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PMP21529: Back Up Supply mode Vbus

Part Number: PMP21529
Other Parts Discussed in Thread: UCD3138

Hi E2E,

Good day.

During the back-up supply mode of the PMP21529, I understand that the Vbat range is between 38-55V. However, the Vbus is known to be Vbus_nominal - 0.5V, how can we measure the Vbus_nominal? Or is there any configuration in the device that dictates the value of Vbus_nominal?

Thank you for your help.