shielded inductor -> low frequency?

Michael · 2007-09-20T18:42:50+00:00

Greetings gents of the SED variety - I have a couple quick questionsfor you all: I am working on a DC/DC switcher that will use the Linear LT1930A. Itswitches at 2.2MHz. I need to find a ~8-10uH inductor that can handleabout .5-1A for this. I identified the Sumida CR43 series as a goodcandidate. For example, there is a 8.2uH (at 7.96MHz) CR43 series with166.2mohms DCR speced at 0.84A. It also has a very small 4.3x4.8mmfootprint. It would be perfect, except that it isn't shielded. I wouldreally prefer it to be shielded. I started looking at other Sumidainductors, and it seems that all the shielded ones are speced in thelow KHz region. Am I missing something here?Also, what is the relationship between inductance and frequency? Igoogled around about that for a bit but couldn't find anything.Thanks,-Michael

Sep 20, 2007 20 Replies

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Tony Williams 18 years ago

I had to read the text few times before the penny dropped.

Tony Williams.

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shielded inductor -> low frequency?

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