Download the datasheets of an Infineon MOSFET with part number SPA20N60C3 and heatsink catalog from Aavid Thermalloy. Complete the following:

a) Draw the switch power loss waveform corresponding to the rise time and the fall time information given in the datasheet. Assume that your switch operating conditions correspond to the test operating conditions given in the datasheet and the complementary diode is an idea diode. (Hint: Please refer to Page 3 of the datasheet). Determine the package of the device SPA20N60C3 from the datasheet

b) Assume that the total power dissipation in the device is 2W. Draw the thermal equivalent circuit of the device. Pick the values of the thermal resistances from the device’s datasheet and label them on your circuit.

c) Assuming an ambient temperature of 25 degree Celsius, determine the junction temperature of the device. Would the device be able to survive the power loss without a heatsink? Why? Or, why not?

d) Select a heatsink for the device which can limit the junction temperature to 100 degree Celsius under the worst case ambient temperature of 75 degree Celsius (determined by the application). Assume natural convection. Please take a screenshot of the part number along with the details and include it in your homework solution (please add source URL to the image file). What would be the junction temperature of the device if air velocity of 600 feet per minute is used in the application?

Note: Please refer to “How to Use This Catalog” in the Aavid Thermalloy heatsink datasheet for more information on reading the heatsink datasheet, if needed.

Answer rating: 100% (QA)

A The power loss waveform of the Infineon SPA20N60C3 MOSFET can be drawn based on the rise time and fall time information given in the datasheet The rise time tr and fall time tf of the device are giv... View the full answer