Suppressing MOSFET Gate Ringing in Converters: Selection of a Gate Resistor

Fairchild Semiconductor

Technology Paper

March 2003

To prevent gate ringing, while not harming efficiency, Fairchild recommends careful board layout, and use of a 4.7-Ohm gate resistor for every power MOSFET used in a switching converter; in particular, use a separate 4.7-Ohm gate resistor for each paralleled MOSFET.

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