A driver device (10) for driving a load (22), in particular for driving an LED unit comprising one or more LEDs is presented. The driver device comprises input terminals (12, 14) for connecting the driver device to an electrical power supply (16) for receiving a variable input voltage (V10) from the electrical power supply, a converter unit (25) for converting the input voltage (V10) to an output voltage (V12) including a resonant converter (40) and a switch unit (26), wherein the switch unit is adapted to provide a chopped voltage of the input voltage as a drive voltage (V16) to the resonant converter, and a control unit (34) connected to the switch unit for controlling a pulse frequency (fP) of the chopped voltage, wherein the control unit is adapted to control an input current (I10) drawn from the electrical power supply by controlling the pulse frequency of the chopped voltage on the basis of a measured value of the variable input voltage.