A Quick Look at the Perigears 45W USB-C PD Wall Charger's Support of USB Power Delivery

The Perigears 45W USB-C PD Wall Charger supports 15 watts (5 volts @ 3 amps), 27 watts (9 volts @ 3 amps), 45 watts (15 volts @ 3 amps), and 45 watts (20 volts @ 2.25 amps).

We used the USB Power Test App from Granite River Labs with the Granite River Labs USB Power Delivery Compliance C2 Tester to generate the following test results for the Perigears 45W USB-C PD Wall Charger.

The USB Power Test App first negotiates a power contract for every PDO supported by the Perigears charger, and increases the load gradually to find the threshold where over current protection (OCP) kicks in and voltage and current start to drop for safety reasons.

The USB Power Test App reports out all the PDO's supported by the Perigears charger and their OCP thresholds. OCP thresholds for the charger are set at about 6-10% above the maximum current levels for the fixed PDO's.

PDO	OCP (A)
PDO#1 Fixed: 5V 3A	3.3
PDO#2 Fixed: 9V 3A	3.26
PDO#3 Fixed: 15V 3A	3.26
PDO#4 Fixed: 20V 2.25A	2.39

The USB Power Test App from Granite River Labs takes this data to produce an I-V curve which graphically shows the relationship between voltage and current for each PDO. We can observe as the current increases beyond the OCP threshold, the voltage immediately shuts off.

The USB Power Test App can also use the Granite River Labs USB Power Delivery Compliance C2 Tester integrated with the GW Instek APS-7100 programmable AC power supply to compare the charger's power output vs power input so that power efficiency can be measured and compared to regulatory limits from United States of Energy (DOE) Level VI or European Union's CoC Tier 2 requirements. We can repeat the power efficiency tests for different PDO's, current load conditions, and different AC input ranges, allowing us to get a complete picture of power efficiency ranges across all different usage scenarios.

Using the USB Power Delivery Compliance C2 Tester from Granite River Labs to run just a subset of the full USB Power Delivery compliance test suite, some compliance failures which included the eye diagram were observed for the Perigears 45W USB-C PD Wall Charger.

Result Summary

Sl No	Test ID	Test Name	Test Result
1	TDA.2.1.1.1	BMC-PHY-TX-EYE	FAIL
2	TDA.2.1.1.2	BMC-PHY-TX-BIT	PASS
3	TDA.2.1.2.2	BMC-PHY-RX-INT-REJ	PASS
4	TDA.2.1.2.1	BMC-PHY-RX-BUSIDL	PASS
5	TDA.2.1.3.1	BMC-PHY-TERM	PASS
7	TDA.2.2.1	BMC-PROT-SEQ-GETCAPS	PASS
11	TDA.2.2.7	BMC-PROT-BIST-NOT-5V-SRC	PASS
13	TDA.2.3.1.1	POW-SRC-LOAD-P-PC	PASS
14	TDA.2.3.2.1	POW-SRC-TRANS-P-PC	PASS
15	TDB.2.2.9	BMC-PROT-GSC-REC	PASS

BMC Eye Diagram

We further verify using the GRL-USB-PD C2 Compliance Test Solution App to generate a load diagram which shows that the Perigears 45W USB-C PD Wall Charger is able to support charging at different voltages and current levels.