Wednesday, May 22, 2024

Reference Design For A 45 Watt USB Charger

The USB Power Delivery (USB PD) 45W Mobile Charger reference design can help design power supplies with low standby power, full-regulation output voltage, high efficiency, and reliability.


Rechargeable electronic devices like smartphones, tablets, and notebooks have limited battery capacities; hence efficient and fast charging is essential for uninterrupted usage. The charging techniques ensure convenient power replenishment on the go, enabling users to stay connected and productive. The advanced charging techniques help optimize charging speed, minimize heat generation, and ensure device safety. NXP has launched a Universal Serial Bus Power Delivery (USB PD) 45W Mobile Charger reference design to simplify the USB charger design process. With the USB PD 45W Mobile Charger, power supplies featuring low standby power, full-regulation output voltage, high efficiency, and reliability can be designed. The design specifically caters to power supplies for mobile and notebook devices, accommodating power requirements of up to 100W. The reference design streamlines the design process for users by minimizing the need for external components.

The design is based on the quasi-resonant controller, synchronous rectifier controller, as well as USB-PD Type-C and Quick Charge (QC) 4.0 controller. The USB PD 45W Mobile Charger is designed to provide a maximum output power of 45 W, with a maximum current of 3 A. It offers the flexibility to select output voltages ranging from 5 V up to 20 V. The design provides an efficient and effective solution for USB Power Delivery and quick charge applications, ensuring low current ripple and high efficiency. The design provides multi-protocol support for USB Power Delivery (USB-PD) 2.0 and 3.0 and Quick Charge 4.0. The features like no-load power, low audible noise, and low output voltage ripple ensure the high performance of the USB PD charger.  

The compact design excels in thermal management, ensuring safe operation with a comprehensive set of hardware-integrated protection features. The reference design minimizes development time and reduces research and development costs. The USB PD charger operates at an AC main voltage of 90 V(AC) to 264 V(AC) and delivers a maximum output power of 45 watts. The ambient temperature of the adapter inside the casing ranges from -40 °C to 85 °C. Operating within an input frequency range of 47Hz to 63Hz, the design demonstrates exceptional efficiency, surpassing 92%.

This reference design has been tested by NXP. It comes with a Bill of Material (BOM), schematics, Printed circuit board (PCB) layout, etc. You can find additional data about the reference design on the company’s website. To read more about this reference design, click here.

Nidhi Agarwal
Nidhi Agarwal
Nidhi Agarwal is a journalist at EFY. She is an Electronics and Communication Engineer with over five years of academic experience. Her expertise lies in working with development boards and IoT cloud. She enjoys writing as it enables her to share her knowledge and insights related to electronics, with like-minded techies.


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