On April 18, 2024, Da Lian Da Holdings, an international leading semiconductor component distributor dedicated to the Asia Pacific market, announced that its subsidiary Quanding has launched a 240W PD3.1 fast charging solution based on Richtek's RT7333, RT7795, RT7220E, and RT7209 chips.

With the release of the PD3.1 fast charging protocol, USB charging technology has achieved significant breakthroughs. This protocol increases the output voltage of the power supply to 48V and synchronously increases the charging power to 240W. In this context, traditional flyback schemes and protocol chips suitable for 20V output are no longer able to meet the current market demand. Equipment manufacturers need to update their hardware designs to support higher voltage and power levels. To accelerate manufacturer design, Dalian Quanding has launched a 240W PD3.1 fast charging solution based on Liqi Technology's RT7333, RT7795, RT7220E, and RT7209 chips.

This scheme is equipped with front-end PFC boost control, AHB asymmetric half bridge drive control, and SR control strategy, and is also equipped with a PD3.1 protocol chip that supports 48V output. This means that the solution can achieve full voltage crossover input adaptation from 100Vac to 240Vac. Not only that, this solution also supports a standard power output of up to 48V/5A 240W, which can meet the power needs of the vast majority of laptops, mobile phones, and other devices that support Type-C power supply in the market. In addition, the solution can also support multiple private fast charging protocols and is equipped with various protection mechanisms, which can effectively prevent potential safety hazards such as overvoltage, overcurrent, and overheating, ensuring charging safety.

At the technical level, this solution adopts advanced AHB asymmetric half bridge control technology, which achieves faster charging speed by reducing power consumption, improving efficiency, and reducing heat generation. Meanwhile, this solution has extremely high integration, which can significantly reduce the size of the charger and bring users a more convenient and efficient charging experience.

Core technological advantages:

The scheme adopts PFC+AHB asymmetric half bridge architecture;

Compatible with 3V~55V output;

Reduce initial stress;

Higher efficiency than flyback, lower cost than LLC;

Support various mainstream fast charging protocols, especially PD3.1 (48V output) and UFCS;

Contains various protective mechanisms, especially LPS;

High integration, low cost.

Scheme specifications:

90Vac~264Vac input;

5V/3A, 9V/3A, 15V/3A, 20V/5A, 28V/5A, 48V/5A outputs;

DoE VI, Level 6 energy efficiency;

EMI margin above 6dB;

Supports multiple fast charging protocols such as PD3.1, QC4.0, and UFCS;

OCP, OVP, OTP, OPP, LPS various protections.

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