DESCRIPTION

The LX1691B is an enhanced Direct Drive CCFL (Cold Cathode Fluorescent Lamp) Controller. Its architecture is based on the LX1691. The LX1691B is optimized for wide input voltage applications. It is similar to the LX1691 except it has a guaranteed minimum lamp strike interval of one second1 to meet notebook and monitor panel manufacturer’s specifications. The “B” version also adds feed forward input voltage sensing to enhance transient response when used in inverters that derive lamp power from unregulated input supplies and batteries.

KEY FEATURES

◾ Wide Input Voltage Capable

◾ 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

BENEFITS

◾ Low Component Count / Module Cost / And Size

◾ High “Nits/Watt” Efficiency

◾ Can Operate 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