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TPS54260: Vin should keep stable when test Load Transient?

Part Number: TPS54260

Our Schematic as below:

When I test Load Transient,result is bad:

After I remove L2,result is ok:

Vin is varing when with L2,so I want to know

1. If Vin must keep stable when test Load Transient?

2. And how can I deal with Vin surge protection and Load Transient?

Thanks!