Thankyou for all these replies.
I had noticed a few axial diodes, but so few that i worried they may go future nil-stock.
I think you hit it when you said "PTH in an SMD world"
Interesting what you say about 100mA being too much for LNK302.....thing is , ipk is 165mA, so as long as the L is big enough, i should be able to squeeze 100mA out of it....my vout, at 5V, is so low, that the L doesnt discharge down quickly....but youre correct, the top of the datasheet says its "63mA max".......i have a qu on Power website forum about it but no reply as yet.
-Because its odd that in no single power integrations App Note, is there any mention of doing a 5V supply with any of their HV Bucks. And yet, 5v is a pretty standard vout.
But you have a point because to get 100mA out of a LNK302 you do need an L which is higher than the recomended 1.5mH.....and maybe they are thinking there will be issues with inter-winding capacitance or something?
Also,
It seems a bit odd that D2 on page 4 of the LNK302 datasheet is just a slow 1N4005.....but maybe they think it will have zero current in it by the time the cap C3 snaps back up to 300V or whatever is Vin.