15-12-2012, 06:48 PM
Power MOSFETs
1Power MOSFETs.ppt (Size: 128 KB / Downloads: 112)
Two Types
Depletion Type
Channel region is already diffused between the Drain and Source
Deplete, or “pinch-off” the Channel
Enhancement Type
No channel region exists between the Drain and Source
“Invert” the region between the Drain and Source to induce a channel
Switching Waveforms and Times
Turn-on Delay, td(on) = time to charge the input capacitance to VT
Rise time, tr = Charging time to charge the input capacitance to the full gate voltage, VGSP in order to drive the transistor into the linear region of operation