 ZVS MOSFET question
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cbfull
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Thu Oct 27 2011, 08:07PM
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Registered Member #187
Joined: Thu Feb 16 2006, 02:54PM
Location: Central Ohio
Posts: 140
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I notice that it says on the ZVS schematic that the MOSFET must have an Rds of 0.150 Ohms or less, but a lot of HVers seem to have no trouble using the IRFP460 which has Rds of 0.270 Ohms. What sort of problems could a higher Rds cause? I've been digging around for a few days to find an answer and haven't found any comments about that.
I ask because I have a couple of sleeves of the IRFP460's
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Myke
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Registered Member #540
Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969
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As far as I know, the only downside of a high Rds is the MOSFETs dissipate more power as they
drop more voltage. This makes your driver less efficient but it should still work. Just make sure you
use a suitable heat sink so they don't get too hot. Remember, the MOSFETs need to be electrically
insulated from a common heatsink otherwise you short out your driver.
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