The UBA2212 IC has the same features as the UBA2213 but is intended for the 120 V mains market. The MOSFETs inside the UBA2212 can take a lower voltage (250 VDC) but in return have a lower ON resistance. To avoid capacitive mode, in an 120 V mains system the C5 resonance capacitor tends to be much larger (6-10 nF) than in a 230 V system (2-4 nF). This larger capacitor value results in a higher MOSFET current, hence the lower Ron. Due to this higher reactive current, a separate sense of the CFL discharge current is needed. The lamp discharge current is measured via RCSI in the schematic on this slide. If preheat is required this can be done via inductive mode heating (secondary windings on the transformer). The UBA2212 has a minimum frequency set by Rosc and Cosc just like the UBA2211 and UBA2213, but typically will not run on this but instead on the RCSI resistor feedback voltage. The UBA2212 has a separate boost timing capacitor, marked CB.