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Why use a custom wound inductor in offline LED driver input filter?

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T

treez

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Newbie level 1
In the ti.com application schematic of a 9W offline LED driver, they use an input filter inductor (L2) which is 4.7mH.

Schematic showing L2:
**broken link removed**

BOM showing L2:
**broken link removed**

Why haven't they just used an off-the-shelf, 4.7mH inductor here? Its much cheaper?
 

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