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TPS65983B: configuring for unconstrained power.

Part Number: TPS65983B

Hi, we are using a tps65983b in a single port Thunderbolt design.

Our device is mains-powered device, and support power supply over type C of 5V 3A.

My question is , in which case the <External Supply is Unconstrained >setting should be checked?

This is in thee "Tx Source Capabilities Extended Data Block"  tab in the  "Source Inputs" section.

The other two settings seem clear in my case:

External Supply Present - Yes

Internal Battery Present - No.

Thanks!