Controller and conveter including for the same

An object of the present invention is to provide a power supply apparatus for controlling brightness comprises capable of preventing a malfunction occurs and the control device him. The invention and the control device comprises a control block for modulating the feedback signal in response to the size of the gate signal gate driver, and the sense signal, but passes produce a feedback signal receiving, the sense signal for outputting is controlled by a feedback signal him to provide a power supply device including.