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TPS61178: some questions of TPS611781 and request of review schematics

Part Number: TPS61178

Hi.

My customer is using to TPS611781RNWR.

he designed the circuit by referring to webench.

https://webench.ti.com/power-designer/switching-regulator/customize/4?noparams=0

However, some issues were discovered during testing.

Input : 3V-4.2V

output : 5.7V at 5A

when Ccomp is 1nF at no load,  output current was increased up to 400mA. and Inductor humming noise occurs.

I have some questions

1. I would like to know the detailed use of the Ccomp pin.

2. when this device using, how to decrease inductor humming noise.

3. Is there a way to use the TPS611781 product without connecting an external clock to the FREQ/SYNC pin?

Finally,

please review the schematic.

thanks,

regards,

robin.