Senoko PVT ECO List

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Revision as of 06:18, 1 July 2014 by Bunnie (talk | contribs) (Created page with "==ECO 1: Improve inductor clearance== The ferrite MSS1260 used as the primary power inductor is a bit too tall and large. Use a composite molded core XAL7030 which is a bit more ...")
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ECO 1: Improve inductor clearance

The ferrite MSS1260 used as the primary power inductor is a bit too tall and large. Use a composite molded core XAL7030 which is a bit more compact.

Pros/cons: XAL7030 has a better rated Irms than MSS1260, but seems mostly due to better heat conduction out of the package, not due to better electrical performance. The DCR of XAL7030 is 19.5mOhm, MSS1260 is 12.60mOhm, so conduction losses are greater. Isat of the XAL7030 is better due to soft-saturating characteristic of the composite core. Overall, I expect there to be very little change in practical circuit performance, perhaps a little extra heat during peak battery charging situations.

The MSS1260 isn't removed from the PCB layout. Instead, XAL7030 shall be fitted inside the footprint of the MSS1260. This allows for going back to the original inductor in case there is a design issue with the XAL7030.

This change is coordinated onto Novena BOM as well.

DVT PVT Notes
L200 3.3uH, MSS1260-332NL L200 3.3uH, MSS1260-332NL (DNP) remove from BOM but leave footprint
add L200B 3.3uH, XAL7030-332MEC add inductor within old footprint
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