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| cooling SMC triacs in D2PAK? |
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| Jeroen3:
I would go for a lower height, higher fin density heatsink that mounts the TO package between the board and the heatsink. It does require bending of the TO pins, but it immediately screws to the heatsink in an area where you can actually tap thread. Plus, strain is put on the TO leads bend instead of the FR4. Cracked joints are far less likely. But I do not know the application. However, if you require cheap manufacturing steps (which my way is not) you should look into heatsink that solder into the board and use clips to press against the TO package. As often in ATX power supplies. Eg: Fischer SK 525 of SK 573. You skip the step to mill and tap the heatsink. And you don't need to screw things during assembly. |
| max_torque:
Heat sink is already drilled for mounting by the manufacturer. Triacs will be held to sides of heat sink with "C" spring clips as mentioned (constant force, but allow for some movement) and in the vertical orientation the legs of the Triacs are left long so they can flex if necessary rather than stress the pcb. Heat sink is rated at 11W for a 60DegC deltaT with natural convection or 2.0 degC/watt at 300 ft/min blown air. |
| T3sl4co1l:
That duct is tiny, is there no way to get a more direct flow path? Could for instance use two half size, higher performance fans, and shrink the board away from them so there's more room to turn the flow around. Or use a turbine style (a low performance one would still be quiet -- think laptop versus leafblower) that naturally blows to the side. Tim |
| max_torque:
The duct is actually just over 65% of the swept area of the fan, so it's fine, it looks smaller than it is! (and the exit duct is not yet final, it's just a placeholder in the CAD to see how things sit together) |
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