Buck volatge converting apparatus

A buck voltage converting apparatus, comprising:

• a first transistor, having a first terminal, a second terminal, and a control terminal, wherein the first terminal of the first transistor receives an input voltage, and the control terminal of the first transistor receives a first control signal;
• a second transistor, having a first terminal, a second terminal, and a control terminal, wherein the second terminal of the first transistor is coupled to the first terminal of the second transistor, the second terminal of the second transistor is coupled to a reference ground voltage, and the control terminal of the second transistor receives a second control signal;
• an inductor, wherein a first terminal of the inductor is coupled to the second terminal of the first transistor and a second terminal of the inductor is coupled to an output terminal of the buck voltage converting apparatus to generate an output voltage;
• a controller, receiving the output voltage, detecting a value of the output voltage to generate a detection voltage;
• and
• a switch, connected in series between the second terminal of the first transistor and the control terminal of the second transistor, wherein the switch is turned on or off based on the detection voltage.