The NTS4001 doesnt have an SOA chart but if you want I can perform a simple test 350mA at 100mS VGS 3.5.
The NTS4001 doesnt have an SOA chart but if you want I can perform a simple test 350mA at 100mS VGS 3.5.
Fairchild is one source, but they are generic and very common in designs for offshore manufacturing if you don't need a very high Vceo. TO-92 like the 2N7000. The "D" beta bin is only marginally more expensive.
Best regards, Spehro Pefhany
-- "it\'s the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
I just had one of those high-current SOT-23 suckers quit on a digital photo frame... took out the switching power supply adapter too. It was the switching element in LED backlight power supply. Wonder what the most rugged SOT-23 MOSFET is that I can buy from Digikey.
Best regards, Spehro Pefhany
-- "it\'s the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
I wondered who would spoy that!
martin
The 138 looks quite nice, thanks
martin
You'd have to put target numbers to the definition of "rugged". But mind that something will then have to drive its largish Cgs.
-- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
But they didn't say "enbrighten" :-)
I remember that Perry Rhodan (Sci-Fi books) had a serious influence on language in Germany when I was a kid.
-- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
Good point-- the Taiwan-designed PWM chip (BIT3251) is really rather wimpy-- 50 ohms output impedance (typical, no limits given), probably running at 5V, and it operates at a fairly high frequency (330kHz). No idea what the dead part is/was other than it's obviously an n-channel SOT-23 MOSFET.
Suggestions? If 20V is enough, I like the looks of the Zetex ZXMN2F30FHTA 4.9A, 0.045 ohms at 4.5V and only 4.8nC total gate charge. Best regards, Spehro Pefhany
-- "it\'s the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
I was curious on just what a tiny NTS4001 could take so I did some test. Here is the test setup I did on the breadboard.
There is about three inches of 22AWG between the TLC555 output and the NTS4001 gate.
I ran Vcc between 2.5VDC to 6VDC, Vcc equals Vgs. I have no way to adjust the ambient temp accurately but its about 25 degrees C. The NTS4001 is mounted on one of my homemade proto adapters. L=0.75 cm X
0.25cm. The drain tab is on a 0.4cm x 0.4cm 1oz copper pour.This is a non magnified view (scope capture) showing CH1= Vgs and CH2=VDS. The pulse length is 112mS. Vcc = 6VDC, IDS = 0.4A, VDS= 272mV. This was consistent even over 10 one shots at about ten second intervals.
The rest of the scope captures are higher resolution zooms of VDS. Magnified view 6VDC.
For Vcc = 3VDC,VDS= 0.228mV,Ids= 0.18A
For Vcc= 2.5Vdc , Vds= 292mV,Ids=0.147A
Not to shabby for a FET I paid 0.05 cents for (During one of there sales). Newark raised the price a bit to ten cents but still worth the money. As with most single and dual mosfets and bipolars I find Newark consistently is cheaper then Digikey most times significantly.
Whoops made a boo-boo the dimensions are L=0.75cm x W=0.6cm
It's a perfectly cromulent word.
Tim
-- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms
exxxcellent
martin
Thanks mucho for that, I don't really use Digikey, since I'm based in spain, only use Digikey for some eurounobtainium stuff like panasonic jog wheels
martin
No problem :)
I started reading that series in the early '70s. ACE had english translations, & I had every book they translated. His mutants would have fit right into the newsgroup, although most had better manners than our current crop of mutants. :(
-- http://improve-usenet.org/index.html If you have broadband, your ISP may have a NNTP news server included in your account: http://www.usenettools.net/ISP.htm There are two kinds of people on this earth: The crazy, and the insane. The first sign of insanity is denying that you\'re crazy.
I usually go by whatever Digikey has, preferably a five-digit qty of stocked parts. Got to throw it on Spice to see what the switching losses will be with a 50ohm driver. At 330kHz probably not a pretty picture.
-- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
If you are going to use an external current limiting resistor, what the hell difference does it make if your fet has a few ohms of Rds unless you can't heat sink a watt and a half or so for a few milliseconds (and you really didn't specify duty cycle)? There really are only a couple of choices ... heat sink the fet or heat sink the cl resistor. Me? I'd look at a SMD variant of the 2N7000 and see what the peak pulse current/power capability is.
Jim
-- "It is the mark of an educated mind to be able to entertain a thought without accepting it." --Aristotle
Looks like he wants to do short pulses of defined brightness. Then the Rdson does matter. At low duty cycle it won't blow up.
-- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
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