LX1699CLQ数据手册Microchip中文资料规格书

描述 Description

The LX1699 is a high performance, low cost CCFL (Cold Cathode Fluorescent Lamp) controller optimized for wide input voltage range display backlighting applications. The LX1699 brightness control architecture supports Intel’s DPST (Display Power Saving Technology) that adjusts the brightness as a function of video content. 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. The LX1699 has improved lamp current accuracy, fully programmable lamp frequency and burst dimming frequency oscillators, and Microsemi’s patented full-proof lamp strike circuitry. Programmable open lamp strike timeout and open lamp, short lamp, and over voltage fault detection are fully implemented. 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.

特性 Features

·Plastic Package
·Ruggedized Design