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LMR14050: Vout is dropped with 0.5A load

Part Number: LMR14050

Hi Experts,

My customer is evaluating with below schematics.

Vin  : 22Vdc

Vout : 5Vdc

Iout : 5A

As increasing electrical load from 0A, Vout starts to drop with 0.5A or larger load. At 0.56A load, Vout became 13.4V. Vin keeps 22V with this condition.

What is the root cause?

Regards,

Uchikoshi