At Apple’s 2025 “Awe Dropping” event held a few days ago, the company officially launched the iPhone 17 series. What surprised us the most was Apple’s claim that when using a 40W or higher power adapter with a USB-C charging cable, the iPhone 17 and iPhone 17 Pro Max can charge up to 50% in just 20 minutes—a new milestone in iPhone fast charging!
Launched alongside the phones, the 40W Dynamic Power Adapter delivers peak power up to 60W and supports the latest PD 3.2 AVS charging protocol. Working in tandem with the iPhone 17 series’ built-in charge pump, this combination significantly shortens charging times, reduces heat buildup, and provides users with a convenient and efficient charging experience.
Key specifications of this charger:
- Model: A3365
- Input: 100-240V~, 50-60Hz, 1.5A (USB PD)
Output:
- (AVS) 15.0–20.0Vdc, 2.0A [3.0A DPS]
- (AVS) 9.0–15.0Vdc, 2.67A [3.0A DPS]
- 9.0Vdc, 3.0A
- 5.0Vdc, 3.0A
- Max total output power: 60W
- Manufacturer: Salcomp Technology (Shenzhen) Co., Ltd.
- (For use at altitudes of 5000m or below)
In October 2024, the USB-IF officially released USB PD 3.2. Compared with PD 3.1, the major update lies in the introduction of an Adjustable Voltage Supply (SPR AVS) mechanism within the Standard Power Range (27W–100W). This allows devices to fine-tune the charging voltage between 9V and 20V in precise 100mV steps, enabling more efficient power conversion and reducing heat loss.
In addition, under the Extended Power Range (EPR) mode, PD 3.2 adds “Peak Current”, enabling power supplies to safely handle short bursts of high-power loads—such as those required during heavy computing on high-performance laptops.
PD 3.2 also refines the version negotiation process between ports and E-marker cables. Even before an explicit power contract is established, it can automatically detect and determine a compatible protocol version. This prevents negotiation failures between new and legacy devices and cables, greatly improving cross-generation interoperability.
Furthermore, with the new Vendor Defined Extended Message (VDEM) framework, manufacturers gain a dedicated channel for proprietary functions such as firmware updates and policy delivery. It also supports secure segmented transmission of messages and firmware, pushing the ecosystem beyond PD 3.1 in terms of flexibility, intelligent management, and security.
ChargerLAB previously compiled a timeline of USB charging standards, providing an easy reference for tracking the evolution of each stage.
The ChargerLAB POWER-Z KM003C tester had already integrated PD 3.2 AVS detection back in October last year. This not only serves as a compliance verification tool for the industry but also allows ordinary users to quickly confirm whether a charger supports PD 3.2 AVS power delivery.
The official release of the USB PD 3.2 fast charging protocol by USB-IF in October 2024 marked a step toward smarter and more ecosystem-oriented charging technology. Apple’s newly launched 40W Dynamic Power Adapter leverages the PD 3.2 AVS mechanism, enabling safe overload support for short bursts of high-power demand. With 60W peak power and multiple AVS output modes, it works seamlessly with the iPhone 17’s charge pump to deliver an impressive “50% charge in 20 minutes” experience.