Power supply, electronic device including the same, and method of driving the same

A method of driving a power supply, the method comprising:

• turning on, during a discharge period, a first discharge switching element electrically connected to a feedback terminal;
• applying, during a sensing period after the discharge period, a reference current to an input node electrically connected to the feedback terminal;
• comparing a first feedback voltage of the input node with a reference voltage;
• and
• determining whether an external resistor is connected to the feedback terminal according to a result of comparing the first feedback voltage of the input node with the reference voltage.

An electronic device, comprising:

• a power supply converting an input voltage to generate a plurality of output voltages;
• a data driver receiving one of the plurality of output voltages and generating a data voltage;
• a scan driver receiving one of the plurality of output voltages and generating a scan signal;
• and
• a display panel in which a plurality of pixels, to which the data voltage and the scan signal are applied, are arranged,
• wherein the power supply includes:
• an output terminal to output an output voltage of the plurality of output voltages;
• a voltage conversion circuit configured to generate the output voltage corresponding to a duty ratio of a first switching control signal;
• a feedback terminal electrically connected to the output terminal and electrically connected to an input node to which a first feedback voltage is applied;
• a current supply configured to provide a reference current to the input node in response to a current supply signal of a turn-on level which is input during a sensing period;
• a comparison unit configured to compare a voltage applied to the input node with a reference voltage, to output a feedback control signal of a first level during a discharge period preceding the sensing period, and to output the feedback control signal of the first level or a second level during the sensing period;
• an internal voltage divider circuit configured to electrically connect the input node and a ground power source in response to the feedback control signal of the first level, and to divide the first feedback voltage into a second feedback voltage in response to the feedback control signal of the first level;
• and
• a voltage controller configured to adjust the duty ratio of the first switching control signal in response to the second feedback voltage.