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86.8 Power Efficiency Percentage (3.3-5.9V 3A)
86.2 Power Efficiency Percentage (5V 3A)
3.78A OCP Threshold (3.3-11V)
3.38A OCP Threshold (5V)
3.13A OCP Threshold (9V)
3.1A OCP Threshold (3.3-5.9V)
88.3 Power Efficiency Percentage (9V 2.77A)
87.8 Power Efficiency Percentage (3.3-11V 2.75A)
63.3 deg C Max Temp (9V)
15W (5V@3A) Out
24.9W (9V@2.77A) Out
PD 3.0 PPS
USB PD 3.0
Cable Assemblies & Connectors, USB
Source, USB PD
How the Samsung 25W PD 3.0 PPS Type-C Charger Supports USB Power Delivery
The 25W charger that shipped with the Samsung Galaxy S10 5G phone is Samsung's first USB Type-C based charger for its Galaxy series. The Samsung 25W PD 3.0 PPS Type-C Charger supports USB Power Delivery 3.0 based PPS (Programmable Power Supply) and Augmented PDO's for rapid charging over the Type-C interface. The charger offers up to 25 watts output using fixed PDO's (Power Delivery Objects) of 15 watts (5 volts @ 3 amps) and 24.9 watts (9 volts @ 2.77 amps) as well as variable power of 9.9-17.7 watts (3.3~5.9 volts @ 3 amps) and 7.4-24.8 watts (3.3~11 volts @ 2.25 amps) power profiles.
The USB Power Test App first negotiates a power contract for every PDO supported by the Samsung 25W PD 3.0 PPS Type-C 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 then reports out the fixed PDO's supported by the Samsung charger and their OCP thresholds. Note OCP thresholds for the APDO's are either very low for PDO #3 or very high for PDO #4.
PDO#1 Fixed: 5V 3A
PDO#2 Fixed: 9V 2.77A
PDO#3 PPS: (3.3~5.9)V 3A
PDO#4 PPS: (3.3~11)V 2.75A
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. Like other chargers that support PPS (Programmable Power Supply), we can observe current fold-back behavior for all the PDO's except for PDO #4 where as the current increases beyond the OCP threshold, the voltage starts to curve down rather than immediately shutting off. The current for PDO #4 just drops without reaching the 3.78A OCP threshold.
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 Test App and FLIR thermal imaging tools, we measured the heat emitted by the Samsung charger as seen in the following temperature graph for the highest 9V, 2.77A fixed PDO, which recorded max temperature of around 63.3 degree Celsius.