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Registered Member #514
Joined: Sun Feb 11 2007, 12:27AM
Location: Somewhere in Pirkanmaa, Finland
Posts: 295
Bacon wrote ...
Excuse my stupidity but what is RTFDS?
I believe it's a variation of RTFM.
Bacon wrote ...
Yes I know the max working voltage is 15. I stuck a 5V reg in for the ucc and the 555. the coil was powered on 32V
If you supply the UCCs with only 5V the voltage you are driving your FETs with will also be only 5V. This way they are in their linear region, causing massive dissipation in the FETs and killing them (unless they are "logic-level" FETs, that are fully turned on at around 5V).
Bacon wrote ...
Do any of you guys know how to make a indestructible FET driver like the ucc?
There are drivers made from discrete components floating around the net. These are pretty indestructible and powerfull, but serious overkill for this job. Besides, UCCs are pretty much bomb-proof, as long as you give them the right supply voltage, use generous amounts of decoupling and make sure your GDT is working properly (not saturating, proper material, DC-blocking etc).
Registered Member #588
Joined: Sat Mar 17 2007, 11:06AM
Location: UK
Posts: 93
Well the FET was fine, it was the ucc that decided to blow its top (literally) This time I did not overvolt it and it still died, it was only connected to a small BUK455 FET, this was my attempt at this circuit. The reason I did not power it on 12V is because when I did the oscillation stopped and the ucc got HOT.
I am going to try to build (and fail) an about 10 amp ucc equivalent...
for the GDT I used a ring of unknown material pulled out of a computer PSU.
I look like a real idiot saying what does RTFM mean. Jumping to concludtions by any chance?
Registered Member #588
Joined: Sat Mar 17 2007, 11:06AM
Location: UK
Posts: 93
... wrote ...
You didn't use the yellow powdered iron core out of the supply, did you?
Yep it is a yellow one. Why is it bad to use them?
Ugh, now I have got to buy one,
Screw that, I am going try to make this one, 5" sparks! Thats WAY enough to satisfy me. I would be over the moon if that works (I highly doubt that though) What is the value of the tank cap (C6) across the FET and YES I HAVE RTFM!
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Why is it bad to use them?
Because of way too low permeability and massive magnetizing current which blows the UCC's. I't's material #26 powdered iron, you need ferrite, 77 or similar.
Also check if you didn't blow the regulator and it feeds full supply voltage to UCC. Be careful around those things..
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
BTW, it stands for Read The F***ing Data Sheet
The only times I have ever blown UCCs, were when the regulator failed and hit them with 30V, or if the magnetizing current (that Marko mentioned) got too high and made them latch up.
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Steve's Mini SSTC, again.
