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Old 01-12-2011, 09:38 PM   #4 (permalink)
DJBecker
EcoModding Apprentice
 
Join Date: Nov 2010
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Gate current

Gate current

How much current does the gate driver use? (Technically, almost none,
but we can't recover any of the power from the gate charge.)

This is easy to calculate with the right graph from the datasheet. The
number we are looking for is the total gate charge at our operating
conditions (gate voltage, device current and traction voltage). If the
total gate charge is 378nC, we multiply that by our PWM frequency of
16KHz to get amps: 378nC * 16KHz = 6mA. For 10 devices that requires a
supply of 60mA
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