Question

For a heatsink connected to a MOSFET, list the path of thermal resistances that the heat dissipated by the MOSFET travels through, starting from the junction to ambient air.

Answer 1

The path of thermal resistances that the heat dissipated by the MOSFET travels through, starting from the junction to ambient air, includes the junction-to-case thermal resistance, case-to-heatsink thermal resistance, and heatsink-to-ambient thermal resistance.

Step-by-step explanation:

The path of thermal resistances that the heat dissipated by the MOSFET travels through, starting from the junction to ambient air, is as follows:

• Junction-to-case thermal resistance: This is the resistance between the MOSFET junction and the case of the heatsink. It represents the resistance to heat transfer between the MOSFET and the heatsink.
• Case-to-heatsink thermal resistance: This is the resistance between the case of the heatsink and the heatsink itself. It represents the resistance to heat transfer between the case and the heatsink.
• Heatsink-to-ambient thermal resistance: This is the resistance between the heatsink and the ambient air. It represents the resistance to heat transfer between the heatsink and the surrounding environment.

By minimizing these thermal resistances, the heat dissipated by the MOSFET can be efficiently transferred to the ambient air, allowing for effective cooling.