> If the FET is not fully on, then its DC resistance will be greater, leading > to far greater thermal losses, i.e. it'll get hotter... In an SMPS, its vital > that the switching device is either fully on or fully off, and not ever > somewhere in its linear region
I was thinking along those lines too - perhaps some flux residue provides a little bit of leakage. Since the FET is high impedance on its gate, a little leakage could turn it partially on, leading to heat. I haven't looked at the schematic either, but if the driver circuit doesn't turn the FET off solidly, this could happen. - John -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/31C4372B-AFAE-4ACE-9DED-D77296056723%40mac.com. For more options, visit https://groups.google.com/d/optout.
