UC3872N.

The UC3872N is a resonant Lamp Ballast Controller optimized for driving cold cathode fluorescent, neon and other gas discharge lamps. The resonant power stage develops a sinusoidal lamp drive voltage and minimizes switching loss and EMI generation. Lamp intensity adjustment is accomplished with a buck regulator, which is synchronized to the external power stage's resonant frequency. Suitable for battery-powered applications, the UC3872 draws only 1µA when disabled. Soft-start and open lamp detect circuitry have been incorporated to minimize component stresses. Open lamp detection is enabled at the completion of a soft start cycle. The chip is optimized for smooth duty cycle control to 100%. Other features include a precision 1.2% reference, under-voltage lockout, accurate minimum and maximum frequency control.