I'm looking at this charger:
https://www.amazon.com/Belkin-USB-C...0F6593JJ1/ref=sw_img_d_pd_sw_d_sw_dealz_dfy_2 (fourth picture down)
It claims to be PD 3.1 certified. Does anyone know what that means? I could sell Lemonade and call it certified but that doesn't mean a thing. You hear "Certified" and you think it must be good.

 

Hello,

Read the following article:
https://www.allaboutcircuits.com/in...d-vs-usb-c-differences-benefits-and-adapters/

Bertus

 

So PD 3.1 isn't just a 5V charger it can charge devices of differing voltages as well. Interesting. Thank you.

 

USB-C PD chargers/ power supplies negotiate with a connected device to deliver higher voltages to increase the wattage that can be delivered. The charger will deliver only the standard 5 volts unless negotiated otherwise*.

The tables below show how a device can draw up to 240 watts instead the the customary 5 or 10 watts.

*Some devices, like microcontroller modules and consumer products wanting only 5 volts have quickly slapped on a USB-C connector without following the PD specification. They leave out two crucial resistors – when connected to a PD supply using a USB-C – USB-C cable, no voltage will be supplied. Using a USB-C – USB-A cable to a non-PD charger will allow them to work.

The Amazon listing is deficient because it does not show the voltages/currents available. For a multi-port charger, this information is critical. Many laptops require a 60 watt PD supply – 20 volts at 3 amps. A multi-port charger may claim to be a 65 watt supply, but that's a TOTAL of 65 watts across all the ports. A single port might be limited to 15 volts at 3 amps, so it won't support powering a laptop needing 60 watts.

 

Hello,

This is stated at the section additional details:
Input Voltage: 100-240V ~ 50/60Hz 0.65A
USB-C output: (PDO) 5V/3A, 9V/2.77A , (PPS) 5-11V/2.25A (25W max)

Bertus

 

Oops, missed that detail. But it really should be front and center.


I haven't seen many supplies with the PPS feature. That could be very interesting if you can bend it to your will.