I have spent probably around 8 hours working on this today, and I cannot make any progress.
I'm trying to use the TI MC33063A in a boost converter circuit, just to make a proof of concept. Right now I'm using a 9-volt battery and I'd just like to see any voltage boost.
I have followed the sample circuit layout on page 6 as closely as I can, but the voltage coming out is at most 8.75 volts. The only noteworthy differences are that I'm using a 22mH inductor, since it's the closest I have, and that my voltage divider is a 10 to 1 ratio, which is different from theirs. I'm using a 100k ohm and 10k ohm voltage divider. I have spent hours looking for differences and I see none, at all. My circuit does not produce any voltage boost at all, and my calculations show that it should be generating at least 13 volts.
A voltmeter shows that the voltage divider circuit is -- expectedly -- about a tenth of the V_out at all times, which means the comparator should be outputting a constant value. The #2 pin seems to be draining about 85% of the power that is sourced from the 9 volt battery, based on mA measurements I took.
Earlier, I doubled up on 9 volt batteries and pumped about 18 volts through the system. If I left the circuit ungrounded and just connected it to the positive lead on the series batteries, I actually did see 21 to 24 volts come out the output, but grounding the circuit quickly negated any transient voltage spikes.
Does anyone have any suggestions of what I could be doing wrong? After a full day of trying and failing to cause a voltage boost, and I spent some time trying with a Maxim IC as well, it's starting to seem like voltage boost converters can't possibly work at all... very frustrating.