Single FET Controls LED Arrray:
04/12/01 EDN-Design Ideas / PDF contains
multiple circuits - scroll to find the one of
interest / White-LED backlights are gaining
acceptance because they offer higher reliability
and simpler drive circuitry than backlights
based on CCFL (cold-cathode-fluorescent-lamp)
and EL (electroluminescent) technology. This
circuit shows a switch-mode boost design that
regulates current instead of voltage and
switching off individual LEDs or groups of LEDs
is not a problem