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Continuous mode Boost PFC diode must be SiC?

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treez

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Hi

Would you agree that due to the down-pricing of SiC diodes to today’s low prices , only very , very misguided people would be using anything other than a SiC diode in a Continuous conduction mode Boost PFC converter?
I mean, the reverse recovery transient through an ultra fast diode heats up both diode and FET, and causes extra EMC problems…..i mean, seriously, anything other than SiC for a CCM Boost PFC diode is surely utter madness?


*…Ultra-fast “Q speed” PFC diode; 600V, 3A …….LQA03TC600 ($0.53 per 1000)
LQA03TC600 datasheet:
https://ac-dc.power.com/sites/default/files/product-docs/lqa03tc600.pdf?download=1

*…SiC diode 600v 3 A diode;…….. C3D03060F ($0.8 per 1000)
C3D03060F datasheet:
https://www.wolfspeed.com/downloads/dl/file/id/39/product/62/c3d03060f.pdf

*…Ultra fast 600V, 3A diode; ………… VS-ETX1506FP-M3 ($0.62 per 1000)
https://www.vishay.com/docs/93549/vs-etx1506fpm3.pdf
 

does the design meet form fit and function?
then it makes sense to use the less expensive parts

i'm not sure i would go so far as to say "misguided"

there are other things that go into part choices,
such as the local culture and experience,
manufacturer, availability, preferred vendors, etc.
there is always a certain amount of "this is the way we do it"
and "not invented here"
 
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Certainly less heat in the mosfet ( no larg e turn on current spike due to Irr max ) - less RFI in general ( maybe more at VHF 100 - 400MHz )

less heat in the diode in general - so yes if the budget will stand it - a good quality SiC is the way to go

check for cold start impulses in the diode though ...
 
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