MOSFET Susceptibility to Cross Conduction

Focus:

Equations are derived that determine the susceptibility of a given MOSFET to shoot-through in synchronous buck converter designs including applications with sub-nanosecond rise and fall times. The impact of MOSFET gate inductance and source inductance on shoot-through are analyzed.

What you’ll learn:

• How to determine the suitability of a given MOSFET for use as the synchronous rectifier in synchronous buck converter designs
• How to determine the susceptibility of a MOSFET to shoot-through in synchronous buck converter designs
• How to understand the impact of MOSFET gate inductance and source inductance on shoot through (cross conduction) in synchronous buck converters

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Author & Publication:

Alan Elbanhawy, Director, Computing and Telecommunications Segments Advanced Powersystems Center, Fairchild Semiconductor, San Jose, Calif., Power Electronics Technology, Apr 01 2005

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