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LMR51450: Strange Efficiency Behavior on WEBENCH

Part Number: LMR51450

Hello team,

My customer is experiencing a strange behaivior on WEBENCH.

The effiiciency changes more than 3% between VIN of 23.9V and 24V.

The setup condition is 24Vin => 14.5Vout / 4A out with LMR51450FN.

Why does the efficiency change with just 0.1V difference of Vin? Is there some kind of threshold in the parameter for this simulation?

I have attached the WEBENCH report, so could you please take a look, and check if anything is wrong?

LMR51450FNDRRR_24Vto14.4V_4A.pdf

Best Regards,

Kei Kuwahara