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Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
I am looking for some SOT-227 IGBTs for some of my projects, namely drsstc's. However, i cannot seem to find many which have previously been tested in drsstcs with good results. The IXGN60N60C2D1 is the only one i can seem to find Too bad they don't have any without the antiparallel diode in stock, i could use my own external freewheeling diode. I tried searching digikey, but they do not have a filter for sot-227's.
I am planning on attempting to make a 'QCW drsstc', which would require the IGBT to switch in the neighborhood of 100 amps for a very long on time as compared to a typical drsstc. This means there will be plenty of heat generated, and the IGBT die must be able to dissipate the heat fast enough. Also, the frequency i would need them to switch will be high, something like 300KHz.
What ISOTOP IGBTs have been proven in drsstc's? I need at least one fullbridge of them, but i don't have a ton of money to spend. If anyone has IGBTs they would like to trade, i would be willing to trade something like brick IGBTs. If not i can buy them, provided i can find some cheap enough.
Registered Member #33
Joined: Sat Feb 04 2006, 01:31PM
Location: Norway
Posts: 971
I think the internal diodes should be good enough, they are often quite fast and beefy in IGBTs.
It's a common myth that SOT-227s have lower thermal impedance than TO-247s. This is mostly not true. The thing with SOT-227s is that the IGBT is electrically insulated, and it will perform better than a TO-247 with external sil-pad insulation. But with the device mounted directly to a heatsink, a TO-247 will have lower thermal impedance. In this case, the TO-247 will not be insulated from the heatsink, and you need to use a seperate heatsink for each device, but this can be a small price to pay to get away with much cheaper IGBTs (especially if you plan on blowing any up during testing, and don't tell me this won't happen).
Proof?
the classic HGT1N40N60A4D that we all know and love, in SOT-227, thermal resistance junction-case = 0.42 k/w
HGTG40N60A4, the same IGBT die in TO-247, minus diode (no room for it in a TO-247, due to the big IGBT die), thermal resistance junction-case = 0.2 k/w, over twice as good.
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Anders M. wrote ...
I think the internal diodes should be good enough, they are often quite fast and beefy in IGBTs.
It's a common myth that SOT-227s have lower thermal impedance than TO-247s. This is mostly not true. The thing with SOT-227s is that the IGBT is electrically insulated, and it will perform better than a TO-247 with external sil-pad insulation. But with the device mounted directly to a heatsink, a TO-247 will have lower thermal impedance. In this case, the TO-247 will not be insulated from the heatsink, and you need to use a seperate heatsink for each device, but this can be a small price to pay to get away with much cheaper IGBTs (especially if you plan on blowing any up during testing, and don't tell me this won't happen).
Proof?
the classic HGT1N40N60A4D that we all know and love, in SOT-227, thermal resistance junction-case = 0.42 k/w
HGTG40N60A4, the same IGBT die in TO-247, minus diode (no room for it in a TO-247, due to the big IGBT die), thermal resistance junction-case = 0.2 k/w, over twice as good.
What i meant about the internal diodes is that an IGBT that is not copackaged is much much cheaper than one with the diode, almost half the price in the case of the IXGN60N60C2(D1) on digikey. I would use an external diode if i got one without the copackaged diode.
Yea, that makes sense about the thermal impedance. However, i don't have any heatsinks suitable for a separate heatsink for each IGBT, so i would have to use sil-pads in the case of to-247 IGBTs.
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Looking for SOT-227 IGBTs.
