LX1699

LX1699 TM ® High Performance CCFL Controller P RODUCTION D ATASHEET DESCRIPTION KEY FEATURES • Microsemi Patented Direct Drive TM or Full Bridge Configurable • 6.5 to 24 Volts Wide Input Voltage Range • Supports Intel TM DPST for System PWM Input • Compatible with Microsemi’s New SMBus CCFL Controllers • Fully Programmable Open Lamp and Load Fault Time Outs • Detects and Shuts Down for all Common Lamp Faults • On Chip Full Wave Rectifiers for Lamp Voltage and Current • Uses Industry Standard High Voltage Transformers APPLICATIONS • Note Book LCD Displays • Transportable Computers • Web Tablet LCD displays The LX1699 is a high performance CCFL The LX1699 has improved lamp current (Cold Cathode Fluorescent Lamp) accuracy, fully programmable lamp controller optimized for wide input voltage frequency and burst dimming frequency range display backlighting applications. oscillators, and Microsemi’s patented fullproof lamp strike circuitry. The LX1699 brightness control architecture supports Intel’s DPST Programmable open lamp strike timeout (Display Power Saving Technology) that and open lamp, short lamp, and over adjusts the brightness as a function of voltage fault detection are fully video content. implemented. The controller includes a built-in reference voltage regulator so it can be operated directly from the battery without the need of an external 5V supply from the system. The LX1699 power stage is full bridge driven and includes DC coupled high side drivers on chip for the external P-channel high side and N-channel low side power MOSFETs. Also for fixed input supply applications the IC may be used as a Direct Drive CCFL controller connected directly to the high voltage transformer primary via a single pair of N-FET drivers. Reverse analog dimming control is provided to set the lamp current from maximum lamp current to max -1.8mArms range. Digital Dimming duty cycle is controlled by providing either a DC voltage or a PWM signal to the BRITE_D pin. Burst frequency can be controlled by either by the on chip precision oscillator or directly by a logic signal at BRITE_D. The LX1699 is available in the 20 pin 4 x 4mm QFN surface mount packages. Operating temperature ranges is -20’C ~ 70’C. W WW . Microsemi . C OM IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com Patents Pending PRODUCT HIGHLIGHT JST SM07 B-SRSS-TB-G CN1 INV_PWR INV_PWR INV_PWM DISOFF# DAC_BRIG GND GND 1 2 3 4 5 6 7 10K R8 10K R7 220pF C7 1K R5 4.7nF C8 100K R14 NU C9 100nF C10 1.0uF C11 R11 1K F1 1.5A 24V VDD 76.8K NU NU VBAT C1 4.7uF 25V 3 AM4542C U3B 4 3 AOH 5 6 4 AM4542C U2B 1M R10 R4 R6 R9 VDD R3 511K U1 F_OSC ENABLE EA_OUT BRITE_A BRITE_D VCOMP C_TO I_SNS V_SNS PGND LX1699CLQ B_OSC VIN_SNS AGND VDD VBAT VP5 AOH BOH AOL BOL 47K R2 33nF C6 220pF C5 BOH 5 6 1 2 3 4 5 6 7 8 9 10 20 19 18 10K R13 C15 1uF VBS 1 2 7 8 AM4542C U2A T1 TMP SIT24220-0839 4 JST SM02 B-BHSS-1-TB(LF)(SN) 100nF C17 SM02 CN2 1 2 VAS VDD 470nF C4 100nF C2 C3 470nF AM4542C U3A 2 7 8 5 3 CI-8.5 24:2200 C16 15pF 3KV 17 16 15 14 13 12 11 BOL AOL 1 2 1 VSNS ISNS C12 R12 340 Ohm AOH BOH AOL BOL C13 10nF C14 4.7nF NU ISNS VSNS LX1699 LX1699 PACKAGE ORDER INFO THERMAL DATA TA (°C) -20 to 70 LQ Plastic 4x4 mm QFN 20-pin RoHS Compliant / Pb-free θJA = 31 °C/W THERMAL RESISTANCE-JUNCTION TO AMBIENT LX1699CLQ Microsemi Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1699CLQ-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 © 2009 Rev. 1.0a, 2009-02-05 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