Re: SSTC problem - not plasmasonic :-))

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Dan" <pbursa-at-cfl.rr-dot-com> 

Jim, check the schematics, microSSTC is a bit different from miniSSTC   LOL
TC4420 doesn't have enable function and have only 6A peak drive current
while UCC37322 can push over 9A peak. For the Steve's Ward mini SSTC you
need enable pin as it is completely different design from microSSTC.
Kreso, check datasheet and compare to your setup... There must be something
wrong ... don't you have the chip backwards ? How about proper antistatic
handling techniques ? These chips are quite foolproof, I never had problems
with them...
Vladan

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Sunday, April 11, 2004 10:51 AM
Subject: Re: SSTC problem - not plasmasonic :-))


 > Original poster: "Jim Mitchell" <electrontube-at-sbcglobal-dot-net>
 >
 > LOL kreso you stole my joke about the plasma sonic :-)
 >
 > Anyway,  I had trouble with the UCC37322 when I tried to make the
microsstc
 > so long ago,  try using the TC4420,  also tie pin 3 to VDD through a .1uf
 > cap that might help.
 >
 > Regards - Jim Mitchell
 > ----- Original Message -----
 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > To: <tesla-at-pupman-dot-com>
 > Sent: Saturday, April 10, 2004 7:43 PM
 > Subject: SSTC problem - not plasmasonic :-))
 >
 >
 >  > Original poster: Kreso Bukvic <kreso.bukvic-at-kc.htnet.hr>
 >  >
 >  > I have started building Steve Wards mini SSTC  ! Terry and John gave
the
 >  > parts. I made evrything until mosfet driver IC-s ( UCC37322/1's ) And
 > tried
 >  > to connect the power to see if the chips heat or somthing and UCC IC
 > popped
 >  > on one small hole puncturedon pin 4 ! I checked ALL wiring evrything
was
 > ok.
 >  > Again popped the chips. Now i toke a completly new IC and soldered only
 > the
 >  > power supply to it ( 12 V ) I used my handy, expensive, professional
bench
 >  > SPU ( obviously the problem was not here ) and soldered 4 wires (- to
pin
 >  > 4,5) (+ to pin 1,8) ana a capacitor 0.1 uF across the + and -. I tried
 >  > disconnecting the capacitor too but id didnot help a soon i connected
the
 >  > psu the IC acts as short circuit. Maximall current draw was set to 1 A
i
 >  > tried setting it to 100 mA so i do not burn the other IC-s but no help.
 >  >
 >  > Here is the setup until now. But any way the chips pop even without any
 >  > other wires connected except PSU.
 >  >
 >  > http://hot-streamer-dot-com/temp/miniSSTCsch3.jpg
 >  >
 >  > I hope Stewe wont mind me changing his shematics. Sory Steve
 >  >
 >  > Best Regards
 >  >
 >  > Kreso Bukvic
 >  >
 >  >
 >
 >