> The inductor is a Coilcraft MSD-1278-224 – this is a 220uH SEPIC choke with dual coils.
> In my application the coils are connected in series. The FET drain is connected
> to one end of the pair, the other end to the rectifier, and 12VDC comes in at the
> junction. With this arrangement the FET only sees half the peak voltage, so it
> has a good overload margin.
That is neat, I had not seen that before. Interesting!
> In my application the coils are connected in series. The FET drain is connected
> to one end of the pair, the other end to the rectifier, and 12VDC comes in at the
> junction. With this arrangement the FET only sees half the peak voltage, so it
> has a good overload margin.
That is neat, I had not seen that before. Interesting!
Is that FET not warming up too much when you drive it directly from the AVR output? In my clock I drive it from a 555 output but it get's quite warm, not too much I think because it runs like that for more than 6 months already. Using a gate driver chip with very low output resistance reduces the switching losses quite significantly. I use a TC4432 in another circuit, drive it from a PIC12F1840 output pin, since you already have a 12V supply, you then have a much larger choice for FET selection and can use a coil rather than transformer.
Michel
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 neonixie-l+unsubscr...@googlegroups.com.
To post to this group, send an email to neonixie-l@googlegroups.com.
To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/1363621091.76947.1385414131300.JavaMail.mail%40webmail13.
For more options, visit https://groups.google.com/groups/opt_out.
