LX6512A High Performance CCFL Controller ® TM P RODUCT BRIEF DESCRIPTION The LX6512A contains safety features that limit the transformer secondary voltage and protect against fault conditions including open lamp or broken lamp, over voltage, arcing, and short-circuit fault. In addition, a programmable strike time out allows the user to set suitable strike time for a successful lamp strike for different applications. The controller also provides convenient means for lamp brightness control. With the programmable dimming frequency oscillator, it allows to use an analog DC input to perform a digital dimming at the programmed frequency. Alternatively, an external PWM signal can also be applied to the dimming control pin to achieve a direct digital dimming control. An integrated 4V LDO (Low Dropout Regulator) supplies all the internal control circuit and up to 5mA to the external circuitry to minimize the external voltage supply requirement. The LX6512A is available in a 16-Pin SOIC package. Full Bridge or Direct Drive Push Pull Configurable Patented Striking Technology 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 Transformer Designs W W W . Microsemi .CO M Microsemi’s LX6512A is a cost effective, high performance 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 configuration. Resonant full bridge topology provides soft switching performance that helps to achieve near sinusoidal waveforms over a wide input voltage range, maximize the life of CCFL lamps, lower switching noise and EMI emissions, and maximize the inverter operating efficiency. This architecture is also coupled with a quiet operation over wide dimming range. For narrow range input applications the drive signal format of LX6512A allows the user to configure a push-pull circuit. Only a single pair of N-FET is needed to be driven by the signals from LX6512A directly and thus providing a simple, low cost inverter solution. KEY FEATURES APPLICATIONS Note Book LCD displays Transportable Computers Web Tablet LCD displays Digital Picture Frame Monitor / TV applications 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 FUSE F1 1 2 3 4 5 6 7 8 C9 VDDA R5 115K R1 R7 2 3 C14 100pF C2 100nF U2 61.9K 1M 1 C6 0.1uF 10uF 4 5 6 1uF 7 C5 3.9nF 8 VDDA VDDP VIN_SNS AOH BRITE_D BOH F_OSC GND LX6512A B_OSC AOL ENA BOL C_TO ISNS EA_OUT V_SNS 16 C4 1uF 4 5 15 3 6 14 2 7 13 1 8 T1 CN2 C13 100nF R8 1 2 10M R9 12 10K 11 10 LX6512A C3 U1 R4 9 374 Ohm LOW COMPONENT COUNT REQUIREMENT FOR TOTAL SYSTEM SOLUTION PACKAGE ORDER INFO TA (C) -20 to 85 D THERMAL DATA Plastic SOIC 16-pin THERMAL RESISTANCE-JUNCTION TO AMBIENT LX6512ACD Junction Temperature Calculation: TJ = TA + (PD x JA). The JA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow. Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX6512ACD-TR) Copyright 2010 Rev. 1.0, 7/2/2010 JA = 82.2 C/W RoHS Compliant / Pb-free Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 1 LX6512A TM ® High Performance CCFL Controller P RODUCT BRIEF ABSOLUTE MAXIMUM RATINGS VIN_SNS AOH BRITE_D BOH F_OSC B_OSC ENABLE Notes: 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. VDDP C_TO GND AOL BOL I_SNS EA_OUT W W W . Microsemi .CO M VDDA MSC LX6512ACD xxxx Supply Input Voltage (VDDP) ...........................................................................................-0.3V to 7V Digital Inputs (ENABLE)................................................................................................-0.3V to 5.5V Analog Inputs (I_SNS, V_SNS) ............................................. +/- 14V. Max peak current +/-100mA Analog Inputs ( BRITE_D, VIN_SNS, F_OSC, B_OSC) ............................................. -0.3V to 5.5V Analog Outputs (EA_OUT,C_TO) .................................................................................-0.3V to 5.5V Analog Output (VDDA) .................................................................................................-0.3V to 5.5V Driver Outputs (AOL, AOH, BOL, BOH) ......................................................................-0.3V to 5.5V Maximum Operating Junction Temperature ................................................................................150C Storage Temperature Range.......................................................................................... -65C to 150C Lead Temperature (Soldering 10 seconds....................................................................................300C Package Peak Temp. for Solder Reflow (40 seconds maximum exposure)......................260°C (+0 -5) PACKAGE PIN OUT V_SNS D PACKAGE (Top View) RoHS/Pb-free 100% matte Tin Finish xxxx = date code / lot identifier LX6512A Copyright 2010 Rev. 1.0, 7/2/2010 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 2