When selecting a catch diode for a non-synchronous buck converter, is there way (or even a general rule-of-thumb) to determine a safe current rating? Most diode spec sheets will show the max average current (based mainly on thermal capabilities) and usually a non-repetitive peak current, often 10-50 times higher than the average. But in a switching converter it will be repetitive, and I have very rarely seen this specified.
If for example I expect 800mA output from a regulator, and I expect up to 1.6A peak current through the diode, can I select a diode with a 1A (max. average current) rating? What is safe to assume about the max peak capability? Of course a 2A diode would be safest, but is it necessary?