Question

You are required to design a 10V to 5V non-isolated step-down converter. The converter specifications are as follows:

• Minimum input voltage: 6V

• Maximum input voltage: 10V

• Output voltage: 5V

• Switching frequency: 20 kHz

• Output voltage ripple: 20mV

• Maximum output load current: 1A

• Minimum output load current: 0.1A

The converter must operate in the continuous conduction mode under all output current conditions and input voltage conditions. During this design process, provide good engineering reasons for your choice of values and state any assumptions you have made

During the design process you must:

1. Draw the circuit diagram of your converter of choice and include a sentence explaining why you chose to use this converter topology.

2. Calculate practical inductance and capacitance values based on the given specifications and demonstrate that continuous conduction mode is guaranteed.

3. Calculate the peak current and voltage values for the switch, diode, inductor and output capacitor. Please ensure that the circuit is designed such that these peaks values are reasonable.

4. Decide on what type of switch (MOSFET, IGBT, thyristor, GTO, Power BJT) and what type of diode (rectifier, Schottky, fast-recovery) you would choose for your circuit and why.

Answer 1

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