about the PMG1-S3 power supply for Vsys/Vbus_c_p0/Vbus_c_p1

[NoAr_1540581]

Hello

I am referring to the PMG1-S3 datasheet 002-31288 Rev. *G, and Figure 10 PMG1-S3 power system block diagram shows three types of power supply for PMG1-S3 (Vsys/Vbus_c_p0/Vbus_c_p1).

Q)

What are the priorities in each case for these power supplies below?

CASE1: If Vsys/Vbus_c_p0/Vbus_c_p1 are all valid, is it correct to assume that Vsys has priority?
CASE2: When Vsys is absent and both Vbus_c_p0/Vbus_c_p1 are valid, what is the condition for determining priority?
　　　ex1) Will the one with the higher voltage have priority?
　　　ex2) how to determine the priority when Vbus_c_p0 and Vbus_c_p1 have the same voltage?

Best Regards

Arai

[Pranava_YN · Accepted solution]

Hi Arai-san,

Case 1 is correct, Vsys has higher priority over Vbus supplies.

In the Absence of Vsys, Vbus supply is used. There is no priority between Vbus_p0 and Vbus_p1. The one which is present first will be used by the internal LDO to generate VDDD.

[NoAr_1540581]

Hello Pranava san

Thank you for your response. For more information, is there an efficient voltage for the internal regulator?

For example, when comparing 20V and 5V

Best Regards

Arai