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Why there is such a large difference between Typ and max values if conditions are same? I tried to quickly search around and did not find papers that would reveal if Fuji and powerex have different way of measuring these delays though.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Well, I don't know, for smaller TO2xx parts the MAX values are usually just a bit larger than the typical ones. What bothers me though, are the ratings for resistive load switching, this is of absolutely no use in reality.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
I always ignore the typical values in datasheets. I don't know why they even print them. The only values that the manufacturer will guarantee are the worst-case ones (min or max as appropriate) so I use those for all calculations. Then in production, every part they send me should work.
That's for mass production. For one-off builds you can test every set of transistors you use, look at the switching waveforms, measure the temperature rise and decide how far you want to push them, setting your phase lead and current limit accordingly.
The times all vary with temperature, so you need to factor in the worst-case temperature too.
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Transistor electrical characterics: typical/max switching delays
