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I'm fairly new to electronics, and in my project I'm using LM22673 as Buck Converter in this Diode selection parts this is given which is confusing for me.

as

  1. Ultra-fast diodes can switch very fast, so what's the issue with that? How it will damage the IC?

  2. Also, why choose a diode with reverse breakdown rating of max Vin. It's on Output side right, so why does it matter?

toolic
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navi
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    The diode is "inside" (on the switching node), the output is "after" the inductor – Mat Jul 14 '22 at 06:15

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Reverse recovery

There are several good posts on this forum that describe this phenomenon. What is the reverse recovery time in a diode?. What they are stating in the datasheet is that the Schottky diode has even better reverse recovery characterstics than an ultra fast one.

Reverse breakdown voltage

The output voltage of an ideal buck converter is between 0V and Vin. Therefore the highest possible voltage the diode can experience is Vin. However, considering tolerances, voltage ripple/spikes etc it is a good idea to add some safety margin.

LukasL
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