General description
The UBA20270 is a high-voltage power IC intended to control higher powered self ballasted Compact Fluorescent Lamp (CFL) lighting applications. The UBA20270 is a controller circuit with advanced features for dimming and has a lamp current controlled boost feature for boosting cold (amalgam) CFLs.

Features and benefits
2.1 Half-bridge features
■ Integrated high-voltage level-shift function with integrated bootstrap diode

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

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

2.4 Dim features
■ Continuously variable dimming function for standard phase cut dimmers
■ Natural dimming curve by logarithmic correction
■ Adjustable Minimum Dimming Level (MDL)
■ Controlled lamp ON/OFF

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

2.6 Other features
■ Current controlled operating in boost and burn state
■ External power-down function
■ Lamp flicker suppression

Applications
■ Dimmable compact fluorescent lamps for power levels above 20 W and for universal mains voltages.