Disassembly report: bankex 65W 1a1c Gan fast charging charger

Recently, Benks bankex launched its first 65W Gan fast charging charger, which is equipped with the current popular 1a1c interface and supports 18W and 65W fast charging. In addition, it also supports 18W + 45W dual port charging strategy to meet the demand of charging mobile phones and laptops at the same time.

Another feature of the product is its small size. As a 65W multi port charger, it is smaller than Apple's 30W charger, and it is very portable with foldable pins. Next, the charging head network will be disassembled in detail. Let's take a look at the internal design of the charger.

1、 Appearance of bangkesi 65W Gan charger

The charger adopts PC flame retardant material white shell, the surface is all frosted, the body corner transition is smooth, the overall volume is very small, and the design is very simple.

The Benks brand logo is printed on the front.

The bottom is marked with charger parameter information

Model: pa45

Input: 100-240V ~ 50 / 60Hz 1.5A

Total output: 65W




iPhone 12 charger cable

Manufacturer: Shenzhen dibike Electronic Technology Co., Ltd

The input end is equipped with foldable GB pins, and two wings are added on both sides for more stable use.

The output end is equipped with LED indicator and 1a1c interface, which are all black rubber core.

The measured length of charger body is 53.13mm by vernier caliper.

The width is 51.92mm.

The thickness is 30.85mm.

Compared with apple 61W charger, the volume advantage is very obvious.

iPhone Charger Cable

The intuitive feeling of holding it in the hand.

The net weight is about 117g.

When the power is on, the LED indicator lights blue.

Using chargerlab power-z kt002 to detect usb-a port output protocol, the display supports apple 2.4a, Samsung 5v2a, DCP protocol, and qc2.0 / 3.0, AFC, FCP, pe2.0 fast charging protocol.

In addition, kt002 is used to detect the output protocol of usb-c port. The display supports apple 2.4a, Samsung 5v2a, DCP protocol, and qc2.0 / 3.0, AFC, FCP, SCP, pe2.0, pd3.0 fast charging protocol.

In addition, the PDO message shows that the usb-c port also has five groups of fixed voltage gears: 5v3a, 9v3a, 12v3a, 15v3a and 20v3.25a.

2、 Disassembly of bangkesi 65W Gan charger

The fuselage shell is disassembled from the side, the top of PCB module is covered with brass heat sink, and the whole heat sink is pasted with insulating tape.

The pin and the PCB board are connected and powered by red and black wires, and in addition, a plastic board and a capacitor are provided for isolation.

Glue is applied under the heat sink to help strengthen and conduct heat. After cleaning, you can see that there are filter inductors and solid-state capacitors in the center, and isolation plates are set between the primary stages.

The back of the motherboard is also equipped with brass heat sink and isolation board.

Remove the heat sink, glue the middle section of the plate to fix the isolation plate and heat the heating element.

The primary side is equipped with a main control chip and a GaN power chip, and the secondary side is equipped with a synchronous rectifier controller and MOS transistor.

Through the observation of the charger, it is found that the 65W 1a1c Gan charger of bankex adopts the switching power supply, the output voltage is controlled by the protocol chip through the optocoupler, the output voltage is output by the usb-c port, the usb-a port is output by the up and down conversion voltage, and the two interfaces are controlled by the independent protocol chip. Next, we start from the input to understand the whole circuit design.

There are three high voltage filter electrolytic capacitors on the left side, one is welded on the main board, and the other two are welded with small plates.

In addition, there is a capacitor on the side between the input and output end plates, which is protected by an insulating tube.

Close up of time delay fuse, 3.15a 250V.

There are two stages of common mode inductor, X capacitor and rectifier bridge on the small board.


There are no soldered components on the back.

Common mode inductor close-up, used to Filter EMI interference.

Details of Intel ip2163. According to the disassembly of the charging head network, the products that use the IP 2163 protocol chip of ICIC include REMAX 22.5w fast charging two in one mobile power supply, 27W original charger of Xiaomi 9 mobile phone, Meilan M20 bidirectional flash charging mobile power supply, Haiyun qc3.0 fast charging power adapter, etc.

Summary of dismantling charging head net

This 65W gallium nitride charger is designed in square shape, and the overall design is very simple. The fuselage corner transition is mellow, the surface all grinds the sand processing, the touch feeling is good. The input end is equipped with foldable pin, which is easy to carry. The charger supports QC, AFC, FCP, SCP, pe2.0 and pd3.0 fast charging protocols to meet the charging needs of mobile phones and laptops of Huawei, Xiaomi and other brands.

Through the disassembly of the charging head network, we know that the internal components of the charger are compact in layout, the input and output terminals are equipped with small plates, and the components such as capacitors and transformers are glued. The switching power supply of the charger is composed of an SenMei ncp1342 with nano micro Gan power chip and MPs mp6908a with Wandai synchronous rectifier.

The output voltage of usb-c port is controlled by ip2723t. The usb-a interface uses sc8903 for voltage up and down conversion, and ip2163 for protocol identification to control the output voltage of a port.