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LM5166: Input Overshoot

Part Number: LM5166

Hi team,

My customer is evaluating LM5166Y.

Please check schematic/waveform from this TI internal link.

When input is switched from 12VDC source to 24V_ACDC by switch and diode OR, Vin pin goes up up to 32V whereas output of ACDC is 24V.

I doubted effect of inrush current to input capacitor first, but output of ACDC is pretty stable while Vin shows overshoot.

Do you have any idea what is cause of this phenomena?

Best regards,

Shota Mago