Mosfets 101

[STEvil]

I'll poke at this as time goes by... and if anyone knows a good substitute mosfet for the 5N05HD then let me know.. I fried 8 of them :D



The basics:

http://72.14.253.104/search?q=cache:aItYKAosoPwJ:homepages.which.net/~paul.hills/SpeedControl/MosfetBody.html+parallel+mosfet&hl=en&ct=clnk&cd=3&gl=ca&client=firefox-a

Strapping:

Scroll down to point #5: http://72.14.253.104/search?q=cache:SNc1oEeYyI4J:www.powerdesigners.com/InfoWeb/design_center/articles/MOSFETs/mosfets.shtm+parallel+mosfet&hl=en&ct=clnk&cd=1&gl=ca&client=firefox-a
Ferrite Beads to remove parasitic oscillations: http://www.microsemi.com/micnotes/APT0402.pdf

[fart_plume]

As your tech sheet states at the bottom you can pggiy back mosfets(do this all the time in robotics) to improve power handling and heat disapation, when one mosfet reachs it's heat limit the other takes up the load allowing the the other to cool.

[STEvil]

Yes... "strapping" ;)

Going to "strap" an amplifer but I need to find some more part numbers on it first as there are a few burned transistors...

[fart_plume]

has anyone tried piggybacking the mosfets on a mobo yet to stabilize an overclock?

[STEvil]

not that i've ever seen.

[largon]

Many, many mobos have parallel 'fets out-of-the-box. I reckon piggy backing would be somewhat useful for those highly OC'able video cards with cut-down phases like 8800GT, but how would you cram more fets on an already cramped PCB?

[fart_plume]

Personally I'd use short wires and mount them to a big heat sink..........

[Xel'Naga]

I'll poke at this as time goes by... and if anyone knows a good substitute mosfet for the 5N05HD then let me know.. I fried 8 of them.
Let me guess: 4-phase mobo with quad on LN2? :D

[STEvil]

Personally I'd use short wires and mount them to a big heat sink..........

Just connect the pins directly, no wires needed... except from the back.

Heatsinks, heatplates, etc.. all good.

4-phase mobo.. hmmm.. good idea ;)

Just need a cpu with a high multi though :(