Abstract

Abstract: A PD GaN fast charger negotiates power supply with end devices via USB-C PD handshake. The PD GaN fast charger supports PPS programmable power supply for dynamic voltage fine-tuning. This PD GaN fast charger covers handshake timing, PPS resolution and power profile parameters. It helps engineers verify interoperability and enable safe fast charging for phones and laptops.

1. PD Handshake Basics

After power-on, the PD GaN fast charger detects connected devices via CC pin. The PD GaN fast charger sends power capability messages and switches output after receiving device requests. When handshake times out, the PD GaN fast charger automatically falls back to safe 5V output.

2. PPS Programmable Regulation Parameters

PPS mode of the PD GaN fast charger supports 100mV voltage adjustment steps. The PD GaN fast charger dynamically adjusts voltage following battery charging curves. In mobile charging scenarios, PPS of the PD GaN fast charger reduces battery heat and improves charging efficiency.

3. Fixed Voltage Profile Configuration

Fixed profiles of the PD GaN fast charger include 5V,9V,15V,20V for phones, tablets and laptops. Maximum power of the PD GaN fast charger is limited by both hardware and protocol messages. Advertised capabilities of the PD GaN fast charger cannot exceed hardware limits to avoid overload.

4. Protocol Interoperability Testing

A PD GaN fast charger must pass interoperability tests with multiple device brands. The PD GaN fast charger must maintain stable handshake during hot plug and cable swap. Handling of abnormal messages determines real-world compatibility of the PD GaN fast charger.

5. EPR Extended Power Range

When equipped with PD3.2 EPR, the PD GaN fast charger delivers higher voltage profiles for high-power laptops. EPR requires certified EPR Type-C cables.

Conclusion

PD protocol and PPS regulation form the intelligence core of the PD GaN fast charger. For protocol interoperability testing of a PD GaN fast charger, contact Simsukian for test reports and samples.

References

1. USB-IF USB Power Delivery Specification

2. IEC 62680-1-2 USB PD International Standard

3. IEC 63002 External Power Supply Interoperability Standard