N-FET for use in ~10W step-up converter

BWRX · 13th February 2005, 08:54 PM

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?

Tim__x · 13th February 2005, 09:08 PM

How 'bout the IRLZ44N from IRF.

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

IRLZ44N

BWRX · 13th February 2005, 09:29 PM

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.

Tim__x · 13th February 2005, 09:36 PM

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.

BWRX · 13th February 2005, 10:45 PM

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.

13th February 2005, 08:54 PM	#1
BWRX diyAudio Moderator Emeritus Join Date: Jan 2005 Location: Pennsylvania	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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13th February 2005, 09:08 PM	#2
Tim__x diyAudio Member Join Date: Jun 2004 Location: Edmonton area, Alberta	How 'bout the IRLZ44N from IRF. 55v RDS(on) 35 mohms ID @ 25C 41A ID @ 100C 29A QG 32nc Crss 120pf IRLZ44N

13th February 2005, 09:29 PM	#3
BWRX diyAudio Moderator Emeritus Join Date: Jan 2005 Location: Pennsylvania	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.

13th February 2005, 09:36 PM	#4
Tim__x diyAudio Member Join Date: Jun 2004 Location: Edmonton area, Alberta	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.

13th February 2005, 10:45 PM	#5
BWRX diyAudio Moderator Emeritus Join Date: Jan 2005 Location: Pennsylvania	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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