Maoshuo's 20W PD fast charging system is small and exquisite, thanks to the use of a full set of highly integrated, few components, and efficient and streamlined fast charging solutions from CX7527C and CX7538.

This 20W PD fast charger achieves such MINI and exquisite performance thanks to the use of a full set of high integration, few components, and high-efficiency streamlined 20W PD solutions using CX7527C and CX7538.

The Maoshuo Mini 20W PD Fast Charging Charger supports fast charging protocols such as QC and PD, and supports PPS fast charging, which can well meet the fast charging needs of iPhone 12 series phones.

Today we will bring you the disassembly of the Maoshuo Mini 20W PD Fast Charging Charger, and let's take a look at its design and workmanship.

Maoshuo Mini 20W Fast Charging Appearance

CX7527C+CX7538B Applied to Maoshuo Mini 20W PD Fast Charging Charger

The charger adopts a small square design, with a matte surface on the body shell, making it very compact and concise overall.

Charger parameters:

• Model: MS-H1670U120-020C0-CN

• Input: 100-240V~50/60Hz 0.6A

• Output: 5V3A, 9V2.22A, 12V1.67A

• Total output: 20W Max

The charger has passed domestic and international certifications such as CCC, CE, FCC, UL, ERP VI, etc

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, FCP, PD3.0, and PPS fast charging protocols.

In addition, the PDO message shows that the C port also has three fixed voltage ranges of 5V3A, 9V2.22A, and 12V1.66A, as well as two PPS voltage ranges of 3.3-5.9V3A and 3.3-11V1.8A.

Through observation, it was found that this charger uses a QR switching power supply with a wide range output, and the protocol chip controls the output voltage architecture.

It can be clearly seen that the power control chip of this charger adopts CX7527C. CX7527C is a high-performance multi-mode PWM flyback controller that 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 periodic overcurrent protection, overload protection, soft start, chip over temperature protection, and VDD undervoltage/overvoltage locking protection.

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 is equipped with intelligent frequency jitter technology to reduce electromagnetic interference and output ripple generated by the system in frequency reduction mode. Its unique working mode minimizes audio energy and eliminates audio noise. It adopts SOP-8 packaging, providing a good design platform for high cost performance flyback switching power supply systems that require ultra-low standby power consumption.

The secondary synchronous rectifier chip adopts the CX7538B, which is a high-performance switching power supply secondary synchronous rectifier chip that easily meets 6-level energy efficiency in switching power supplies. It is an ideal replacement solution for Schottky. The CX7538B supports a maximum switching frequency of 150KHz and is equipped with a 12m 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 switch mode power supply, which is very suitable for 3.3-12V fast charging synchronous rectification. It is equipped with a built-in 60V, 12m Ω synchronous rectification tube, which can provide 3A output, with a maximum improvement of 6% compared to Schottky efficiency. The working voltage range is wide, and the peripheral components are very simple. In wide voltage applications, only one capacitor is needed on the periphery.

The Maoshuo Mini 20W PD Fast Charging Charger has a compact and concise body, meeting the current consumer demand for 20W mini fast charging. In addition, the charger is compatible with QC2.0/3.0, AFC, FCP, PD3.0, and PPS fast charging protocols, and has two PPS voltage ranges of 3.3-5.9V3A and 3.3-11V1.8A. It can be well adapted to iPhone 12 series phones and meet daily fast charging needs.