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Old 08-08-2009, 10:09 PM   #9 (permalink)
NiHaoMike
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Join Date: Sep 2008
Location: Texas
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I'm currently working on a small DC/DC converter for my workstation. It converts 140-370v from rectified mains voltage to 13.8v at up to 1A for backup battery charging. I couldn't figure out why it was buzzing until I removed the load resistor and the buzzing slowed down to a clicking. Then I looked at the meter I had in series with my bench power supply and it was only using 5.3mW (33uA at 160v). I then realized that the converter was essentially P&Ging (which is known as "period skipping" in power supply design).

And no, I did not expect a simple 2 transistor DC/DC converter to "period skip"...
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