problem with IRF 840 and IRF 540- burns out

[linju]

why IIRF 840 and IRF 540 burns out when a 220V DC given as Vds and incandescent lamp as load(60W) and 10 V Vgs
it works for some time and burns

 

[FvM]

IRF540 has 100 V Vds rating and can't work. For IRF840, it's essential that the gate soure voltage rises fast enough, e.g. < 1 ms, otherwise the safe operation area would be exceeded. Lamp inrush current of about 3 A won't be a problem if the transistor is switched fast enough.

 

[linju]

IRF540 has 100 V Vds rating and can't work. For IRF840, it's essential that the gate soure voltage rises fast enough, e.g. < 1 ms, otherwise the safe operation area would be exceeded. Lamp inrush current of about 3 A won't be a problem if the transistor is switched fast enough.

thank you so much so if i am using irf 840 as u said i should increase the Vgs as soon as the MOSFET is triggered?

 

[FvM]

How did you generate Vgs when the transistor damage was observed? Can it be that slow rising or even floating Vgs occured?

 

[syenidogan]

How did you generate Vgs when the transistor damage was observed? Can it be that slow rising or even floating Vgs occured?

what does floating vgs mean?