Difference between revisions of "Heatsinks"
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===Poor TO-220 Heatsinking=== | ===Poor TO-220 Heatsinking=== | ||
| − | [[File:Boardmount heatsink.jpg|200px|thumb|right|These heatsinks can have the TO-220 bended on them, and the heatsink bolted to the board. It's also possible to get a top cover for them as well. Some of these, will apply a bit of pressure to make good contact.]] | + | [[File:Boardmount heatsink.jpg|200px|thumb|right|These heatsinks can have the TO-220 bended on them, and the heatsink bolted to the board. It's also possible to get a top cover for them as well. Some of these, will apply a bit of pressure (on the top half) to make good contact. Essentially sandwiching the case to the heatsink.]] |
I repaired an audiophile power supply, with loose to-220's underneath the board. They were loosely hanging over a sil pad and then not really making contact with the bottom of the chassis. This is of course, the wrong way to heatsink TO-220's. Given that the majority of the power was to go through these transistors, this was a bad design choice. While there are stand up heatsinks, which you see most of the time, there are also board mount heatsinks, where you will bend the TO-220 90 degrees, and then screw it into a heatsink, and into the board (optionally with sil pad). See the photos. | I repaired an audiophile power supply, with loose to-220's underneath the board. They were loosely hanging over a sil pad and then not really making contact with the bottom of the chassis. This is of course, the wrong way to heatsink TO-220's. Given that the majority of the power was to go through these transistors, this was a bad design choice. While there are stand up heatsinks, which you see most of the time, there are also board mount heatsinks, where you will bend the TO-220 90 degrees, and then screw it into a heatsink, and into the board (optionally with sil pad). See the photos. | ||
[[Category:online notes]] | [[Category:online notes]] | ||
Revision as of 01:56, 22 January 2025
Heatsinks are easily reused components. They are also easy to DIY, if you have a mill.
List
- https://www.eevblog.com/forum/projects/heatsink-for-power-so8-package/msg5763881/?topicseen#msg5763881 Interesting piece of sheet metal bonded to a power so8 package. Maybe it's using thermal glue.
Poor TO-220 Heatsinking
I repaired an audiophile power supply, with loose to-220's underneath the board. They were loosely hanging over a sil pad and then not really making contact with the bottom of the chassis. This is of course, the wrong way to heatsink TO-220's. Given that the majority of the power was to go through these transistors, this was a bad design choice. While there are stand up heatsinks, which you see most of the time, there are also board mount heatsinks, where you will bend the TO-220 90 degrees, and then screw it into a heatsink, and into the board (optionally with sil pad). See the photos.
