In various embodiments, a controller (100) for controlling the operation of a switched-mode power supply is provided, wherein the controller (100) comprises: a first signal source (102), which is adapted to a first to provide for a sit-signal and a clear - signal, wherein the first for possibly a first operating mode of the switched-mode power supply; a second signal source (104), which is adapted to a second to provide for a sit-signal and a clear - signal, wherein the second for possibly a second operating mode of the switched-mode power supply; a selection circuit (106) associated with the first signal source (102) and with the second signal source (104) is connected, wherein the selection circuit (106) is adapted for either the first or the second to select for; a switching signal generating circuit (108), with the selection circuit (106) is connected and which is adapted to the switch mode power supply, a switching signal on the basis of the of the selection circuit (106) to provide signal set received.
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