What is the best strategy for heat sinking a MOSFET? I have a heat sink all picked out here. I also have a MOSFET picked out here. I know that the tab is electrified with the drain. There are a few choices on how to electrically connect the MOSFET to the heat sink.
- Set the heat sink to the same potential as the drain and not isolate the tab.
- Set the heat sink to the same potential as the drain and isolate the tab with a sill pad.
- Leave the heat sink floating and not isolate the tab.
- Leave the heat sink floating and isolate the tab with a sill pad.
- Ground the heat sink and isolate the tab with a sill pad.
What is the best option? Am I missing anything?
The MOSFET will be used along with an MCP73844-8.4 to charge a 2 cell lithium ion at 1A. From my understanding the chip throttle the MOSFET and does not use any high speed switching. The input voltage for charging is going to be around 10V.
There will be no enclosure. The heat sink will be upright in open air.