A power converter configured to convert electrical energy at an input voltage into electrical energy at an output voltage, the power converter comprising - a power switch configured to be switched between an on-state and an off-state; - a voltage divider (201, 202) coupled to the input voltage; wherein the voltage divider (201, 202) comprises a high side resistor; - a transformer comprising a primary winding and an auxiliary winding; wherein the primary winding is arranged in series to the power switch; - a supply voltage capacitor coupled to a supply voltage pin of a controller; and - the controller configured to generate a control signal for putting the power switch into the on-state and into the off-state, respectively; wherein the control signal is generated based on a first and a second measurement signal from the power converter external to the controller; wherein the controller comprises a sensing pin configured to sense the first measurement signal, when the power switch is in on-state, and configured to sense the second measurement signal, when the power switch is in off-state; wherein the high side resistor is coupled to the sensing pin for providing the first measurement signal; wherein the auxiliary winding is coupled to the sensing pin via a diode for providing the second measurement signal; wherein the diode is reverse biased, when the power switch is in on-state, thereby decoupling the auxiliary winding from the sensing pin, when the power switch is in on-state; and wherein the controller is configured to couple the sensing pin to the supply voltage pin upon startup of the power converter to charge the supply voltage capacitor via the high side resistor (201, 161) of the voltage divider (202, 201). - a power switch configured to be switched between an on-state and an off-state; - a voltage divider (201, 202) coupled to the input voltage; wherein the voltage divider (201, 202) comprises a high side resistor; - a transformer comprising a primary winding and an auxiliary winding; wherein the primary winding is arranged in series to the power switch; - a supply voltage capacitor coupled to a supply voltage pin of a controller; and - the controller configured to generate a control signal for putting the power switch into the on-state and into the off-state, respectively; wherein the control signal is generated based on a first and a second measurement signal from the power converter external to the controller; wherein the controller comprises a sensing pin configured to sense the first measurement signal, when the power switch is in on-state, and configured to sense the second measurement signal, when the power switch is in off-state; wherein the high side resistor is coupled to the sensing pin for providing the first measurement signal; wherein the auxiliary winding is coupled to the sensing pin via a diode for providing the second measurement signal; wherein the diode is reverse biased, when the power switch is in on-state, thereby decoupling the auxiliary winding from the sensing pin, when the power switch is in on-state; and wherein the controller is configured to couple the sensing pin to the supply voltage pin upon startup of the power converter to charge the supply voltage capacitor via the high side resistor (201, 161) of the voltage divider (202, 201).