Author Topic: Whats wrong with SMD FETs on PCB lying on top of metal plate/heatsink?  (Read 568 times)

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Offline FaringdonTopic starter

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What's wrong with heatsinking SMPS SMD FETs by having them on a PCB, with thermal vias going through to bottom copper pour...then 0.05mm thin thermal/insulator pad....then that PCB screwed to a metal heatsink/plate?

...Why instead,  do people put the SMD FETs on the bottom side of the PCB, then gouge out a divet in the metal plate for the said FETs, then gap-pad the SMD FET tops to the metal plate?
'Perfection' is the enemy of 'perfectly satisfactory'
 

Online jpanhalt

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Re: Whats wrong with SMD FETs on PCB lying on top of metal plate/heatsink?
« Reply #1 on: November 26, 2022, 08:27:15 pm »
It's a trade secret.  Publishing it here might get me deposed by my customer's, customer's, customer.
 
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