Cree is a manufacturer. It is almost impossible to get more than a 100v rating in silicon when making a Schottky diode, so they make high voltage ones from silicon carbide, up to 1200 volts. (It is possible in theory to make even higher voltage diodes from diamond crystals, but it's challenging!)
Schottky diodes have no reverse recovery at all; they are like tube rectifiers in that respect. The FREDs, fast recovery, ultra-fast recovery etc. designs reduce the magnitude of the reverse recovery spike, but cannot eliminate it.
Hi Paul,
I got my hands on a pair of Cree CSD01060a as used in the Mainline kit and just want to be 100% i have a suitable part before installing them. Looking at the datasheets for the UF4007 vs CSD01060 a few differences jump out at me,
1) Max Reverse voltage of 1000v for the UF vs 600v for the CS. I assume this only comes into play on powerdown when the transformer shuts down and the caps are still charged, or is my understanding of that totally off? Are we still within the safe working range for these diodes?
2) Average rectified forward current of ~10amp for the UF vs 1.4-2.2amp for the CSD. Looking at the tube datasheets it lists the plate current for both sections being ~68ma and ~150ma so am i right in saying the total load of the four section will be well within 1amp, + whatever the startup current maybe will still be within that safe rating?
3) Forward voltages are pretty much identical so nothing to worry about there.
4) Heat sinks shouldn't be required assuming the current load is as low as above, however the metal tab is live to the output so covering in heat shrink would be a sensible idea.
Anything else i should be aware of?
Cheers,
Mark
