Mike DonnellyDesigner19 × Mike Donnelly Member for 8 years 6 months 1,221 designs 5 groups Original member of the PartQuest Explore development team. Modeling and Applications Specialist Vote up! Vote down! Points +59 340 views total 248 views today Title Description <p>This design shows the importance of choosing the right inductor size and type, to avoid saturation-induced current spikes during operating transients. In this case, the start-up transient in two nearly identical open-loop buck power stages (12V -> 3V) is examined. The only difference is that the top circuit is using an inductor calibrated to a Coilcraft XAL6060-223 (22uH), which has "soft saturation" behavior. The bottom circuit is using a similarly sized inductor, but with a more typical "hard saturation" characteristic.</p><p>Both inductors work well for the steady-state load condition of 3 Amp. But during the turn-on transient, that current can go significantly above that nominal level. At that time, the instantaneous inductance of the hard-saturating device collapses, resulting in even larger current spikes in each switching interval. Note in the waveforms on the left: The soft-saturation inductance drops to 14uH minimum during the transient, whereas the hard-saturation inductance crashes to near 2uH, or only 10% of its nominal value!</p> About text formats Tags Buck Power Stageinductance collapseCoilcraftXAL6060-223 Select a tag from the list or create your own.Drag to re-order taxonomy terms. License - None - What's this? Please login or register to post comments You must be a registered user to add a comment. Design Titleby Mike Donnelly × Embed Design Copy Embed Code <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/embed-design/25736"></iframe> Embed Live Design Copy Embed Code <iframe allowfullscreen="true" referrerpolicy="origin-when-cross-origin" frameborder="0" width="100%" height="720" scrolling="no" src="https://explore.partquest.com/node/25736"></iframe> Share a Link Copy URL https://explore.partquest.com/node/25736
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