The UBA2211 and UBA2213 are ICs for driving CFL lamps for the 230 V mains market. A resonant type electronic ballast consists of: an input circuit making a DC voltage marked as VIN from the mains; a half bridge; a resonant tank consisting of the lamp, Clamp and Llamp; and one or two DC blocking capacitors marked as COUT1 and COUT2. The input circuit also contains an EMI filter inductor LFILT. The resistor Rfuse is a combination of a resistor and a fuse. This resistance is needed in order to limit current spikes towards the electrolytic capacitor CBUF if the lamp is switched on at the peak of the mains.