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view source for power mosfet wikipedia jump to content main menu main menu move to sidebar hide navigation main page contents current events random article about wikipedia contact us contribute help learn to edit community portal recent changes upload file special pages search search appearance donate create account log in personal tools donate create account log in view source for power mosfet add languages article talk english read edit view history tools tools move to sidebar hide actions read edit view history general what links here related changes upload file page information get shortened url switch to legacy parser in other projects wikidata item appearance move to sidebar hide power mosfet you do not have permission to edit this page for the following reason this ip address range has been globally blocked this does not affect your ability to read wikipedia pages most people who see this message have done nothing wrong some kinds of blocks restrict editing from specific service providers or telecom companies in response to recent abuse or vandalism and can sometimes affect other users who are unrelated to that abuse review the information below for assistance if you do not believe that you have done anything wrong this block affects editing on all wikimedia wikis the ip address or range 5 135 0 0 16 has been globally blocked by jon kolbert for the following reason s open proxy webhost visit the faq if you are affected this block will expire on 04 29 8 january 2027 your current ip address is 5 135 42 194 even while globally blocked you will usually still be able to edit pages on meta wiki if you believe you were blocked by mistake you can find additional information and instructions in the stewards block wizard other useful links global blocks help i have been blocked you can view and copy the source of this page packaging inductances to operate the mosfet must be connected to the external circuit most of the time using wire bonding although alternative techniques are investigated these connections exhibit a parasitic inductance which is in no way specific to the mosfet technology but has important effects because of the high commutation speeds parasitic inductances tend to maintain their current constant and generate overvoltage during the transistor turn off resulting in increasing commutation losses a parasitic inductance can be associated with each terminal of the mosfet they have different effects the gate inductance has little influence assuming it is lower than some hundreds of nanohenries because the current gradients on the gate are relatively slow in some cases however the gate inductance and the input capacitance of the transistor can constitute an electronic oscillator oscillator this must be avoided as it results in very high commutation losses up to the destruction of the device on a typical design parasitic inductances are kept low enough to prevent this phenomenon the drain inductance tends to reduce the drain voltage when the mosfet turns on so it reduces turn on losses however as it creates an overvoltage during turn off it increases turn off losses the source parasitic inductance has the same behaviour as the drain inductance plus a feedback effect that makes commutation last longer thus increasing commutation losses at the beginning of a fast turn on due to the source inductance the voltage at the source on the die will be able to jump up as well as the gate voltage the internal v sub gs sub voltage will remain low for a longer time therefore delaying turn on at the beginning of a fast turn off as current through the source inductance decreases sharply the resulting voltage across it goes negative with respect to the lead outside the package raising the internal v sub gs sub voltage keeping the mosfet on and therefore delaying turn off return to power mosfet retrieved from https en wikipedia org wiki power_mosfet privacy policy about wikipedia disclaimers contact wikipedia legal safety contacts code of conduct developers statistics cookie statement mobile view search search view source for power mosfet add languages add topic