Buck Converter Quiz

What happens to the inductor current when the input voltage increases in a buck converter operating in CCM?

• The inductor current decreases.

• The inductor current remains constant.

• The inductor current up-slope becomes steeper.

• The inductor current down-slope becomes steeper.

Which component's value is adjusted in a buck converter to maintain output voltage as the input voltage changes?

• Inductor (L)

• Capacitor (C)

• Duty cycle (D sw)

• Switching frequency (f sw)

What happens to the inductor current in a buck converter operating in DCM?

• It remains constant.

• It becomes discontinuous and drops to zero.

• It increases continuously.

• It oscillates around a fixed value.

In DCM, what is the key indicator that the inductor has discharged all its stored energy?

• The output voltage drops significantly.

• The inductor current reaches zero and stays there for a part of the cycle.

• The switching frequency increases.

• The inductor current increases rapidly.

What is the effect of increasing the input voltage (V in) on the duty cycle (D sw) in a buck converter?

• The duty cycle increases.

• The duty cycle remains constant.

• The duty cycle decreases.

• The duty cycle becomes zero.

Which of the following conditions could cause a buck converter to transition from CCM to DCM?

• High output voltage

• Low switching frequency

• High input voltage

• Low inductance value

Why does the converter operate in DCM when the input voltage becomes significantly high?

• The inductor cannot maintain continuous current flow due to a very short duty cycle.

• The capacitor charges faster than the inductor.

• The switching frequency increases to compensate.

• The output voltage increases beyond the desired value.

What happens to the converter's efficiency when operating in DCM?

• It increases.

• It remains the same as in CCM.

• It decreases due to increased switching losses.

• It fluctuates based on the load.

Which parameter primarily influences the boundary between CCM and DCM in a buck converter?

• Inductance (L)

• Input voltage (V in)

• Output voltage (V out)

• All of the above

In a regulated buck converter, what is kept constant to manage the output voltage when the input voltage varies?

• Output voltage

• Inductor value

• Capacitor value

• Switching duty cycle