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Old 07-08-2010, 04:06 PM   #3536 (permalink)
jyanof
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Quote:
Originally Posted by jackbauer View Post
You can drive an igbt with 12v (i am). It will turn fully on just a bit slower which will increase switching losses and heat.
hm, I took a look at some data sheets and it looks like there really isn't a difference in saturation voltage for 12v and 15v, though I don't know what are exactly in the LS power board. But, they were likely driven with 15v before, so the gate resistors are probably sized as such. As you say, they're likely turning on quite a bit slower and increasing the switching losses.

Also, it would be good to know what the values of the gate resistors are and determine if the current driver can even supply the required drive current.
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