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What is the formula for output voltage for Buck converter?

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What is the formula for output voltage for Buck converter?

(a) 8D×Vin

(b) 5D×Vin

(c) 2D×Vin

(d) D×Vin

The question was asked in an interview for internship.

This interesting question is from Solid-State Switching Circuits topic in division Introduction to Solid-State Switching Circuits of Electric Drives

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The correct option is (d) D×Vin

Easiest explanation: The output voltage of the buck converter is Vo = D×Vin. The value of the duty cycle is less than one which makes the Vo < Vin. The buck converter is used to step down voltage. Vin is a fixed voltage and Vo is a variable voltage.

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