A fluorescent lamp ballast control circuit includes a ballast controller IC for
driving a fluorescent lamp in a half-bridged topology and a control circuit. The
control circuit receives an input signal and provides an output signal to the ballast
controller IC. The control circuit further receives a feedback signal indicative
of the fluorescent lamp current. The control circuit output signal is based on
the input signal and the feedback signal. The fluorescent lamp ballast control
circuit is used in combination with a fluorescent lamp ballast.