Electronics > Projects, Designs, and Technical Stuff
DC-DC Converter Stability and performance help
FotatoPotato:
I have dealt with DOA and fake chips in the past but that was a long time ago, now I only buy from Digikey or Mouser. Nowhere else :-+
dfault:
Some general suggestions and thoughts:
* Label your schematic with your intentions. Should it be a 5V rail? What's the current limited to? How did you calculate a value?
* Consider prototyping a sub circuit before the whole thing. It seems like you may have done that
* Things tend to get hot when they oscillate. Also, it seems like you might be over driving the FB on on your schematic.
* you can solder less breadboard most converters with care. Pay extra attention to the current sense lines going to the regulator. These are very noise sensitive.
* What is the 3632 doing? What is the 3092 doing? Limiting current to the set pins?
* the diode on the 3081 is odd. As is the r13, r23, and r24 network. What is the goal?
* the lt 308x regulators don't always like capacitance on their set pins. Check the datasheet.
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