Listen to this:
https://www.youtube.com/watch?v=nBtOEmUqASQ&t=343s
And that relates to PDO. So the Raspberry Pi 5 will communicate with your PDO power adapter, as the Samsung 45W mentioned above is. So if the PDO say it cant deliver 5A it just run the Raspberry Pi 5 in "Low Power Mode".
PDO stands for Programmable Power Object. It's another technology that's often used in conjunction with PPS. PDO allows the charger to communicate with the device and negotiate the optimal voltage and current output based on the device's specific requirements.