On Monday, November 25, 2013 1:15:31 PM UTC-8, Michel wrote: > > > Is that FET not warming up too much when you drive it directly from the > AVR output? >
The FET doesn't warm up at all. The only reason it would warm up is slow turn-off time - the turn-on time is already limited by the inductor - and the AVR has plenty of drive, it can sink more than 40mA in brief pulses. Since the FET only sees half the output peak there's much less Miller effect, and careful layout also helps reduce feedback capacitance. I've actually had this circuit running with an SOT-23 FET, generating 50V at 100mA for VFDs. > -- 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/689e6101-336c-47da-bb64-c0eabbd72635%40googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
