A circuit for powering at least one light source adapted to operate in the presence of a phase-cut dimmer, comprising: a rectifier circuit having AC input terminals to receive AC input power and first and second DC output terminals (101a, 101b) to provide rectified DC power; an EMI filter circuit having first and second filter input terminals coupled with the DC output terminals (101a, 101b) of the rectifier circuit and first and second filter output terminals (102a, 102b), the EMI filter circuit comprising: a filter capacitance with a first terminal coupled with the first DC output terminal of the rectifier circuit, and characterized by a field effect transistor configured to operate as a variable impedance which clamps the maximum current, the field effect transistor comprising: a first source/drain terminal coupled with a second terminal of the filter capacitance, a second source/drain terminal coupled with the second DC output terminal of the rectifier circuit and with the second filter output terminal of the EMI filter circuit a gate terminal coupled with the second DC output terminal of the rectifier circuit; an inductance with a first terminal coupled with the first DC output terminal of the rectifier circuit, and a second terminal coupled with the first filter output terminal; and a power converter circuit, comprising at least one DC to DC converter circuit with DC input terminals coupled with the filter output terminals (102a, 102), the power converter circuit operative to directly or indirectly provide power to at least one light source. a rectifier circuit having AC input terminals to receive AC input power and first and second DC output terminals (101a, 101b) to provide rectified DC power; an EMI filter circuit having first and second filter input terminals coupled with the DC output terminals (101a, 101b) of the rectifier circuit and first and second filter output terminals (102a, 102b), the EMI filter circuit comprising: a filter capacitance with a first terminal coupled with the first DC output terminal of the rectifier circuit, and characterized by a field effect transistor configured to operate as a variable impedance which clamps the maximum current, the field effect transistor comprising: a first source/drain terminal coupled with a second terminal of the filter capacitance, a second source/drain terminal coupled with the second DC output terminal of the rectifier circuit and with the second filter output terminal of the EMI filter circuit a gate terminal coupled with the second DC output terminal of the rectifier circuit; an inductance with a first terminal coupled with the first DC output terminal of the rectifier circuit, and a second terminal coupled with the first filter output terminal; and a filter capacitance with a first terminal coupled with the first DC output terminal of the rectifier circuit, and characterized by a field effect transistor configured to operate as a variable impedance which clamps the maximum current, the field effect transistor comprising: a first source/drain terminal coupled with a second terminal of the filter capacitance, a second source/drain terminal coupled with the second DC output terminal of the rectifier circuit and with the second filter output terminal of the EMI filter circuit a gate terminal coupled with the second DC output terminal of the rectifier circuit; a first source/drain terminal coupled with a second terminal of the filter capacitance, a second source/drain terminal coupled with the second DC output terminal of the rectifier circuit and with the second filter output terminal of the EMI filter circuit a gate terminal coupled with the second DC output terminal of the rectifier circuit; an inductance with a first terminal coupled with the first DC output terminal of the rectifier circuit, and a second terminal coupled with the first filter output terminal; and a power converter circuit, comprising at least one DC to DC converter circuit with DC input terminals coupled with the filter output terminals (102a, 102), the power converter circuit operative to directly or indirectly provide power to at least one light source.