Undertake the development of 18W-65W PD fast charging solution, and provide spot supply of CX7527C and CX7538B

The new Sibao 1A1C dual port 18W PD fast charging charger uses a CX7527C+CX7538B combination chip

Development of 18W-65W PD fast charging solution, CX7527C, CX7538B available from stock

The new Espao European standard 18W fast charging charger is equipped with a 1A1C interface and supports 18W fast charging, which can meet the fast charging needs of both new and old devices, and can also charge two devices simultaneously without waiting.

Next, we will conduct a detailed disassembly of this dual port 18W fast charging device

Charger parameter model: QM10

Input: 100-240V~50/60HZ 0.5A

Output: 5V3A, 9V2A, 12V1.5A

The product has passed CE, FCC, and RoHS certifications

Using ChargerLAB POWER-Z KT002, it was tested that the USB-C port supports Apple 2.4A, Samsung 5V2A, DCP protocols, as well as QC2.0/3.0, AFC, and PD3.0 fast charging protocols.

In addition, it was also measured that the C port has three fixed voltage ranges of 5V3A, 9V2A, and 12V1.5A.

In addition, it was tested that the USB-A port supports QC2.0/3.0, AFC, and FCP fast charging protocols.

After disassembly, we can clearly see that the primary power supply of the main control adopts the CX7527C, which is a high-performance multi-mode PWM flyback controller. This product facilitates users to design high-performance AC/DC conversion switching power supplies with fewer peripheral components and lower system costs. It provides extremely comprehensive and excellent intelligent protection functions, including cycle by cycle overcurrent protection, overload protection, soft start, chip over temperature protection VDD undervoltage/overvoltage locking protection function.

The chip has the function of automatically identifying the size of the load and adjusting the working mode; Under full or heavy load conditions, the chip operates at a fixed frequency of 65KHz; When the load is reduced, the operating frequency of the chip decreases, effectively reducing switch losses; When the load is in extremely light or no-load conditions, the chip is in interval mode.

The CX7527C has built-in intelligent frequency jitter technology to reduce electromagnetic interference and output ripple generated by the system in frequency reduction mode; The unique working mode minimizes audio energy and eliminates audio noise; Adopting SOP-8 packaging provides a good design platform for cost-effective flyback switching power supply systems that require ultra-low standby power consumption.

The secondary synchronous rectification chip adopts CX7538B

This is a high-performance switching power supply secondary side synchronous rectifier chip that easily meets level 6 energy efficiency in switching power supplies, making it an ideal replacement solution for Schottky. The CX7538B supports a maximum switching frequency of 150KHz and is equipped with a built-in 11m Ω low conductivity NMOS transistor, which generates much lower heat than Schottky diodes, significantly reducing temperature and improving conversion efficiency.

The CX7538B supports the CCM/QR/DCM mode of a switching power supply, which is very suitable for 3.3-12V fast charging synchronous rectification. It is equipped with a built-in 60V, 11m Ω synchronous rectification tube that can withstand voltage and provide 3A output. Compared to Schottky, it has a maximum efficiency improvement of 6%, a wide working voltage range, and very simple peripheral components. In wide voltage applications, only one capacitor is needed on the periphery, and the output terminal is listed. The USB-C base is welded to the small board, which is also used to support the upper and lower PCB boards.

The protocol chip adopts Tiandeyu FP6606AC for 1A1C dual port protocol recognition.

At present, the JD6606S is available in bulk supply, with a single C port/A+C dual port, and comes with a power reduction function. The JD6606S supports a 20-65W PD fast charging protocol solution.