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Old 06-05-2009, 11:08 AM   #96 (permalink)
arnolde
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I'm doing the excel sheet myself, so I can only implement what I've already understood. Which doesnt include this issue yet ;-)

Anyway, now at least I understand why in the abovementioned Eq.12 on Page 52 of the magazine, the gate current influences the switching losses.

Now, how am I to determine if I want my switching time to be 0.1µS or 1µS or 10µS? Basically I'm limited to the NE555 output capability, and according to the circuit design, the gate is sunk directly but sourced (pulled up) by a 10k resistor to 12V, so the current is limited anyway to way under 100mA unless I change that. But it seems the thread opener's setup is working fine in that respect.
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