LX1691A Datasheet | Microsemi

DESCRIPTION KEY FEATURES - 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 On Chip timing capacitor - Enhanced Digital Dimming Resolution - Wide Input Voltage Capable BENEFITS - Low ponent 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 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. 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...