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TPS23730: Need to suppress noise spikes from PoE switching

Part Number: TPS23730
Other Parts Discussed in Thread: TIDA-050045

We have implemented the TIDA-050045 reference design nearly as-is with minor changes.  We do have a slightly different inductor for L8.  Our design uses a 744325330 Wurth inductor which is 3.3UH 12A 5.9 mOHM.  We are getting larger than expected voltage spikes on the rising and falling edges at the switching frequency.  Can you provide some suggestions of what we can do to suppress these voltage spikes that are occurring?  I have included several o-scope captures.  The signals were captured using ac coupling on the probe.  The voltage spikes are taken on the output side of the L8 inductor and the switching frequency plot on the input side of L8.