> I suppose that I only read about the bad experiences, but I always can't > help wondering to myself exactly why anybody messes with these chips at all.
Because, once everything is quieted down (stabilized), its the most efficient of all the switchers usually used here. Even the MC34063 has stability issues, which I clean up in my circuit. A system with feedback becomes unstable, if the loop phase hits 360 degrees before the loop gain drops below 1. There are two basic ways to fix it. One is to thoroughly model the system, then add reactive components to the network, to adjust the phase and gain to avoid the above situation. The other is to swamp it, so that loop gain is guaranteed to be below 1, by the time the phase shifts too much. I'm lazy, so guess which method I use. Lazy method can't always be applied. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
