General description

The UBA2028 is a high voltage power IC that drives and controls electronically ballasted Compact Fluorescent Lamps (CFLs). The IC includes a Metal-Oxide-Semiconductor Transistor (MOST) half-bridge power circuit, a dimming function, a high voltage level shift circuit, an oscillator function, a lamp voltage monitor, a current control function, a timer function and various protections.

Features and benefits

■ Two internal 600 V, 3 Ω max MOST half-bridge power circuits

■ For steady state currents up to 280 mA

■ For ignition currents up to 1.5 A

■ Adjustable preheat time

■ Adjustable preheat current

■ Current controlled operating

■ Single ignition attempt

■ Adaptive non-overlap time control

■ Integrated high voltage level shift function

■ Power-down function

■ Protection against lamp failures or lamp removal

■ Capacitive mode protection

Applications

■ 5 W to 25 W dimmable CFLs, provided that the maximum junction temperature is not exceeded.