UL approbation
Hi,
We use the LNK304 for our design. We based our design on your RDR-138 Application Note. Actually, we have some problems with the UL approbation for our PCBA. The C1 and C2 4.7uF/400V electrolytic capacitors are the problem. It seems that UL agents want to force us to use UL approved capacitors. We already saw your note in the forum about it (https://www.power.com/forum/low-power-design/do-pi-parts-have-ul-csa-or-other-safety-agency-file-number/) and we have a SMT fuse before the capacitors (the single fault test should be OK regards the forum comments). So, do you have a technical ressource to help us to discuss with UL agent to use standard electrolytic capacitors?
Note that we are in preliminary approbation. We sent the schematic for evaluation.
Thank you
Vincent
回應
Hi,
I don't have UL recommended capacitors. The only UL approved capacitors are much more bigger and expensive than standard electrolytic LESR capacitors. We would like to use standard electrolytic capacitors. Is your other american customers must use UL approved capacitors also when using the LNK304?
Do you have some solutions to use the standard capacitors?
I don't havbe a known part number in this case.
if you have UL recommended capactors, then you can replace C1 C2 with those certified caps. as far as you use capacitors with same values and ratings as shown in your current design, the performance will be the same.