The invention relates to a synchronous flyback converter (100) having terminals for supplying an LED load. The synchronous flyback converter (100) comprises a sensing winding (Lw) coupled to a primary winding (Lp) of a transformer T of the flyback converter (100), a control unit (106) controlling a primary side switch (S1) in series to the primary winding (Lp) of the flyback converter (100) using a feedback signal for a closed loop control of a secondary side voltage of the flyback converter (100) by controlling the frequency and/or duty cycle of the switching of the primary side switch (S1), wherein the feedback signal is derived from a sensing voltage across the sensing winding (Lw) sampled once during a switch-on time of a secondary side switch (S2) of the flyback converter (100).