How to Achieve a 300:1 Dimming Ratio with the DS3881/DS3882 CCFL ...   [Open results in new window]
... CCFLs can be dimmed using either amplitude modulation or ... analog dimming technique
from achieving a dimming ratio of ... than about 3:1. Digital burst PWM dimming ...
japan.maxim-ic.com/appnotes.cfm/an_pk/3997 - 26k

CCFL ...   [Open results in new window]
To reduce the instantaneous current demand on the DC inverter power supply, the
DS3984 and DS3988 stagger the start of the burst dimming cycle for each of the channels ...
japan.maxim-ic.com/appnotes.cfm/an_pk/3614 - 20k