IR is insane
in [Design]
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From: John Larkin on 19 Mar 2010 14:31 On Fri, 19 Mar 2010 08:24:16 -0700, Muzaffer Kal <kal(a)dspia.com> wrote: >I am not sure how they come up with 375W but here is a simple >calculation: The package's thermal resistance is 40 C/W when mounted >on a 1 inchsq 1 ounce copper pad (I usually don't even have that much >area but multi-layer helps) so if you limit junction to 150 C, the max >one can do is 3.75W which comes out to ~38 Amps. Sanity, at last! John
From: Artemus on 19 Mar 2010 19:37 "John Larkin" <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote in message news:cpb5q5p2013r34ainnmcrdfjml4ifvp03g(a)4ax.com... > Just got a short-form IR mosfet thing in the mail. > > They have a PQFN 5x6 mm package they rate at 104 amps. And a D2PAK > rated for 340 amps. > > John > Anybody here remember the Signetics WOM? As I recall it was intro'd back in 1972 about this time of year. Maybe IR is following suit? Art
From: John Larkin on 19 Mar 2010 18:45 On Fri, 19 Mar 2010 15:37:26 -0800, "Artemus" <bogus(a)invalid.org> wrote: > >"John Larkin" <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote in message >news:cpb5q5p2013r34ainnmcrdfjml4ifvp03g(a)4ax.com... >> Just got a short-form IR mosfet thing in the mail. >> >> They have a PQFN 5x6 mm package they rate at 104 amps. And a D2PAK >> rated for 340 amps. >> >> John >> >Anybody here remember the Signetics WOM? >As I recall it was intro'd back in 1972 about this time of year. >Maybe IR is following suit? >Art > You mean going out of business like Signetics? John
From: Artemus on 19 Mar 2010 20:05 "John Larkin" <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote in message news:mjv7q5172knlvhncd557ig7e0tc8a1ht54(a)4ax.com... > On Fri, 19 Mar 2010 15:37:26 -0800, "Artemus" <bogus(a)invalid.org> > wrote: > > > > >"John Larkin" <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote in message > >news:cpb5q5p2013r34ainnmcrdfjml4ifvp03g(a)4ax.com... > >> Just got a short-form IR mosfet thing in the mail. > >> > >> They have a PQFN 5x6 mm package they rate at 104 amps. And a D2PAK > >> rated for 340 amps. > >> > >> John > >> > >Anybody here remember the Signetics WOM? > >As I recall it was intro'd back in 1972 about this time of year. > >Maybe IR is following suit? > >Art > > > > You mean going out of business like Signetics? > > John > Nope. Intro'ing a product like the WOM. Art
From: Tim Williams on 19 Mar 2010 19:30
"John Larkin" <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote in message news:rdg7q5tq6poofchebou0qed810smicbf9d(a)4ax.com... > The IR testing context isn't 100% clear to me, but using boiling > liquid may be the way they get the DPAK source lead to not melt at > their specified currents. Ditto not melting their solder joints to a > pc board. PC board?? Tack 24AWG wires onto it and sink the whole thing into the refrigerant. PC boards are excellent insulators in comparison. Tim -- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms |