In the design of mobile devices, the Type-C interface has gradually become the mainstream of design due to its significant advantages in data line unification and data transmission. And with the continuous improvement of the intelligent level of mobile devices, the demand for high-power fast charging of mobile devices is also rising. In this context, various mobile phone and PC manufacturers have successively launched Type-C chargers that support PD fast charging to meet market demand. However, due to the different specifications of PD chargers on the market, the internal solutions used are also different. In order to provide manufacturers with a complete set of fast charging solutions and accelerate product design, Dalian Daquan Ding launched a 65W Type-C PD fast charging solution based on Richtek RT7757+RT7220D+RT7202KLA chips.
Richtek is an advanced analog IC design company. It has a rich and comprehensive range of devices and can provide a complete set of fast charging solutions for power supply manufacturers. This solution consists of Richtek's PWM controller RT7757 supporting zero voltage switching (ZVS), synchronous rectifier RT7220D and programmable controller RT7202KLA. Among them, RT7202KLA is a programmable controller including feedback compensation and internal voltage regulator. Its internal integrated MCU can process various protocols through CC1/CC2/D+/D- interfaces.
And the controller is also designed for the off-line high power density AC/DC converter used in the fast charging system, and the output power can be distributed through the Master/Slave communication on the I2C bus. In addition, the device's built-in feedback compensation not only reduces the number of external components, but also improves transient response.
With the excellent performance of the device and the company's advanced technology, this solution has a very high degree of integration, and due to the use of secondary ZVS control technology, the solution has a good performance in terms of power consumption, efficiency and heat reduction. In terms of fast charging, this solution is compatible with the most widely used QC4.0, PD3.0 and recently popular UFCS charging protocols on the market. It can realize 100-240Vac full voltage cross-border adaptation and support 65W standard power output. It can easily transmit power to most mobile devices such as notebooks and mobile phones that support Type-C power supply.
Core technical advantages:
● The working frequency of the scheme is 25KHz～130KHz;
● Compatible with 3～20V output;
● It has QR/CCM and valley switching technology, and adopts SR ZVS control;
● SR controller can withstand voltage up to 200V;
● Support various mainstream fast charging protocols, especially UFCS;
● Contains various protection mechanisms, especially LPS;
● High integration, low cost.
Program Specifications:
● 90Vac～264Vac input;
● 5V/3A, 9V/3A, 15V/3A, 20V/3.25A output;
● DoE VI, level 6 energy efficiency;
● EMI 6dB margin;
● Support PD3.0, QC4.0, UFCS and other fast charging protocols;
● Support OCP, OVP, OTP, OPP, LPS various protection mechanisms.
