I am in the process of upgrading some older circuits with newer components. One of which components is a 150uH iron core inductor. For reference, this is the part at DigiKey:
The circuit that this inductor is in is a UV Lamp drive circuit that is powered by a LT1172 100kHz constant current driver. According to DigiKey, the resonant frequency of the inductor in the circuit is 3.2MHz, with a maximum current draw of 1.15A.
I imagine the resonant frequency is quite important, but can i use an inductor with a different harmonic perhaps?
Also, the quality rating DigiKey lists 20 @ 796kHz, could i choose an inductor with a lower quality rating because the circuit is running at a much lower frequency?
The DC Resistance is listed as 370mΩ max. I'm assuming that as direct replacement the DC Resistance is pretty important.
Is it important that the replacement inductor has the same core material? Will a ferrite core inductor suffice in place of an iron core?
I'm guessing that a lot of these properties are somewhat application specific. It doesn't seem like there are a ton of inductors on DigiKey that have the same set of properties.
What properties do i have some wiggle room on? I suppose the 150uH is pretty set in stone, and anything with the same current rating or above; other than that I'm in uncharted territory.