UBA20270

UBA20270 600 V Driver IC for dimmable compact fluorescent lamps Rev. 2 — 8 September 2011 Product data sheet 1. 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. The controller contains a half-bridge drive function for CFL, a high-voltage level-shift circuit with integrated bootstrap diode. In addition, the controller contains an oscillator function, a current control function both for preheat and burn, a timer function and protection circuits. The UBA20270 is supplied via a dV/dt current charge supply circuit from the half-bridge circuit. Remark: Mains voltages noted are AC. 2. 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 NXP Semicondu...