Nixie
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- Feb 22, 2005
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I asked someone for how to make a regulator for a power amp supply (Aleph-X, balanced single ended), and he sent me a generic schematic, as well as a description which I reproduce below. Besides that the MOSFET is on backwards, I can't figure out what values to use to get this to work in the simulator. I'm unable to contact that person anymore, so I'm looking for help here.
Quote:
Quote:
Originally Posted by hifizen My first recommendation is to stick with a relative reference voltage, rather than absolute. Add some low Rds(on) MOSFETs as the pass elements instead of BJTs, and you'll be able to minimize the forward losses without too much concern that a sagging line voltage will cause dropout. Build a feedback loop with a bipolar diff pair, some Rs and Cs, and presto, you have a nice little regulator. See attached schematic. This version will give you an output which remains 0.65V-0.7V below the average input value at all times. This assumes that input ripple is already fairly low - you'll need to simulate this to make sure there isn't any dropout under worst-case conditions. |