N-FET for use in ~10W step-up converter - diyAudio
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Old 13th February 2005, 08:54 PM   #1
BWRX is offline BWRX  United States
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Default N-FET for use in ~10W step-up converter

does anyone know of a good N-channel FET that meets or exceeds these requirements:

1) Qg (total gate charge) less than or equal to 50 nC
2) Rds less than or equal to 50 mOhms
3) low Crss
4) at least 40V rating
5) at least 1A continuous rating (higher rating preferred)
6) low power dissipation, 5W max
7) must be in a package i can use with my breadboard (ex. TO-220)

i've been searching the spec sheets on digi-key and haven't come up with anything. i heard a good one to use is the Si9410DY but i don't where i could get some that are in a package i could use with my breadboard. anyone have any ideas or suggestions?
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Old 13th February 2005, 09:08 PM   #2
Tim__x is offline Tim__x  Canada
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How 'bout the IRLZ44N from IRF.

55v
RDS(on) 35 mohms
ID @ 25C 41A
ID @ 100C 29A
QG 32nc
Crss 120pf

IRLZ44N
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Old 13th February 2005, 09:29 PM   #3
BWRX is offline BWRX  United States
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the IRLZ44N has really good specs, but it dissipates too much power.

a transistor like the SI9410DY would be perfect, but i can't find them in a usable package.

http://www.fairchildsemi.com/ds/SI/SI9410DY.pdf

do you know where i could find one like that or something similar?
thanks for the help Tim.
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Old 13th February 2005, 09:36 PM   #4
Tim__x is offline Tim__x  Canada
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What do you mean it dissapates to much power? The power rating is how much it can dissapate without breaking, not how much it does.
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Old 13th February 2005, 10:45 PM   #5
BWRX is offline BWRX  United States
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hmm. right you are Tim. i don't know why i was thinking that. i'll probably order a couple of those to try out. thanks again for the help.
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