 Mosfet stacking
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Steve Conner
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Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
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U4R1A wrote ...
But the question will putting 2 mosfets in parallel(even worse case 1 hogging more power) allow for overall cooler mosfets then just one at the same load?
Yes. In a switchmode power supply the MOSFETs operate in their ohmic region, they look like low value resistors when on. That's why the datasheet quotes Rds(on). So paralleling them will result in more efficient operation, as Ohm's law would predict.
I've used 4 55 amp MOSFETs in parallel, for a switching circuit that had to deliver 60A with high efficiency. No heatsink was required 
All that Richie says is of course true.
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