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LXM1653-01 Dataheets PDF



Part Number LXM1653-01
Manufacturers Microsemi Corporation
Logo Microsemi Corporation
Description FLOATING OUTPUT DRIVE/ CCFL INVERTER MODULES
Datasheet LXM1653-01 DatasheetLXM1653-01 Datasheet (PDF)

P A T E N T P E N D I N G LIN D O C #: 1653 LXM1653-01 F L OAT I N G O U T P U T D RIV E , CCFL I NVER TER M O D U L E S T H E I N F I N I T E P O W E R O F I N N O VA T I O N P R E L I M I N A R Y D A T A S H E E T DESCRIPTION The LXM1653 floating output drive CCFL (Cold Cathode Fluorescent Lamp) Inverter Module is specifically designed to drive large LCD displays (11.3" and larger), which are used in notebook computers. This new inverter was specifically designed to reduce t.

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P A T E N T P E N D I N G LIN D O C #: 1653 LXM1653-01 F L OAT I N G O U T P U T D RIV E , CCFL I NVER TER M O D U L E S T H E I N F I N I T E P O W E R O F I N N O VA T I O N P R E L I M I N A R Y D A T A S H E E T DESCRIPTION The LXM1653 floating output drive CCFL (Cold Cathode Fluorescent Lamp) Inverter Module is specifically designed to drive large LCD displays (11.3" and larger), which are used in notebook computers. This new inverter was specifically designed to reduce the leakage currents from the lamp to the reflector or the metal frame of the panels. The floating output architecture of this inverter also permits a much wider dimming range when compared to non-floating designs, and allows an additional 10% efficiency improvement. The module converts unregulated DC voltage from the system battery or AC adapter directly to high-frequency, high-voltage sine waves required to ignite and operate CCFL lamps. The module design is based on a proprietary Linfinity IC that provides important new performance advances. Remarkable improvements in efficiency and RF emissions result from this single stage resonant inverter, featuring a patented Current Synchronous, Zero Voltage Switching (CS-ZVS) topology. CS-ZVS produces nearly pure sine wave currents in the lamp, enabling maximum light delivery, while reducing both conducted and radiated noise. This topology simultaneously performs two tasks including line voltage regulation and lamp dimming through lamp current regulation. These two functions are performed in a single power stage made up of a pair of low-loss MOSFETs. The MOSFETs drive a low current resonant circuit that feeds the primary of a high-voltage transformer with a sinusoidal voltage. Required L and C values in the resonant circuit are such that very lowloss components can be used to obtain higher electrical efficiency than is possible with previous topologies. The full-bridge LXM1653 provides peak efficiency when operated at input voltages from 6.5 volts to 18 volts. In addition, this module is equipped with a dimming input that permits full range brightness control from an external potentiometer or PWM signal, and a sleep input that reduces module power to a few microwatts in shutdown mode. Output open and short circuit protection are also featured on this module. K E Y F E AT U R E S s FULLY FLOATING OUTPUT s 35% MORE LIGHT OUTPUT AT 5 WATTS s GREATER EFFICIENCY THAN GROUNDED OUTPUT DESIGNS s 6.5V TO 18V INPUT VOLTAGE RANGE s VERSATILE BRIGHTNESS CONTROL INPUT s 10 MICROAMP SLEEP CURRENT s OUTPUT SHORT CIRCUIT PROTECTION AND AUTOMATIC OVER VOLTAGE LIMITING s 7.4mm MAX HEIGHT, NARROW FOOTPRINT s MINIMIZE THERMOMETER EFFECTS s MINIMIZE LAMP TO PANEL LEAKAGE CURRENT A P P L I C AT I O N S s 11.3" LCD PANELS AND LARGER s NOTEBOOK AND SUB-NOTEBOOK COMPUTERS s PORTABLE INSTRUMENTATION s AUTOMOTIVE DISPLAYS s DESKTOP DISPLAYS s AIRLINE ENTERTAINMENT CENTERS BENEFITS s ULTRA-HIGH EFFICIENCY, LINE VOLTAGE REGULATION AND SLEEP MODE EXTEND COMPUTER BATTERY LIFE s COOL OPERATION PERMITS CLOSE PROXIMITY TO LCD PANEL WITHOUT DISPLAY DISTORTION s SMOOTH, FULL-RANGE BRIGHTNESS CONTROL GIVES YOUR PRODUCT A HIGH QUALITY IMAGE s LOW EMI / RFI DESIGN MINIMIZES SHIELDING REQUIREMENTS s NARROW, LOW-PROFILE MODULE FITS INTO MOST LCD ENCLOSURES PRODUCT HIGHLIGHT FLOATING OUTPUT A RCHITECTURE High Voltage Transformer CS-ZVS Inverter DC VIN MODULE ORDER CCFL INFO FULL-BRIDGE DRIVE LXM1653-01 F O R F U R T H E R I N F O R M AT I O N C A L L ( 7 1 4 ) 8 9 8 - 8 1 2 1 Copyright © 1997 Rev. 0.1 3/97 11861 WESTERN A VENUE , G ARDEN G ROVE , CA. 92841 1 P AT E N T P E N D I N G PRODUCT DATABOOK 1996/1997 LXM1653-01 F L O AT I N G O U T P U T D RIV E , CCFL I NVERTER M O D U L E S P R E L I M I N A R Y D A T A S H E E T (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)......................................................................................................................................................... 6.5V to 18V Output Voltage, no load .............................................................................................................................. Internally Limited to 2000VRMS Output Current .............................................................................................................................................. 7.5mARMS (Internally Limited) Output Power ........................................................................................................................................................................................... 6W Input Signal Voltage, (SLEEP and BRITE Inputs) .................................................................................................................. -0.3V to 6.5V Ambient Operating Temperature, zero airflow ........................................................................................................................ 0°C to 60°C Storage Temperature R.


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