UBA20262

UBA20261/2 600 V and 350 V power IC for step dimmable CFLs Rev. 2 — 10 October 2011 Product data sheet 1. 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. The controller contains a CFL half-bridge drive function, a high-voltage level-shift circuit with integrated bootstrap diode, an oscillator function, a current control function for preheat and burn, a timer function and protection circuits. The UBA20261/2 are supplied using the dV/dt current charge supply circuit from the half-bridge circuit. Remark: The mains voltages given in this data sheet are AC voltages. 2. Features and benefits 2.1 Half-bridge features  UBA20261: two internal 350 V, 1 , maximum 5 A NMOST half-bridge power MOSFETs  UBA20262: two internal 600 V, 3 , maximum 2.7 A NMOST half-bridge power MOSFETs  Integrated high-voltage level-shifter function with integrated bootstrap diode 2.2 Preheat and ignition features  Coil saturation protection during ignition  Adjustable saturation protection level  Adjustable preheat time  Adjustable preheat current  Ignition lamp current detection 2.3 Lamp boost features  Adjus...