Disassembly report: kunxing 18W USB pd3.0 PPS fast charging charger

Apple's new iPhone will be launched in 2019, with 18W USB PD fast charging charger set as standard for iPhone 11 pro and iPhone 11 Pro max. The appearance changes of iPhone charger and the improvement of charging speed of mobile phone constantly improve consumers' cognition of fast charging, which also stimulates other iPhone users' desire for fast charging.

18W USB PD fast charging has become a very hot word in the industry. Whether it is the original chip factory or the finished product factory, or the brand, 18W PD fast charging is a must. Recently, the charging head network learned that kunxing technology, a well-known charger manufacturer in the industry, has recently launched an 18W USB PD fast charging charger, which adopts an exclusive private model and has built-in high-performance fast charging solutions. Next, charging head network will introduce this product in detail through this article.

1、 Appearance of kunxing 18W USB PD fast charging charger

Kunxing's latest 18W USB PD fast charging charger has a flat oval appearance. Its shell is made of white PC flame retardant material and is equipped with national standard fixed pins. A usb-c output interface is set in the middle of the charger's output end. The input and output end panels are gray, which has the flavor of Apple original 18W.

Product information is printed on the pin side of the charger. Model: fc87c, S / N: 2019433f00076; Input: 100-240V ~ 50 / 60Hz 0.5A; Output: 5V / 3a, 9V / 2a, 12V / 1.5A; Shenzhen kunxing Technology Co., Ltd; The product has passed CCC certification.

The usb-c interface adopts black rubber core, and the end face does not expose copper.

Kunxing's 18W USB PD fast charging charger has the same thickness as 1 yuan coin in diameter.

The weight is about 50g.

iPhone Charger Cable


Using chargerlab power-z kt001 to detect the output protocol of the charger, the display supports apple 2.4a, USB DCP, qc3.0, qc2.0, AFC, FCP, SCP and other protocols.

Continue to detect the PDO message of usb-c interface, and display three fixed voltage ranges of 5V / 3a, 9V / 2a and 12V / 1.5A, and two PPS voltage ranges of 3.3-5.9v/3a and 3.3-11v/2a.

2、 Disassembly of kunxing 18W USB PD fast charging charger

The shell of the charger is ultrasonic welding, and the end of the pin at the input end is provided with shrapnel to contact and conduct electricity with the PCB board.

Take out the internal PCB board, the front component design is very compact, the input is filtered by two electrolytic capacitors, the output is filtered by two solid-state capacitors, and there is glue injection treatment near the capacitors. The primary and secondary PCB board adopts hollow design and is equipped with insulating baffle.
iPhone Charger Cable
It can be seen from the back of PCB that the circuit design of this charger is very simple. Besides rectifier bridge and optocoupler, there are only two chips.

The primary main control chip of this charger adopts the pn8161 of simponix. A quasi resonant current mode controller and a power MOSFET are integrated in the chip, which is specially used for high performance AC / DC switching power supply with compact peripheral components. The chip provides comprehensive and excellent intelligent protection functions, including output over-voltage protection, cycle by cycle over-current protection, overload protection and soft start function.

Through qr-pwm, qr-pfm, burst mode hybrid modulation technology and special device low-power structure technology, simpen micro pn8161 achieves ultra-low standby power consumption and optimal efficiency in full voltage range. Frequency modulation technology and softdriver technology fully ensure good EMI performance.
iPhone 12 charger cable
The secondary synchronous rectifier chip, pn8307h, is also from Simone microelectronics. The chip has built-in synchronous rectifier controller and high avalanche power MOSFET, which is used to replace secondary rectifier Schottky diode in high performance AC / DC flyback system.

In order to improve the current output capability and conversion efficiency, the power MOSFET with extremely low voltage drop is built in the simpen micro pn8307h, which makes the system efficiency meet the level 6 energy efficiency standard with enough margin. Pn8307h integrates all kinds of auxiliary functions, including output undervoltage protection, misoperation prevention, minimum on time and so on.

Summary of dismantling charging head net

Kunxing's latest 18W USB PD fast charging charger is compact, simple and beautiful. In terms of performance, it not only supports apple 2.4a, USB DCP, qc3.0, qc2.0, AFC, FCP, SCP and other protocols, but also supports USB pd3.0 PPS fast charging protocol. The maximum output power is 18W, which can realize fast charging for iPhone after 2017. It is also compatible with Xiaomi, Huawei, Huawei Samsung and other brands of mobile phone fast charge.
iPhone 12 charger cable

 of material consumption, this product adopts the AC-DC fast charging scheme pn8161 master control + pn8307h synchronous rectifier newly released by Xinpeng micro. Both chips adopt built-in MOS design, which has the advantages of ultra-high integration, stable performance and convenient debugging; The protocol chip adopts the high pass qc4 + Certification chip ip2726 of British chip to ensure the output compatibility. The whole set of fast charging scheme is very mature, PCB board is simple, material is fastidious, performance and cost are considered.