- Q1 A Requirement Has Arisen For A D C To D C Power Converter With The Following Specifications Min 4 0v Max 5 5v Inpu 1 (99.45 KiB) Viewed 39 times
Q1 A requirement has arisen for a d.c. to d.c. power converter with the following specifications: min 4.0V max 5.5V Input voltage: Output voltage: nominal (regulated) 3.3V Nominal load current: 5A Inductor current ripple: 0.1 A max Switching frequency: 20kHz Output voltage ripple: 20mV (a) Define a suitable power circuit topology to meet the above specification? Sketch a circuit diagram of the chosen power circuit topology. (5 marks) (b) Define the minimum and maximum duty cycles assuming that the control circuit keeps the output voltage constant at the nominal value. (2 marks) (c) Given the above specification, what would be the maximum input current (assuming the load current is constant at the nominal value) (2 marks) (d) Design a suitable converter power circuit using a MOSFET switch, showing all calculation of inductor and capacitor values and drawing a circuit diagram of the final design including component values. Indicate the peak inverse voltage and forward current rating of any diode required, and the maximum drain-source voltage of the MOSFET. (11 marks)