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Registered Member #977
Joined: Thu Aug 30 2007, 06:57PM
Location: England
Posts: 74
Ah ok thanks, I see now. Does the voltage rating have to be as high as the mur1560's? Or could I get away with about 200 volts. I have a nice big variac so that'l make the voltage adjustment simple.
Registered Member #977
Joined: Thu Aug 30 2007, 06:57PM
Location: England
Posts: 74
Just wired this up, worked really well then one mosfet went pop. Looking at it all afterwards the heatsinks were very warm, and the oscillator was only giving 3.2v to the GDT. I replaced the mosfet that blew and still no joy. Should the oscillator be providing more than 3.2v to the gates? I assume this would lower the source drain resistance, so also the likelihood of my irfp260s blowing up.
Registered Member #977
Joined: Thu Aug 30 2007, 06:57PM
Location: England
Posts: 74
Upon closer inspection only one of the drivers is getting hot, and i gets very hot! Could this be because the internal resistances of the components aren't matched so one is drawing more current? How could i get around this? And the voltage supplied differs with different GDT, to some it supplies 3.5v to others 7v, why is this and does this matter?
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TL494 flyback driver, walkthrough of design and construction
