LED retrofit lamp having active over-current protection circuit

An LED retrofit lamp for being connected to a high frequency electronic ballast, the high frequency electronic ballast being adapted for providing a voltage and a current to the LED retrofit lamp, the LED retrofit lamp comprising:

• an LED unit,
• an adapting unit configured to adapt the voltage and the current provided to the LED retrofit lamp at the output of the high frequency electronic ballast to a voltage and a current for operating the LED unit,
• a detecting unit configured to detect an electrical value that depends on the current provided to the LED retrofit lamp at the output of the high frequency electronic ballast, and
• a ballast protection unit configured to perform, in dependence of the detected electrical value, a switching operation to electrically disconnect the adapting unit from the high frequency electronic ballast, such that the high frequency electronic ballast is protected from an overcurrent situation,
• wherein the adapting unit comprises an LC circuit comprising an inductor and a capacitor,
• wherein the inductor of the LC circuit is inductively coupled to an auxiliary winding and the detected electrical value is a voltage value derived from a voltage across the auxiliary winding.