Thanks, with our case, the trouble is often that we can only fit in the smallest inductor, with the lowest current rating, and they start saturating if the transient is more than a certain size.
Thanks, as you know, with power factor corrected buck or flyback LED drivers, there is little capacitance on the DC bus…..thus what happens during power-on-at-mains-peak is that the EMC filter L’s and C’s ring with each other, and cause the DC bus to go up to up to twice mains peak…..and if you don’t have a current clamp at the input, then that twice mains peak voltage can overvoltage your led driver IC if it has a 450v vcc pin (ours does).
Therefore, the current clamp is needed before even thinking about mains transients…..and then the current clamp can be used also for mains transient protection……so its worth spec’ing it for that because you have it there anyway