TPS23754: VDD pin of TPS23754

Feng bin Su

Part Number: TPS23754

Hi team,

My customer saw some design that Pin:11, Pin:12 Vdd and Vdd1 are bypassed to PGND instead of VSS.

Which ground plane is more suitable for VDD pin from IC level perspective? PGND or VSS or either one?

Thank for your help.

0 Brett Colteaux over 4 years ago

Hi,

Thank you for your question.

On a high level, VDD is used to provide power to the PoE PD whereas VDD1 is used to provide power to the PWM controller.

For the VSS plane and PGND plane layout, we go over this in detail in the app note here: https://www.ti.com/lit/an/slua469/slua469.pdf

I recommend you take a look at Figure 1-3 and Figure 1-4 and let me know if you have any more questions about this.

Thank you.

Best Regards,

Brett Colteaux

Power management forum