Above all, facing the vast 20W fast charger market brought by the iPhone 12, Maxso launched a PD 20W fast charger for customers. In short, this charger’s shape and size are similar to Apple’s original 20W charger, but the output performance is better. It can support QC, AFC, FCP, and PD3.0 fast-charging protocols and has a wide range of compatibility. Not only for iPhone 12 but also it can quickly charge other mobile phone brands. Let’s take a look at the details of this charger.
Appearance
This charger adopts a PC flame-retardant white shell and with a glossy finish. The unit body is white and smooth, with a simple style.
The input end is with American standard pins.
The output’s top surface is concave, with a grey color, and with a USB-C interface in the center.
The input shell is grey and marked with detailed parameters
Model: LQ-017A-20C
Input: 100-240V~50/60HZ 0.5A
Output: 5V3A, 9V2.22A, 12V1.67A
Manufacturer: Shenzhen Lucky Leader Electronic Technology Co., Ltd.
CCC, ETL, FCC approved.
Measuring the charger body by a vernier caliper, the size is 41.1mm x 42.4mm x 27.3mm (L*W*H). You can check the details below:
Comparing with Apple 20W charger, the size is nearly similar.
Particularly, the thickness is a bit larger than the diameter of a dollar coin.
The intuitive feeling of holding it on your hand.
The net weight of the charger is about 47g.
Use Charger LAB POWER-Z KT002 to detect the USB-C port output protocol and show that it supports Apple 2.4A, Samsung 5V2A, DCP protocol QC2.0/3.0, AFC, FCP, and PD3.0 fast charging protocols.
Besides, the PDO message shows that the USB-C port also has three sets of fixed voltage gears: 5V3A, 9V2.22A, and 12V1.67A.
Disassemble the Maxso 20W PD fast charger
Disassemble the output end shell, the edge of the shell is packaged by ultrasonic welding, and there is a protruding plastic in the center to fix and protect the female seat.
After observing and analyzing the charger circuit, you can see that this 20W PD fast-charge charger adopts a switching power supply with a wide range of output. The protocol chip controls the typical architecture of the output voltage through an optocoupler. Below we start from the input terminal to understand each component one by one.
Look at the input terminals. The pins contact the metal sheet and power up.
Fuse jacket heat shrink tube protection.
The input end ABS210 rectifier bridge.
Look at the PCB board’s side. High-voltage filter electrolytic capacitors, Y capacitors, and synchronous rectification output filter solid capacitors are glued.
The specifications of the two high-voltage filter electrolytic capacitors are both 400V 15μF, HUAHONG brand.
I-shaped inductance jacket heat shrinkable tube.
A look at the other side of the PCB board.
A close-up of the PWM main control chip’s power supply capacitor, the specification is 50V 10μF.
The charger main control chip adopts Shengting Micro D8549HF.
Transformer close-up, horse-drawn tape wound for insulation.
Look at the output terminals, the USB female socket is welded vertically with a small board.
We used JC357 optocoupler, spanning between the primary and secondary, for primary-secondary communication, feedback, and output voltage regulation.
A close-up of Y capacitor, used for output anti-interference.
Dongke Semiconductor’s high-performance dual-pin synchronous rectifier chip DK5V60R10S. The chip integrates a 60V power NMOS tube, which can greatly reduce the diode conduction loss, improve the efficiency of the whole machine, replace or replace the current iso-regular Schottky rectifier diodes on the market, support a variety of working modes, and can directly replace Schottky, The chip is packaged in SM-7.
Dongke DK5V60R10S data information.
Synchronous rectification output filter solid capacitor, the specification is 16V 680μF.
Remove the small output board. The front side is provided with the protocol chip and the USB socket.
A look at the back of the small board.
The USB PD protocol chip uses Yunxi Semiconductor XPD720. This chip has passed the USB PD3.0 certification, TID: 3479, and supports fast charging protocols such as QC2.0, QC3.0, AFC, FCP, SCP, HVSCP, PD and PPS, Integrated 10mΩ VBUS channel power switch tube, and integrated current detection resistor, saving the number of external components and reducing costs. It is packaged in ESOP8.
Yunxi Semiconductor XPD720 data information.
A close-up of the USB-C female socket, the main body is plastic.
After all the dismantling is complete, let’s take a family portrait.
to sum up
Maxso 20W PD fast charger looks like Apple’s 20W charger, with grey color matching on the input and output end shells and special interfaces, which are more intimate for those used to Apple chargers. The product has passed the 3C certification, is compatible with multiple fast charging protocols, supports 5V3A, 9V2.22A, and 12V1.67A output, and can meet most mobile brands’ changing needs phones including the iPhone 12.
The disassembly of the charging head network learned that using a highly integrated fast charging solution is another major feature of this product. The switching power supply is composed of Shengting Micro D8549HF and Dongke synchronous rectification chip, and Yunxi Semiconductor XPD720 performs protocol identification and control output voltage. The streamlined circuit can reduce costs effectively. The protocol chip supports multiple fast-charging protocols and is suitable for fast charging of various models. The input end adopts the pin contact type power supply. The output end is equipped with a small board, and the capacitor transformer is glued and reinforced. The USB female seat is all plastic in design. In general, this product is practical, cheap, and cost-effective.
