LX1691A Enhanced Multi-Mode CCFL Controller ® TM P RODUCTION D ATA S HEET KEY FEATURES DESCRIPTION Our method sweeps strike frequency smoothly up to the unloaded resonant frequency of the lamp and high voltage transformer. This, coupled with the LX1691A’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. The LX1691A is optimized for wide input voltage applications. It is identical to the LX1691 except it has a guaranteed minimum lamp strike interval of one second to meet notebook and monitor panel manufacturer’s specifications. The LX1691A includes feed forward compensation that provides improved regulation and transient response over an 7 – 24 volt input supply range. The LX1691A can also be used with a fixed input supply and will produce performance equal to that of the LX1691. Simultaneous Amplitude And Duty Cycle Dimming Modes Resistor programmable min and max lamp currents Digital Dimming Can Synch To External Or Internal Clocks 120 ms Power On Delay Open Or Shorted Lamp Regulation & Shutdown “On Chip” Full Wave Lamp Current Rectifier 16 Pin TSSOP Package Very Stable Oscillator with OnChip timing capacitor Enhanced Digital Dimming Resolution Wide Input Voltage Capable WWW . Microsemi .C OM Mircrosemi’s LX1691A is an enhanced Direct Drive CCFL (Cold Cathode Fluorescent Lamp) Controller. Its architecture is based on the LX1691. LX1691A 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 mini-mum and maximum lamp currents with resistors. The LX1691A fault shutdown feature is enhanced to include regulation and shutdown for over voltage and over current conditions. The LX1691A includes the Microsemi proven and patented strike method that allows significant efficiency gains while guaranteeing strong striking power at all operating temperatures. 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) _ T2 VDC T1 Internal Digital Lamp Current (mA) + BRITE_IN _ T = 512 / DD_CLK Frequency Direct PWM (Analog) T Lamp Current (mA) + BRITE_IN DD_CLK _ 0 T1 T2 DD_CLK T T1 LX1691A T DD_CLK T 2 +3V T = 512 / Lamp Frequency + VDC VDC 2 Lamp Current (mA) BRITE_IN VDC 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 PW Plastic TSSOP 16-PIN RoHS Compliant / Pb-free -40 to +85 2.8V 5.5V LX1691AIPW Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1691AIPW-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