Between 1.8V and 3V would be more realistic.Eva said:
12A 600V sic-diode from infineon for example have voltage drop at 12A 1.5V typ. at 25c and 2.1V max. at 100c. Now if you compare that to ultra(hyper)fast recovery Si-diode like ISL9R1560PF2 designed for boost-converter use you have 1.8v typ at 15A and 25c.
I agree that SiC-diodes are expensiive, 12A diode costs 17 euros.
mzzj you know how I think 😀
I use 1 euro MUR1560 diodes that feature 1.4V drop for 15A/25ºC and I still have the other 16 euros to pay for a custom coil to keep di/dt under control 😀
And I end up with smaller and cooler heatsinks as a bonus 😎
I use 1 euro MUR1560 diodes that feature 1.4V drop for 15A/25ºC and I still have the other 16 euros to pay for a custom coil to keep di/dt under control 😀
And I end up with smaller and cooler heatsinks as a bonus 😎
I have recently analysed and discussed that here:
http://www.diyaudio.com/forums/showthread.php?s=&threadid=76958
I can't see an easy way to implement it in four quadrant systems (high voltage >250V class-D), though.
http://www.diyaudio.com/forums/showthread.php?s=&threadid=76958
I can't see an easy way to implement it in four quadrant systems (high voltage >250V class-D), though.
USA patent system is a joke. These documents show the exact same thing patented three times by three different inventors!!! Damn, I want my patent too!! 😀
Yes. They are many examples and apparently they are no complains…
Anyway the circuit seems to be a working solution.
Here: http://www.crestaudio.com/media/pdf/lt_schematic.pdf on page 5 only passive snubber and no dead-time circuit.
The circuit looks like the US4724396.
Anyway the circuit seems to be a working solution.
Here: http://www.crestaudio.com/media/pdf/lt_schematic.pdf on page 5 only passive snubber and no dead-time circuit.
The circuit looks like the US4724396.
I have seen a similar patent to ESBT years ago and didn't understand why will it work. If the bipolar transistor goes to saturation, the bias supply will feed his c-b junction's recovery current. I think the c-b junction could be damaged if the MOSFET is switching off too fast. 🙄 ?
Has anyone tried 8SOIC high/low driver UCC27200 for classD? Propagation delay is faster than IR driver, but with smaller max voltage.
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