Mosfet 7.5% increase in RDSON between 25C and 100C
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From: Hammy on 14 Jan 2010 06:25 On Wed, 13 Jan 2010 20:24:57 -0800, Mycelium <mycelium(a)thematrixattheendofthemushroomstem.org> wrote: >On Wed, 13 Jan 2010 21:12:31 -0500, Hammy <spam(a)spam.com> wrote: > >> >>Anybody hear of a mosfet that only has a 7.5% increase in RDSON >>between 25C and 100C. >> >>Because according to ST the STD15NF10 is just such a mosfet. >> >>I'm guessing this is a typo. >> >>Data sheet pg7 figure 11. >> >>http://www.st.com/stonline/products/literature/ds/7080.pdf >\ > > Look at the Zetex offerings. They have some amazing devices. Zetex doesn't exist anymore they've been bought out by Diodes. While they do have some decent low Vce sat BJT's they are pricey. They also don't make the best high speed switches without elaborate drive circuits. Onsemi offers similar low Vce sat BJT's for about half the price. The Mosfet offerings particularly up around 100V are slim in the sub 1 to 3 ohm range let alone the 0.065 ohm of the ST FET I linked to with 20nC gate charge at the Vgs I'll be switching it at 7 to 9V (300kHz). I paid about 35 cents CT for the ST part if zetex has something comparable I'd be interested but I'll save you the trouble they don't.
From: Tim Williams on 14 Jan 2010 10:52
"Hammy" <spam(a)spam.com> wrote in message news:6ovtk5dup8ef7pc4vgoui3k17fac21m7aq(a)4ax.com... > While they do have some decent low Vce sat BJT's they are pricey. They > also don't make the best high speed switches without elaborate drive > circuits. Onsemi offers similar low Vce sat BJT's for about half the > price. Just searching for them turns up lots of similar parts. I found the KSC5001 one time, IIRC that's 20V 7A, hFE > 80 and Vce(sat) < 0.3V at 7A, hFE = 80! Hell, all the Zetex parts were spec'd for hFE = 10 (though they do just fine as high as 100). Plus, it's in a DPAK, so unlike anything Zetex, it can actually handle momentary overload. ;-) There are some particularly interesting CCFL driver transistors out there for laptop use. 80V 5A and similar hFE and Vce(sat) comes to mind. They're as good as the SWITCHMODE series e.g. MJE13003 but with lower Vceo and correspondingly better performance. And there's all those MOSFETs, like the D2PAKs littered over any motherboard. Pretty nice performance from them, too. And IGBT prices keep falling. This is an excellent age for transistors. Tim -- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms |