im experimenting with some old ATX power supplies. ive yet to open an ATX using MOSFETS, most of them are using BJTs like MJE13007 or 13009 or similar.
these power supplies are said to be 500W but i think theyre just around 150W continuous duty. ive been building and tinkering with SMPS's only on a practical level so i wouldnt know the science behind these.
i believe that at these "low" power operation, the current drive for the BJT is lesser than the switching losses in a MOSFET?
does this BJT current drive requirement become lesser at lower power level? whereas the MOSFET has constant drive requirements at any power level?
so i was thinking, when does the switching losses in a mosfet become lesser than the diode/current drive required by BJTs?
i am thinking of improving efficiency and going fanless for an experimental computer CPU i am building.
these power supplies are said to be 500W but i think theyre just around 150W continuous duty. ive been building and tinkering with SMPS's only on a practical level so i wouldnt know the science behind these.
i believe that at these "low" power operation, the current drive for the BJT is lesser than the switching losses in a MOSFET?
does this BJT current drive requirement become lesser at lower power level? whereas the MOSFET has constant drive requirements at any power level?
so i was thinking, when does the switching losses in a mosfet become lesser than the diode/current drive required by BJTs?
i am thinking of improving efficiency and going fanless for an experimental computer CPU i am building.