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Optimization of power MOSFET body diode for speed and ruggedness

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4 Author(s)
Yilmaz, Hamza ; Siliconix Inc., Santa Clara, CA, USA ; Owyang, K. ; Shafer, Peter O. ; Borman, C.C.

The built-in diode in the power MOSFET can be used as an integral flyback diode in a power electronics circuit. However, if the power MOSFET is not optimized for utilization of the built-in diode, it can catastrophically fail during the diode mode of operation. A failure mechanism is proposed and discussed. It is found that through improved design with optimized cell geometry, vertical device structure, and electron irradiation, a rugged power MOSFET can be made such that the built-in diode will operate successfully as a flyback diode without inducing failure to the power MOSFET device

Published in:

Industry Applications, IEEE Transactions on  (Volume:26 ,  Issue: 4 )

Date of Publication:

Jul/Aug 1990

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