Fairchild - AN-7502

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Contents

Power MOSFET Switching Waveforms A New Insight FAIRCHILD SEMICONDUCTOR 1 Application Note October 1999 AN 7502 The examination of power MOSFET voltage and current waveforms during switching transitions reveals that the device characterization now practiced by industry is inade quate In this Note device waveforms are explained by con sidering the interaction of a vertical JFET driven in cascode from a lateral MOSFET in combination with the interelec trode capacitances Particular attention is given to the drain voltage waveform and its dual slope nature The three terminal capacitances now published by the industry are shown to be valid only for zero drain current For cases where the gate drive is a voltage step generator with inter nal fixed resist ...