Thanks, this is interesting....do you know what is the actual issue with this inductor, ie, why it isnt good for UL approval?
I take it its the winding insulation?
Having said that, ive seen plenty of SMPS that use filter inductors upstream of the bridge that dont have any reference to passing NRTL etc in their datasheet.
I did one offline 150W LED driver, of an unusual design, and it had to use only SMD everywhere....and i used SMD filter inductors, admittedly downstream of the bridge, and it passed 10kV transient test, thermals, EMC, everything. Those inductors made no ref to NRTL in their datasheet.
Ive always wondered just what it is about being "downstream of the diode bridge", that makes such a big difference to a components rating in an offline SMPS...(other than its DC there.).........what is this great protective cloak that the diode bridge throws over for us?
I admit the diode bridge could fuse and blow open and so provide safety.......but so could other components upstream of the diode bridge. If anything, i'm sure you agree, mains diode bridges are amazingly tough, and would be one of the last things to fuse open circuit.