EEVblog Electronics Community Forum
Electronics => Repair => Topic started by: Trurl on January 03, 2020, 03:21:16 am
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My failed Dell monitor(2407WFPb) psu
https://www.scribd.com/doc/207782153/Dell-2407-WFP-Power-Supply-Rev-A11-Schematic-Diagram (https://www.scribd.com/doc/207782153/Dell-2407-WFP-Power-Supply-Rev-A11-Schematic-Diagram)
has a TO-3P MOSFET(Fuji 2SK3548-01SC)
https://www.datasheetq.com/datasheet-download/139786/1/Fuji/2SK3548 (https://www.datasheetq.com/datasheet-download/139786/1/Fuji/2SK3548)
which needs an alternative replacement.
My initial choice:
ON Semi(Fairchild) FQA11N90_F109
https://www.onsemi.com/pub/Collateral/FQA11N90_F109-D.PDF (https://www.onsemi.com/pub/Collateral/FQA11N90_F109-D.PDF)
has 11A Drain Current(1A higher than the 10A of the Fuji), but I noticed that the Rds(On) is quite lower and Qg is quite higher as well.
So now I'm considering a 9A Drain Current version with Rds(On) and Qg much closer to the original.
ON Semi(Fairchild) FQA9N90C_F109
https://www.onsemi.com/pub/Collateral/FQA9N90C_F109-D.PDF (https://www.onsemi.com/pub/Collateral/FQA9N90C_F109-D.PDF)
I'm thinkin' that the 9A Drain Current spec is conservative as there are references to 11A in the Turn On Times and Gate Charges Test Conditions.
I think the 9A version would be an overall closer match to the original part than the 11A version. Which do you think would be the safer/better choice?
Thanks…