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 Adjustable boost timing Fixed boost current ratio of 1.5 Gradually boost to burn transition timingUBA20261/2 NXP Semiconductors 600 V and 350 V power IC for step dimmable CFLs 2.4 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 2.5 Protection OverTemperature Protection (OTP) Capacitive Mode Protection (CMP) OverPower Protection (OPP) OverCurrent Protection (OCP) in both boost and burn states Power-down function 2.6 Other features Current controlled operation in both boost and burn state External power-down option 3. 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 4. Ordering information Table 1. Ordering information Type number Package Name Description Version UBA20261T/N1 SO20 plastic small outline package 20 leads body width 7.5 mm SOT163-1 UBA20262T/N1 SO20 plastic small outline package 20 leads body width 7.5 mm SOT163-1 UBA20261 UBA20262 All information provided in this document is subject to legal disclaimers. NXP B.V. 2011. All rights reserved. Product data sheet Rev. 2 10 October 2011 2 of 32