LX6512CD-TR

LX6512 TM ® High Performance CCFL Controller P RODUCTION D ATA S HEET DESCRIPTION KEY FEATURES Microsemi’s LX6512 is a cost effective, Direct Drive CCFL (Cold Cathode Fluorescent Lamp) controller. The integrated controller is optimized to drive CCFL’s (Cold Cathode Fluorescent Lamps) using either resonant full bridge inverter topology or push-pull Direct Drive configurations. Resonant full bridge topology provides near sinusoidal waveforms over a wide supply voltage range in order to maximize the life of CCFL lamps, control EMI emissions, and maximize efficiency. This new architecture is also coupled with a wide dimming range capability. For fixed input supply applications the LX6512 uses Direct Drive topology to supply fixed frequency PWM signals connected directly to the high voltage transformer primary via a single pair of NFET drivers, providing a simple, low cost inverter solution. The LX6512 contains safety features that limit the transformer secondary voltage and protect against fault conditions which include open lamp, broken lamp and short-circuit faults. The over voltage fault shutdown is disabled during a user programmable interval to allow lamp strike. The controller can accept a brightness control signal that is either an analog voltage level, or a direct low frequency PWM. Utilizing this signal it provides CCFL brightness dimming control using digital dimming, to achieve a wide dimming range (> 60 to 1). An integrated 4V LDO (Low Dropout Regulator) powers all internal control circuitry and up to 5mA for external circuitry greatly simplifying supply voltage requirements. The LX6512 is available in a 16-Pin SOIC, TSSOP and 3x3 mm 16pin QFN. WWW . Microsemi . C OM • Full Bridge or Direct Drive Push Pull Configurable • Patented Striking Topology • Low Stress to Transformers • Wide Dimming Range • Programmable Operating Dimming Frequency • Programmable Time Out Protection • Fixed Operating Frequency • Open Lamp Voltage Protection, Short Lamp Protection, Over Voltage Protection • Compatible with Existing Transformers APPLICATIONS • • • • • Note Book LCD displays Transportable Computers Web Tablet LCD displays Digital Picture Frame Monitor / TV Portable DVD Player IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com Protected by U.S. Patents: 5,615,093; 5,923,129; 5,930,121; 6,198,234; 7,112,929; Patents Pending CN1 1 2 3 4 5 6 7 8 CON8 R5 115K FUSE F1 C9 10uF VDDA R1 61.9K R7 1M U2 T1 C13 100nF CN2 1 2 CON2 1 C14 C2 100pF 100nF 2 3 4 C3 C5 1uF 3.9nF 5 6 7 8 BRITE_D F_OSC B_OSC ENA C_TO EA_OUT V_SNS ISNS VIN_SNS VDDA VDDP 16 15 14 13 12 11 10 9 VDDA C6 C4 0.1uF 1uF 4 3 2 1 5 6 7 8 C11 2pF PCB AOH U1 LX6512CLQ BOH GND AOL BOL C12 2.2nF R4 374 Ohm LOW COMPONENT COUNT REQUIREMENT FOR TOTAL SYSTEM SOLUTION LX6512 LX6512 PACKAGE ORDER INFO THERMAL DATA TA (°C) D LQ PW Plastic SOIC 16-pin Plastic 3x3 mm QFN 16-pin Plastic TSSOP 16-pin RoHS Compliant / Pb-free θJA = 82.2 °C/W θJA = 33.3°C/W θJA = 99 °C/W THERMAL RESISTANCE-JUNCTION TO AMBIENT -20 to 85 LX6512CD, LX6512CLQ or LX6512CPW Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX6512CD-TR) Junction Temperature Calculation: TJ = TA + (PD x θJA). The θJA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow. Copyright © 2007 Rev. 1.3, 10/22/2009 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 1 TM ® W WW . Microsemi . C OM INFORMATION Thank you for your interest in Microsemi® Analog Mixed Signal products. The full data sheet for this device contains proprietary information. To obtain a copy, please contact your local Microsemi sales representative. The name of your local representative can be obtained at the following link http://www.microsemi.com/contact/contactfind.asp or Contact us directly by sending an email to: IPGdatasheets@microsemi.com Be sure to specify the data sheet you are requesting and include your company name and contact information and or vcard. We look forward to hearing from you. Copyright Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570