LX1691 Enhanced Multi-Mode CCFL Controller ® TM P RODUCTION D ATA S HEET KEY FEATURES DESCRIPTION Microsemi’s proven and patented Direct Drive architecture works with system voltages from 3 volts to more than 50 volts, limited only by the external power FET’s that drive the high voltage transformer. The LX1691 includes the Microsemi proven and patented strike method that allows significant efficiency gains while guaranteeing strong striking power at all operating temperatures. Our method sweeps strike frequency smoothly up to the unloaded resonant frequency of the lamp and high voltage transformer. This, coupled with the LX1691’s active high output voltage regulation, produces just enough strike voltage without generating unpredictable high voltage spikes that cause arcing and component failures. Competitive devices that simply switch to a higher frequency for striking do not have this “real time” control over output voltage, and require much more attention to transformer design. Simultaneous Amplitude And Duty Cycle Dimming Modes Resistor Programmable Min and Max Lamp Currents Digital Dimming Can Synch To External Or Internal Clocks 100 ms Power On Delay Open Or Shorted Lamp Regulation & Shutdown “On Chip” Full Wave Lamp Current & Voltage Rectifiers 16 Pin TSSOP Package Very Stable Oscillator with OnChip Timing Capacitor Soft Start-Up Striking Enhanced Digital Dimming Resolution WWW . Microsemi .C OM Microsemi’s LX1691 is a cost reduced, enhanced feature set, Direct Drive CCFL (Cold Cathode Fluorescent Lamp) Controller. Its architecture is based on the very popular LX1689. By limiting VDDP to 5.5V and using advanced processing, die size and package pin count is decreased while improving dimming precision. LX1691 based inverter modules can be designed for virtually any CCFL appliance from digital cameras and PDA’s to big screen monitors and driver viewable automotive displays. New versatile dimming circuitry can accept digital and analog control inputs and provides six different dimming modes that control both lamp current amplitude and duty cycle, either simultaneously or separately. Designers can select normal or reverse polarity dimming and precisely program minimum and maximum lamp currents with resistors. The LX1691 fault shutdown feature is enhanced to include regulation and shutdown for over voltage and over current conditions. BENEFITS Low Component Count / Module Cost / And Size High “Nits/Watt” Efficiency Operates Directly From a Single Li-Ion Cell Industries Safest And Highest Performing Strike Voltage Generation (Patented) Tight Operating Frequency Tolerance For Easier System Level RFI Control 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; Patents Pending PRODUCT HIGHLIGHT Traditional Analog Lamp Current (mA) VDC VDC Lamp Current (mA) + BRITE_IN T Lamp Current (mA) + BRITE_IN DD_CLK _ 0 T1 T2 DD_CLK T T1 LX1691 T Direct PWM (Analog) 2 +3V T = 512 / Lamp Frequency _ T = 512 / DD_CLK Frequency VDC VDC 2 + DD_CLK T _ T2 T1 Internal Digital Lamp Current (mA) BRITE_IN 0 DD_CLK T2 External Digital 2 +3V 0 T1 0 + BRITE_IN 2 _ T2 Four of Six Dimming Modes PACKAGE ORDER INFO TA (°C) MIN VDDP MAX VDDP -40 to +85 2.8V 5.5V PW Plastic TSSOP 16-PIN RoHS compliant / Pb-free LX1691IPW Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1691IPW-TR) Copyright © 2003 Rev. 1.1, 1/26/2005 Microsemi Integrated Products 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 1 TM ® For a complete copy of this data sheet please contact your Microsemi sales representative @ http://www.microsemi.com/contact/contactfind.asp or contact us directly at [email protected]. Please include your contact information or vcard in your email. Copyright Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 WWW . Microsemi .C OM INFORMATION