Control unit for controlling at least one actively clocked converter for electrically supplying at least one illuminant , in particular a light-emitting diode, wherein - the actively clocked converter comprises at least two switches (S1, S2) and an energy storage unit (L1), in particular an inductor; - the control unit is configured to control the charging and discharging of the energy storage unit (L1) by switching the at least two switches (S1, S2) on and off, and - the control unit is configured to receive as a feedback variable (RG) the current flowing through the energy storage unit (L1); - the control unit is configured, during at least one switching cycle (SZ n ), - to control a switching of at least one switch of the at least two switches (S1, S2) as a function of a switch-on time span (T on_S1 , To n_S2 ), - to determine, on the basis of the feedback variable, the time span after which the current flowing through the energy storage unit (L1) reaches a threshold value (SW1, SW2), and - to adapt the switch-on time span (T on_S1 , T on_S2 ) for the following switching cycle (SZ n+1 ) as a function of the determined time span (T SW1 , T SW2 ), characterized in that the control unit is configured - to determine whether a sum of the determined time span (T SW1 , T SW2 ) and a safety time span (T S ) falls within a safety range (SB) of the switch-on time span (T on_S1 , T on_S2 ) and to adapt the switch-on time span (T on_S1 , T on_S2 ) for the following switching cycle (SZ n+1 ) as a function of the determination with respect to the safety range (SB), wherein a switching cycle is a period during which the energy storage unit (L1) of the converter is charged once and discharged again. - the actively clocked converter comprises at least two switches (S1, S2) and an energy storage unit (L1), in particular an inductor; - the control unit is configured to control the charging and discharging of the energy storage unit (L1) by switching the at least two switches (S1, S2) on and off, and - the control unit is configured to receive as a feedback variable (RG) the current flowing through the energy storage unit (L1); - the control unit is configured, during at least one switching cycle (SZ n ), - to control a switching of at least one switch of the at least two switches (S1, S2) as a function of a switch-on time span (T on_S1 , To n_S2 ), - to determine, on the basis of the feedback variable, the time span after which the current flowing through the energy storage unit (L1) reaches a threshold value (SW1, SW2), and - to adapt the switch-on time span (T on_S1 , T on_S2 ) for the following switching cycle (SZ n+1 ) as a function of the determined time span (T SW1 , T SW2 ), characterized in that the control unit is configured - to determine whether a sum of the determined time span (T SW1 , T SW2 ) and a safety time span (T S ) falls within a safety range (SB) of the switch-on time span (T on_S1 , T on_S2 ) and to adapt the switch-on time span (T on_S1 , T on_S2 ) for the following switching cycle (SZ n+1 ) as a function of the determination with respect to the safety range (SB), wherein a switching cycle is a period during which the energy storage unit (L1) of the converter is charged once and discharged again. <EOS>