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Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
Look at the Trise, Ton, Tfall, Toff times
But if you look at the load current rating vs frequency in the datasheet, you will see how careful you have to do your switching to avoid blow igbts :)
Registered Member #2481
Joined: Mon Nov 23 2009, 03:07PM
Location: ITALY
Posts: 134
Considering the delay/rise/fall time I would say that the maximum frequency for such device could be around 200-300 KHz, in soft switch (almost zero current at switching).
Anyway, with a total gate charge of 160nC you need a powerful gate driver to switch such device at 300KHz...
Personally I would not go above 100-150KHz with such device.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
The switching times are not that bad, you'll probably need to introduce some deadtime however (either passive - parallel RD on the gates, or active by delaying the gate drive switching transitions), I think these could do 350Khz just fine.
But yes, if you want to run the gatedriver uninterrupted, you will probably need to parallel more or use the drivers which screw on a heatsink.
Registered Member #2161
Joined: Fri Jun 05 2009, 03:36PM
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Posts: 247
Come on guys, 160 nC isn't that bad. A pair of UCC's will drive a half bridge.
I am running a half-bridge of 320 nC MOSFETs in my SSTC with the Fo being 400kHz. Interrupted no issues 15+ min. run. For CW I have a small heatsink glued on the packages, heat isn't too large of an issue. Since these transistors are going in a DRSSTC, I don't think he will have much issue as far as the gate drive portion is concerned. Though as Luca mentioned some TO-220 9A drivers are always a good idea, for peace of mind and a clean build.
Registered Member #2481
Joined: Mon Nov 23 2009, 03:07PM
Location: ITALY
Posts: 134
I think that they say 60-150k because they refer to "hard switching", in resonant mode you gan go for shure faster, if your gate driver is powerful enough.
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speed of igbt
A pair of UCC's will drive a half bridge.