A buck converter has 120-V input voltage, R L = 12 , switching frequency of 1 kHz,

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A buck converter has 120-V input voltage, RL = 12 Ω, switching frequency of 1 kHz, and on-time of 0.5 ms. If the average source current is 2 A, we determine the following:

For 1-kHz switching frequency, T = 1/1000 s = 1 ms, duty ratio = 0.5/1 = 0.5, Ton = 0.5 ms, and Toff = 1 – 0.5 = 0.5 ms

average output voltage = 0.5 x 120 = 60 V average output current = 2/0.5 = 4 A average output power = Vout

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