Q13. A buck converter is constructed with a MOSFET which has an on-state resistance of 75m?,...

Q13. A buck converter is constructed with a MOSFET which has an on-state resistance of 75m?, and a diode with a forward voltage drop of 1.3V. The MOSFET exhibits switching rise and fall times of 50ns. The converter operates from an input voltage of 400V and. The converter supplies 1.2kW at an output voltage of 300V and switches at 150kHz. The MOSFET and the diode are mounted onto separate heatsinks. The ambient temperature in which the power converter operates is 45°C.

Other thermal data are:

MOSFET Junction to case thermal resistance, R?jc 0.5°C/W, Case to heatsink thermal resistance, R?chs 1.2°C/W

Diode Junction to case thermal resistance, R?jc 0.8°C/W ,Case to heatsink thermal resistance, R?chs 1.5°C/W

(a) Calculate the power dissipation in the MOSFET.

(b) Calculate the power dissipation in the diode.

(c) Calculate the thermal resistance of each heatsink if the temperature of the devices’ junctions is to be restricted to 110°C.

Expert Solution

Manojponduru answered 2 years ago

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