After the 20W PD optimization plan CX7527C+CX7538B was selected and adopted by local brands, foreign e-commerce brands are also adopting it one after another. For more top brands to choose from, please continue to follow the CXW official website!

Following the selection and adoption of the 20W PD preferred solution CX7527C+CX7538B by local brands such as Yubo, Philips, Patriot, and MORMAX, foreign e-commerce brands such as Ohm Motor and Japan's Tama are also adopting this solution one after another. For more major brands to choose from, please continue to follow www.cxwic.net

20W Ohm Motor Disassembly, CX7527C+CX7538B Solution Application

The dismantling content: 20W PD fast charging charger produced by Ohm Motor Co., Ltd

The entire machine is compact and simple, equipped with foldable pins for easy carrying, and compatible with multiple mainstream fast charging protocols, meeting the fast charging needs of iPhone 12 series phones.

Parameters:

• Model: MAV-APD20W-W

• Input: 100-240V~50/60Hz 0.5A

• Output: 5V3A, 9V2.22A, 12V1.66A

• Manufacturer: Ohm Motor Co., Ltd

• The product has passed CQC and PSE certification

• 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, SCP, PE2.0, PD3.0, and PPS fast charging protocols.

The PDO message shows that the C port also has three fixed voltage ranges of 5V3A, 9V2.22A, and 12V1.66A as well as a PPS voltage range of 3.3-11V2A.

Ohm motor 20W charger disassembly process:

The PCB module consists of three boards: input, output, and USB motherboard. The input and output boards are supported and fixed by plastic shells and undergo primary isolation.

It is obvious that this machine adopts the complete solution of CX7527C+CX7538B. CX7527C is a high-performance multi-mode PWM flyback controller, which is convenient for users to design high-performance AC/DC conversion switching power supply with fewer peripheral components and lower system cost. 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 chip's working frequency decreases, effectively reducing switching 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 an 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.

The Ohm Motor 20W charger is small and exquisite, and is compatible with QC, AFC, FCP, SCP, PE2.0, PD3.0, and PPS mainstream fast charging protocols, with a 3.3-11V2A PPS voltage range.

The overall solution adopts a highly integrated CX7527C+CX7538B solution, which has great advantages in product design, cost, and acceleration of market launch, and has been highly recognized by domestic and foreign customers.