I'm comparing datasheets for two MOSFETS - a Fairchild FCPF20N60 and an Infineon SPA20N60C3. They have similar specs except in switching times where the SPA20N60C3 appears to be hugely faster. Can this be mostly due to the fact that the Fairchild device is specced for Rg of 25 ohms whereas the Infineon product is specced for 3.6 ohms (note the decimal point)? Gate charges and input and output capacitances are similar although the reverse transfer cap of the Fairchild device is about twice that of the other one.
- posted
9 years ago