General description
The UBA20261/2 are high-voltage power integrated circuits designed to drive and control high powered self-ballasted Compact Fluorescent Lamp (CFL) lighting applications operating at mains supply voltages of 120 V or 230 V. The IC includes a half-bridge power circuit consisting of two NMOST power MOSFETs, an advanced feature for step dimming and a lamp current controlled boost feature for boosting cold (amalgam) CFLs.

Features and benefits
Half-bridge features
■ UBA20261: two internal 350 V, 1 Ω, maximum 5 A NMOST half-bridge power MOSFETs
■ UBA20262: two internal 600 V, 3 Ω, maximum 2.7 A NMOST half-bridge power MOSFETs
■ Integrated high-voltage level-shifter function with integrated bootstrap diode

Preheat and ignition features
■ Coil saturation protection during ignition
■ Adjustable saturation protection level
■ Adjustable preheat time
■ Adjustable preheat current
■ Ignition lamp current detection

Lamp boost features
■ Adjustable boost timing
■ Fixed boost current ratio of 1.5
■ Gradually boost to burn transition timing

Dim features
■ 4-level step dimming adjustment using a standard on/off mains switch
■ Adjustable memory retention time for step dimming
■ Adjustable minimum dimming level

Protection
■ OverTemperature Protection (OTP)
■ Capacitive Mode Protection (CMP)
■ OverPower Protection (OPP)
■ OverCurrent Protection (OCP) in both boost and burn states
■ Power-down function

Other features
■ Current controlled operation in both boost and burn state
■ External power-down option

Applications
■ UBA20261: Step-dimmable compact fluorescent lamps at power levels between 5 W and 20 W operating at 120 V mains voltage
■ UBA20262: Step-dimmable compact fluorescent lamps at power levels between 5 W and 20 W operating at 230 V mains voltage