These levels result in brightness of 4.9 and 3.1 fL, respectively. CCFLs defy direct drive EL lamps operate with drive voltages that are within the breakdown voltages you can obtain with low-cost semiconductor processing. This statement does not hold true for CCFLs, which typically operate from 550V rms. Available CCFL drivers use a Royer-type oscillator. This resonant circuit oscillates at a frequency dependent on the capacitor across the step-up transformer's primary, the primary magnetizing inductance, and the reflected secondary impedance.
Most CCFL drivers use a similar topology.
The LT1786F operates from 4.5 to 30V supplies. Like EL lamps, CCFLs prefer symmetrical ac waveforms, as any signal with a persistent dc component can cause long-term degradation of the lamp's brightness. Maxim also offers another way to set the brightness, by providing a fixed lamp current and chopping the CCFL on and off faster than your eye can perceive. To light a CCFL, you must apply a minimum strike voltage, which is typically 1.8 times the CCFL rms operating voltage. Micro Linear's ML4877 and ML4878 CCFL drivers also use a Royer-type inverter circuit to drive the lamp.