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TPS55340: Currnet Problem in inductor

Part Number: TPS55340

Hi, guys

My customer have a problem using the product.
The current flowing to the inductor is a problem which leads to the negative field.
Flowing negative current means the same thing as the current is coming in from the load
I wonder if the diode is not doing its job, and why this is happening.
Please let me know how to resolve it as soon as possible..

Thank you so much