[Samsung Galaxy Tab S8] drjoe1:
I think I found the definitive article that ties all the above discussion together

Don't just buy any 45W+ PD charger for your Samsung Galaxy Note10+

You likely won't be getting the full 45W charging speed and here's why. Samsung's new Galaxy Note10+ is exciting for more than a few reasons as our...

www.gsmarena.com

Awesome article. Discusses the Samsung format and compares it to PD 3.0:

What Samsung really is asking for 10V which is non-standard for PD 3.0. But PPS "Programable Power Supply" functionality lets the power supply adjust to 10V. But at 10V the power supply is limited to 3A, so you get 30W. Here is how gsmarena explains it:

"However, a client can also try to request a non-standard voltage - in the case of Galaxy Note10+ that's 10V. The charger generally has no obligation to provide said voltage so it will normally provide the nearest lower voltage it can. So, when the Note10+ requests 10V at 4.5A from a charger that is incapable of providing that, it would start giving out 9V@3A.

What happens (with PPS) is that the Note10+ asks the power supply for 10V, just like before. But instead of turning down the request and cautiously falling back to 9V, a PPS-enabled charger is fine and starts pumping out the 10V Samsung needs.

So, to sum up, the Note10+ needs a PD3.0 charger, with PPS support, rated at at least 45W. However, that's still not the entire story. 3A is sort of a standard and most current chargers have each of their voltage outputs top out at 3A. However, the PD standard does allow up to 5A. In order for that to happen, the charger must be designed accordingly to be safe at such currents and certified as such.

Meaning that even the third party bricks we managed to find with definitive info on PD3.0 and PPS support still lacked the ability to go beyond 3A at 10V.

We're not saying that no PD3.0, PPS chargers with 4.5A@10V output capacity exist out there. But even if they do, there is a huge shortage on dependable info and for the time being the official Samsung 45W charger is the safe way to go."

In the reviews on Amazon, it says this is the specs for the Samsung charger:

(PDO) 5.0V=3.0A or 9.0V=3.0A or 15.0V=3.0A or 20.0V=2.25A.

(PPS) 3.3-11.0V=4.5A* or 3.3-16.0V=2.8A or 3.3-21.0V=2.1A

*The reviewer says that the documentation says 4.05V, but that it is a typo. He also pointed me to the gsmarena link -- see Q/A David on February 4, 2020 off https://www.amazon.com/Samsung-USB-C-Super-Charging-Charger/dp/B07VHDSNNT

I can't find PPS specs for either of my PD 3.0 bricks.

So again, I'm going to sum up....

1) Samsung requires PD 3.0 + PPS with 10V @ 4.5A to get full 45W power

2) Most PD Bricks will either (A) Supply 9V @ 3A or (B) With PPS Support Supply 10V @ 3A

--> The only known supply for 4.5A @ 10V is the Samsung 45W charger

--> edit #1: VELOGK has several car-lighter chargers on Amazon that claim 10V @ 4.5A

--> edit #2: Elecjet PowerPie P20 is a 20,000 mAH Power Bank they claim supports PPS 10V @ 4A -- They claim it is 45W, but pictures of the supply show 10V @ 4.0A

3) You still need the emark cable

(the gsmarena article also has a nice description of how emark chipped cables work)

Now I feel better knowing what is going on.