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Robert Tang to fill out when the time comes

Background Knowledge

Buck Converter

DC-DC Step-down voltage regulator.

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Components:

• Source (Vin)

• Switch

  • Usually a MOSFET, because manually switching on/off the switch is tooo slow

• Diode

  • In synchronous buck converter, a second MOSFET is added

• Inductor

  • Stores and release energy (as current)

• Capacitor

  • Smooth the voltage output

Calculating the conversion factor in CCM

*In this application we are only interested in Continuous Conduction Mode (CCM), where essentially i_L is larger than 0 for all time during CCM.

Some assumptions to be made before the calculation:

1. Assume CCM

2. Average steady state (Over period, the average values will be constant)

3. Vin and Vout constant with respect to time

4. Diodes and FETs are ideal

The calculation: