15W Fast Charger Specifications
1. Common Wired Output Profiles (Power Delivery / Quick Charge)
To achieve 15W (Power = Voltage 2$\times$ Current), fast chargers use specific voltage/current combinations.3
Standard | Output Profile | Power (W) | Note |
USB Power Delivery (PD) | 5V / 3A | 15W | This is the most common profile for 15W PD, using the base 5V but maxing out the current. |
Qualcomm Quick Charge (QC) | 5V / 3A | 15W | Some QC chargers use this profile for 15W. |
Qualcomm Quick Charge (QC) | 9V / 1.67A | $\approx 15W$ | A slightly higher voltage approach, especially common in older Samsung "Adaptive Fast Charging" (AFC) chargers, which is compatible with QC 2.0/3.0. |