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DC-DC converter in mixed signal application

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David Hess:

--- Quote from: floobydust on June 19, 2019, 09:21:51 pm ---For DC-DC output differential-mode noise going into the LDO, something like a 10uH inductor works, up to 10's MHz which is enough. I find ferrite beads alone don't attenuate enough in the low MHz.
--- End quote ---

They make special "broadband" ferrite beads which have extended low frequency performance while keeping a high self resonate frequency.

One thing to watch out for when using ferrite beads is not to drive them into saturation with excessive DC current.

ZeroResistance:

--- Quote from: floobydust on June 19, 2019, 09:21:51 pm ---
Monitoring mains voltages using an optoisolator and DC-DC for power does have drama.


--- End quote ---

I have low voltage 12VDC going into the DC-DC converter. What exactly does monitoring the input do?

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