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Help with choosing diode for boost converter

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jonroger:
To select parts for a DC-DC converter, I highly recommend that you use TI's WEBENCH - even if you aren't using one of their controllers.

fabiodl:

--- Quote from: uer166 on May 23, 2020, 10:19:21 pm ---
--- Quote from: fabiodl on May 23, 2020, 03:18:52 pm ---I probe it with normal x10 oscilloscope probes

--- End quote ---

There's the problem most likely, try using one of these:

--- End quote ---
Thank you, I will try to improve the measurement setup. Is there a commercial name or did you make it yourself?
However, it does not seem to be only a measurement error. As I reported in #5, the spikes are actually destroying ICs on the board (when not measuring).

fabiodl:

--- Quote from: trobbins on May 24, 2020, 12:00:00 am ---The link to the new part is to a 22uF cap, and you indicate the original part used was a 10uF cap.  Were there no 10uF caps available on digikey, or did you you think that 22uF would be better and have no consequences?

--- End quote ---

The datasheet for the mt3608 reports 22uF as a suggested value, so my guess was the module used 10uF just because they were cheaper. Indeed, 22uF with the original diode works reasonably well, and with open load, 22uF caps provide a reduction in the ripple over the 10uF caps.

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