In addition, the sleep input reduces module power to a few microwatts in shut down mode. All LXM1610 modules feature both output open and short-circuit protection. The LXM1610 is fully customizable (electronically and mechanically) to specific customer requirements.
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K E Y F E AT U R E S
8V to 18V Input Voltage Range 30% Smaller Than CS-ZVS Models Versatile Brightness Control Input MicroAmp SLEEP Mode Open And Shorted Lamp Protection 8.3mm Max. Module Height, 16mm Width Fixed Frequency Operation
A P P L I C AT I O N S
s s s s s Notebook And Sub-Notebook Computers Portable Instrumentation Automotive Displays Desktop Displays Airline Entertainment Centers
BENEFITS
s High Efficiency, Line Voltage Regulation And Sleep Mode Extend Computer Battery Life s Smooth, Wide-Range Brightness Control Gives Your Product A High Quality Image s Output Voltage Regulation Minimizes Corona Discharge For Long Life And High Reliability
NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.
PRODUCT HIGHLIGHT
DIRECT DRIVE OUTPUT ARCHITECTURE
VIN SLEEP
Direct Drive architecture includes two load feedback control loops to provide uncompromised CCFL ignition and operation characteristics. Lamp current is regulated in the CCFL return lead (ISNS loop) to insure constant light output with changing lamp parameters and power supply voltage. This also allows accurate and repeatable brightness control. Dimming ratio with the LX1610 analog dimming inverters is typically 5:1 when driving 12.1 to 15 inch LCD panels. If no current flows in the CCFL return path because of an unstruck or failed lamp, the inverter applies full strike voltage potential. The output voltage feedback loop (VSNS) takes control and regulates output voltage to 1650VRMS. This insures the lamp will ignite under worst case temperature and aging conditions. Because output voltage is actively regulated, it will never exceed component and panel insulation ratings. This prevents destructive corona discharge to insure long term reliability of the system.
GND
ISNS
VSNS
M O D U L E O R D E R I N F O R M AT I O N
LXM1610-01
Copyright (c) 1999 Rev. 0.4 8/99
LINFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
CCFL
BRITE
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P AT E N T P E N D I N G
PRODUCT DATABOOK 1996/1997
LXM1610-01
DIRECT DRIVE CCFL INVERTER MODULE
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(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 (VIN) ........................................................................................................................................................ -0.3V to 18V Output Voltage, no load .............................................................................................................................. Internally Limited to 1800VRMS Output Current ............................................................................................................................................. 10.0mARMS (Internally Limited) Output Power ........................................................................................................................................................................................ 6.0W Input Signal Voltage, (SLEEP and BRITE Inputs) ..................................................................................................................... -0.3V to VIN Ambient Operating Temperature .............................................................................................................................................. 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 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 (Functional) Input Supply Voltage (Fully Regulated Lamp Current) Output Power Brightness Control Input Voltage Range Lamp Operating Voltage Lamp Current - Full Brightness Operating Ambient Temperature Range
Symbol
VIN VIN PO VBRT ADJ VLAMP IOLAMP TA
Recommended Operating Conditions Min. R.C. Max.
8 9 0.0 300 0 12 12 4 675 7.0 18 16 5 2.5 800 70
Units
V V W V VRMS mARMS C
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, these specifications apply over the recommended operating conditions and 25C ambient temperature for the LXM1610.
Parameter Output Pin Characteristics
Full Bright Lamp Current Minimum Lamp Current (Note 2) Lamp Start Voltage Operating Frequency
Symbol
Test Conditions
LXM1610-01 Min. Typ. Max.
6.3 2.0 1500 52 7.0 2.5 57 -62 2.5 0 2.2 -0.3 120 10 4.9 5.1 10 VIN 0.8 180 50 5.3 7.7 3.0 1800 62
Units
IL (MAX) IL (MIN) VLS fO IBRT VC VC
VBRT ADJ = 2.5VDC, SLEEP = HIGH, VIN = 9VDC VBRT ADJ = 0VDC, SLEEP = HIGH, VIN = 9VDC 0C < TA < 40C VBRT ADJ = 2.5VDC, SLEEP = HIGH, VIN = 12VDC VBRT ADJ = 0VDC IO (LAMP) = 100% IO (LAMP) = Minimum
mARMS mARMS VRMS KHz ADC VDC VDC VDC VDC ADC ADC VDC
BRITE Input
Input Current Input Voltage for Max. Lamp Current Input Voltage for Min. Lamp Current
SLEEP Input
RUN Mode SLEEP Mode Input Current VSLEEP (HI) VSLEEP (LO) ISLEEP SLEEP = 5.0V IIN (MIN) VREF RREF VIN = 15VDC , SLEEP 0.8V RL 1M
Power Characteristics
Sleep Current
VREF Ouput
VREF Output Voltage VREF Source Impedance
Note 2. Minimum lamp current required to maintain even light output may vary with display panel.
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Copyright (c) 1999 Rev. 0.4 8/99
PRODUCT DATABOOK 1996/1997
PATENT PENDING
LXM1610-01
DIRECT DRIVE CCFL INVERTER MODULE
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FUNCTIONAL PIN DESCRIPTION
Conn. CN1
CN1-1 CN1-2 CN1-3 CN1-4 CN1-5 CN1-6 CN1-7 CN1-8
Pin
Description
VIN GND SLEEP BRITE AGND VREF
Input Power Supply. (8V VIN 18V) Power Supply Return. ON/OFF Control. (2.2V < SLEEP < VIN = ON, -0.3V < SLEEP < 0.8V = OFF) Brightness Control (0 to 2.5VDC). 2.5VDC gives maximum lamp current. Analog Ground. Use for BRITE signal return only. 5.1V Reference Output Voltage.
CN2
CN2-1 CN2-2 VHI VLO High voltage connection to high side of lamp. Connect to lamp terminal with shortest lead length. DO NOT connect to ground. Connection to low side of lamp. Connect to lamp terminal with longer lead length. DO NOT connect to Ground.
T Y P I C A L A P P L I C AT I O N S
1k 9VDC-18VDC VREF 1k BRITE AGND VIN
VHI CCFL TUBE VLO
LXM1610-01
0V
5V
SLEEP
GND
FIGURE 1 -- Potentiometer Brightness Control
Copyright (c) 1999 Rev. 0.4 8/99
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P AT E N T P E N D I N G
PRODUCT DATABOOK 1996/1997
LXM1610-01
DIRECT DRIVE CCFL INVERTER MODULE
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RELIMINARY
D
ATA
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PHYSICAL DIMENSIONS
LXM1610-01
All dimensions are in inches (mm).
3.93 (100) 2.36 (60) 2.06 (52.25) 1.20 (30.5)
CN2
CN1
O 0.116 (2.95) Grounded Mounting Hole
0.15 (3.85)
0.64 (16) 1
.326 Max. (8.3)
Warning!! High Voltage Present
.031 (0.79)
Connectors: CN1 = MOLEX 53261-0890 CN2 = JST SM02(8.0)B-BHS--1TB
Recommended Mate: Pins: 50079-8100*, Housing: 51021-0800
* Loose (-8000, Chain) Recommended #26 AWG wiring
Pins: 5BH-001T-P0.5, Housing: BHR-03VS-1
RangeMAX and Direct Drive are trademarks of Linfinity Microelectronics Inc.
PRELIMINARY DATA - Information contained in this document is pre-production data, and is proprietary to LinFinity. It may not 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.
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Copyright (c) 1999 Rev. 0.4 8/99

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