Other than the actual inductance, what are other important characteristics for an inductor used in a dc-dc converter? For example, the windings, the core material, etc.
Perhaps some detailed App Notes that describe these characteristics and how important each variable is in different circuit configurations.
Hello Len,
Other than the actual inductance, here are some other important characteristics that I take into consideration when choosing one for my application:
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DCR - This is the DC resistance of an inductor. Typically, smaller inductors will have a higher DCR whereas bigger inductors will typically have a smaller DCR. Of course, depending on the materials and winding methods (length and gauge of the wire used), you can find smaller inductors that can have a smaller DCR than bigger form factors (but this will likely reflect in cost). A smaller DCR will yield the best efficiency for your system.
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Shielding - There are several types of inductors. MPS sells molded and semi-shielded inductors. Shielding overall can minimize EMI.
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Saturation Current - This is the maximum DC current can flow through an inductor before it’s inductance derates. As a standard, this current is characterized when the inductance derates to 30% of the nominal value. It is best to choose an inductor where the nominal current in application has sufficient headroom from the saturation current.
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Temperature Thresholds - This is a good figure to pay attention to in any datasheet. Pay attention to at what temperature the inductor will start to derate relative to the target application.
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We also have the following articles that are all worth a read:
- Understanding Power Inductor Parameters | MPS
- How to Avoid Inductor Saturation in your Power Supply Design | MPS
- Surface Mounted Inductors Optimized for MPS ICs | MPS
Hope this provided some insight. Feel free to use our Inductor Selector Tool with all these parameters in mind to make the best choice here.
Best,
Krishan
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Great! Thank you! I’ll review all of those.
No problem, Len-Ellis, happy to help. If there are no further questions this post will close in 3 days.
Best,
Krishan
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