LED driver for phase cut dimmer

The invention relates to an LED driver (20) for an LED lamp (3) or a luminaire. The LED driver (20) comprises input ports (21, 22), a rectifier circuit (23), a power stage (25) and output ports (27, 28), wherein the input ports (21, 22) are configured to connect the LED driver (20) to an AC power supply, preferably to an output of a phase cut dimmer (2), the received AC power has an on time Ton representing a time period of a non-zero voltage for each cycle of the AC power; the rectifier circuit (23) is connected to the input ports (21, 22) and configured to convert the AC power provided by the input ports (21, 22) into DC power; the power stage (25) is connected to the rectifier circuit (23) and configured to convert the DC power provided by the rectifier circuit (23) into DC power havinga power factor suitable for driving one or more LEDs (10); and the output ports (27, 28) are connected to the power stage (25) and configured to output the DC power provided by the power stage (25),and the power stage (25) i