LXM1610-01 DIRECT DRIVE CCFL INVERTER MODULE T H E I N F I N I T E P O W E R O F I P R O D U C T I O N N N O VA T I O N D A T A S H E E T Not Recommended For New Design 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 invert- K E Y F E AT U R E S ers 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. NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com. Protected by U.S. Patents: 5,923,129; 5,930,121; Patents Pending ■ ■ ■ ■ ■ ■ ■ 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 ■ ■ ■ ■ ■ Notebook And Sub-Notebook Computers Portable Instrumentation Automotive Displays Desktop Displays Airline Entertainment Centers BENEFITS ■ High Efficiency, Line Voltage Regulation And Sleep Mode Extend Computer Battery Life ■ Smooth, Wide-Range Brightness Control Gives Your Product A High Quality Image ■ Output Voltage Regulation Minimizes Corona Discharge For Long Life And High Reliability PRODUCT HIGHLIGHT DIRECT DRIVE OUTPUT ARCHITECTURE VIN SLEEP CCFL BRITE GND ISNS VSNS 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. M O D U L E O R D E R I N F O R M AT I O N LXM1610-01 Copyright © 2001 Rev. 1.1a 01/04 LINFINITY MICROELECTRONICS INC. 11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570 1 P AT E N T P E N D I N G PRODUCT DATABOOK 1996/1997 LXM1610-01 Not Recommended For New Design DIRECT DRIVE CCFL INVERTER MODULE P RO DU C TION D A TA S H E E T A B S O L U T E M A X I M U M R AT I N G S (Note 1) 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 .............................................................................................................................................. 0°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 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 Symbol 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 Recommended Operating Conditions Min. R.C. Max. VIN VIN PO 8 9 VBRT ADJ VLAMP IOLAMP TA 0.0 540 12 12 4 Units 18 16 5 2.5 800 675 7.0 0 V V W V VRMS mARMS °C 70 ELECTRICAL CHARACTERISTICS Unless otherwise specified, these specifications apply over the recommended operating conditions and 25°C ambient temperature for the LXM1610. Parameter Symbol Test Conditions LXM1610-01 Min. Typ. Max. Units 6.3 2.0 1500 52 mA RMS mA RMS VRMS KHz Output Pin Characteristics Full Bright Lamp Current Minimum Lamp Current (Note 2) Lamp Start Voltage Operating Frequency IL (MAX) IL (MIN) VLS fO VBRT ADJ = 2.5VDC, SLEEP = HIGH, VIN = 9VDC VBRT ADJ = 0VDC, SLEEP = HIGH, VIN = 9VDC 0°C < TA < 40°C VBRT ADJ = 2.5VDC, SLEEP = HIGH, VIN = 12VDC 7.0 2.5 57 7.7 3.0 1800 62 BRITE Input Input Current Input Voltage for Max. Lamp Current Input Voltage for Min. Lamp Current IBRT VC VC VBRT ADJ = 0VDC IO (LAMP) = 100% IO (LAMP) = Minimum -62 2.5 0 µADC VDC VDC SLEEP Input RUN Mode SLEEP Mode Input Current VSLEEP (HI) VSLEEP (LO) ISLEEP SLEEP = 5.0V 2.2 -0.3 120 VIN 0.8 180 VDC VDC µADC 10 50 µADC 5.1 10 5.3 VDC Ω Power Characteristics Sleep Current IIN (MIN) VREF Ouput VREF Output Voltage VREF Source Impedance VREF RREF VIN = 15VDC , SLEEP ≤ 0.8V RL ≥ 1MΩ 4.9 Note 2. Minimum lamp current required to maintain even light output may vary with display panel. 2 Copyright © 2001 Rev. 1.1a 01/04 PRODUCT DATABOOK 1996/1997 PATENT PENDING LXM1610-01 Not Recommended For New Design DIRECT DRIVE CCFL INVERTER MODULE P D RO DU C TION A TA S H E E T FUNCTIONAL PIN DESCRIPTION Conn. CN1 Pin Description CN1-1 CN1-2 VIN Input Power Supply. (8V ≤ VIN ≤ 18V) CN1-3 CN1-4 GND Power Supply Return. CN1-5N SLEEP ON/OFF Control. (2.2V < SLEEP < VIN = ON, -0.3V < SLEEP < 0.8V = OFF) CN1-6N BRITE Brightness Control (0 to 2.5VDC). 2.5VDC gives maximum lamp current. CN1-7N AGND Analog Ground. Use for BRITE signal return only. CN1-8N VREF 5.1V Reference Output Voltage. CN2-1N VHI High voltage connection to high side of lamp. Connect to lamp terminal with shortest lead length. DO NOT connect to ground. CN2-2N VLO Connection to low side of lamp. Connect to lamp terminal with longer lead length. DO NOT connect to Ground. CN2 T Y P I C A L A P P L I C AT I O N S 1k 9VDC-18VDC VREF 1k AGND 0V 5V VIN BRITE SLEEP VHI CCFL TUBE LXM1610-01 VLO GND FIGURE 1 — Potentiometer Brightness Control Copyright © 2001 Rev. 1.1a 01/04 3 PRODUCT DATABOOK 1996/1997 P AT E N T P E N D I N G Not Recommended For New Design LXM1610-01 DIRECT DRIVE CCFL INVERTER MODULE P RO DU C TION D A TA S H E E T PHYSICAL DIMENSIONS LXM1610-01 All dimensions are in inches (mm). 3.93 (100) 2.36 (60) 1.20 (30.5) CN1 Ø 0.116 (2.95) Grounded Mounting Hole CN2 2.06 (52.25) 0.15 (3.85) 0.64 (16) 1 .326 Max. (8.3) Warning!! High Voltage Present .031 (0.79) Connectors: CN1 = MOLEX 53261-0890N Recommended Mate: Pins: 50079-8100*, Housing: 51021-0800 CN2 = JST SM02(8.0)B-BHS--1TBN Pins: 5BH-001T-P0.5, Housing: BHR-03VS-1 * Loose (-8000, Chain) Recommended #26 AWG wiring RangeMAX and Direct Drive are trademarks of Linfinity Microelectronics Inc. PRODUCTION DATA - Information contained in this document is proprietary to LinFinity and is current as of publication date. This document may not be modified in any way without the express written consent of LinFinity. Product processing does not neccessarily include testing of all parameters. LinFiniyt reserves the right to change the configuration and performance of the product and to discontinue product at any time. 4 Copyright © 2001 Rev. 1.1a 01/04