LED emitting device and driving method thereof

A method for driving an LED emitting device including an LED channel, comprising:

• receiving an input voltage and increasing an output voltage to a predetermined rated voltage, the output voltage being generated according to a switching operation of a power switch;
• stopping a generation operation of the output voltage by stopping the switching operation of the power switch during a predetermined short circuit sense period starting from a time when the output voltage reaches the rated voltage;
• and
• dimming the LED channel or determining the LED channel to be in the short circuit state according to a result of comparing the output voltage and a predetermined threshold voltage during the short circuit sense period.

A device comprising:

• a power supply for receiving an input voltage and supplying an output voltage needed for an operation of a load according to a switching operation of a power switch;
• a power controller for controlling the output voltage;
• a load switch connected between the load and the power supply;
• and
• a short circuit sense protector for determining the load to be short circuited when the output voltage is reduced to a predetermined threshold voltage for a predetermined short circuit sense period from a time when the output voltage reaches a regulated voltage before the load is operated,
• wherein during the short circuit sense period, the power controller stops the power supply from supplying the output voltage and the short circuit sense protector turns on the load switch.

A method for driving a load, comprising:

• receiving an input voltage and increasing an output voltage to a predetermined rated voltage;
• stopping a generation operation of the output voltage during a predetermined short circuit sense period starting from a time when the output voltage reaches the rated voltage;
• and
• determining the load to be in the short circuit state according to a result of comparing the output voltage and a predetermined threshold voltage during the short circuit sense period.