LED driver with standby mode, and method for utlizing standby mode in a LED driver

摘要

A driver device provides output current to at least one semiconductor light-emitting device. It comprises a first stage switched-mode power supply (103) configured to produce a bus voltage (Vbus), and a second stage switched-mode power supply (104) configured to utilize said bus voltage to produce an output current to be led to said at least one semiconductor light-emitting device. A voltage feedback arrangement is configured to convey a feedback signal representing said bus voltage to a control circuit (105) of said first stage switched-mode power supply (103). A controller is capable of setting the driver device into a standby mode in which said output current is essentially zero. Said controller is configured to change the way in which said feedback signal represents said bus voltage as a part of setting the driver device into said standby mode, for lowering the bus voltage.