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A DC-DC buck converter operates in continuous conduction mode. It has 48 V input voltage, and it feeds a resistive load of 24 Ω. The switching frequency of the converter is 250 Hz. If switch-on duration is 1 ms, the load power is

1. 6 W
2. 12 W
3. 24 W
4. 48 W

Correct answer: 6 W

Solution

Duty ratio D = t_on x f = 1 ms x 250 Hz = 0.25, so Vo = 0.25 x 48 = 12 V. Load power = Vo^2/R = 144/24 = 6 W. Stored answer 12 W is incorrect.

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