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Power/Alternative Energy??

LCD backlight inverter drive IC (FAN7311)

Posted: 25 Jan 2010 ?? ?Print Version ?Bookmark and Share

Keywords:LCD backlight inverter? CCFL backlight? FAN7311 circuit blocks?

Design goals for a CCFL inverter for use in a notebook PC or other portable applications include small size, high efficiency and low cost. The FAN7311 provides the necessary circuit blocks to implement an efficient CCFL backlight power supply in 20-SSOP and 20-SOIC packages.

The FAN7311 typically consumes less than 4mA of operating current, improving overall system efficiency. External parts count is minimized and system cost is reduced by the integration of features including feedback-controlled PWM driver stage, soft start, open lamp regulation and under voltage lockout protection (UVLO). The FAN7311 includes an internal shunt regulator that allows operation with an input voltage from 5V to 25.5V. It supports analog and burst dimming modes of operation. The FAN7311 provides open lamp regulation and protection. Open lamp regulation protects the transformer from overvoltage during startup or when an open lamp occurs. The transformer voltage is regulated by reducing duty cycle when an overvoltage is detected. Open lamp protection can be used to shut down an IC when an open lamp condition continues longer than a specified time.

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