Switching apparatus and control method thereof

A switching apparatus including an internal circuit using an inductive element, comprising:

• a switch that regulates a current of the inductive element;
• an SR latch that turns on the switch in correspondence to a set signal periodically provided and turns off the switch in correspondence to a reset signal;
• and
• a reset signal generator that receives a monitoring voltage corresponding to the current of the inductive element and a reference voltage corresponding to a target average current of the inductive element, obtains a first voltage and a second voltage sampled using at least one of the monitoring voltage and the reference voltage, and generates the reset signal when levels of the first and second voltages are equal to each other,
• wherein the reset signal generator samples a difference between the monitoring voltage and the reference voltage at a turn-on time point of the switch, samples a sum of the difference and the reference voltage as the first voltage at a time point which a predetermined time has passed based on the turn-on time point of the switch, samples the monitoring voltage as the second voltage from the time point at which the predetermined time has passed, and generates the reset signal to turn off the switch when the second voltage reaches the level of the first voltage.

A control method of a switching apparatus including an internal circuit using an inductive element and a switch for regulating a current of the inductive element, comprising the steps of:

• turning on the switch in correspondence to a set signal periodically provided;
• receiving a monitoring voltage corresponding to the current flowing through the inductive element when the switch is turned on, and receiving a reference voltage corresponding to a target average current of the inductive element;
• sampling a difference between the monitoring voltage and the reference voltage at a turn-on time point of the switch;
• sampling a sum of the difference and the reference voltage as a first voltage at a time point which a predetermined time has passed based on the turn-on time point of the switch;
• sampling the monitoring voltage as a second voltage from the time point at which the predetermined time has passed
• turning off the switch, when the second voltage reaches the level of the first voltage.