On February 13, 2020, Xiaomi officially released the Xiaomi 10Pro series mobile phones and some accessories products to millions of viewers through online live broadcast. Among them, Xiaomi 65W gallium nitride charger became an important highlight of this press conference.
According to Xiaomi CEO Lei Jun , this charger has the characteristics of small, efficient, low heat generation, and supports Xiaomi 10Pro super fast charging. It only takes 45 minutes to charge a 4500mAh super large battery from 0% to 100%. Xiaomi has become the first brand mobile phone company to retail GaN USB PD fast charging separately, and the retail price of 149 yuan hits a new industry low, which has attracted high attention from industry insiders.
Charging Head Network purchased this charger as soon as possible and conducted detailed reviews on it. The internal materials of Xiaomi 65W gallium nitride charger have always been the focus of users' attention. Next, the charging head network will reveal it to everyone through the detailed disassembly of the product.
1. Xiaomi GaN Charger Type-C 65W Appearance
Xiaomi 65W Gallium Nitride PD fast charging charger uses a white outer packaging box, with the appearance picture of the charger printed on the front in the center, and the upper right corner is an orange Xiaomi logo. Product name: Xiaomi GaN Charger Type-C; the words 65W are printed on the lower right corner.
Tiandi and Earth cover packaging box, the inside is made of paper-lined fixed charger, and the protection is in place. The whole package looks very delicate too.
comes with an USB-C to USB-C data cable, which can be used to charge laptops, mobile phones and other devices with USB-C interface.
A list of items in the packaging box, including a charger, data cable, and instruction manual. The wire that is standard for
is 1 meter long. The wire E-Marker information is read through the ChargerLAB POWER-Z KM001C tester. The wire supports 20V 5A current transmission capacity, which is commonly known as 100W 5A E-Marker wire. In terms of data transmission, it supports USB2.0 transmission rate.
Xiaomi 65W gallium nitride PD fast charger is made of white PC material, with a piano paint treatment process, which is very smooth. Considering the appearance integrity, the charger is wrapped in a protective film when leaving the factory. The side of the charger body is an arc transition, and the words "XIAOMI 65W" are printed on silkscreen. The charger input is fixed pin, and the output is a single USB-C port.
This charger has a slightly larger cross-sectional area than a one-yuan coin, is small in size, can be easily held with one hand, and is very portable.
output terminal USB-C interface uses a white glue core, and 8 contacts are provided on each side.
charger pins are printed on the side of the product's brand parameters, model: AD65G, input: 100-240V~ 50/60Hz 1.7A, output: 5V/3A, 9V/3A, 10V/5A, 2V/3A, 15V/3A, 20V/3.25A, 65W MAX, has passed the CCC certification. Manufacturer: Nanjing Kuke Electronic Technology Co., Ltd.; Supervisor: Jiangsu Zimi Electronic Technology Co., Ltd.; Manufacturer: Dongguan Furuikang Holdings Co., Ltd.
three chargers, from left to right, are Xiaomi 65W gallium nitride PD fast charger AD65G, Xiaomi 65W PD charger AD651 and Xiaomi 45W PD fast charger CDQ02ZM. By comparing the volume and power of Xiaomi's other two chargers, the advantages of gallium nitride fast charging can be clearly felt.
After actual testing, the charger width is about 31mm. The thickness of
is also about 31mm.
charger length is about 56.2mm.
After weighing measurement, the weight of Xiaomi 65W gallium nitride fast charger is about 82g.
Many netizens questioned that long strip chargers are easily dropped when used for wall plug-ins. In fact, this is not the case, because the size and weight of this charger of Xiaomi are relatively small, and there is also enough support surface on the pin side to adapt to wall plugs and other usage scenarios. When used for plugging, you don’t have to worry about the charger being too large and occupying the hole position next to it, and the margin is quite sufficient.
uses ChargerLAB POWER-Z KM001C to detect the charger output protocol, and it shows that it supports BC1.2, Apple2.4A, AFC, FCP and other protocols.
By tricking you can see that it also supports QC3.0 ClassB, with a maximum voltage of 20V.
Use ChargerLAB POWER-Z KM001C to continue to detect the charger's PDO message, and it shows that it supports five-speed fixed voltage gears of 5V/3A, 9V/3A, 12V/3A, 15V/3A, 20V/3.25A, and two-speed PPS voltage gears of 5-11V/3A and 5-20V/3.2A.
2. Xiaomi GaN Charger Type-C 65W Disassembly
First open the charger shell from the output end, you can see that the two PCB boards are arranged in an L-shaped layout.
After opening the shell, the internal PCBA module cannot be taken out directly, so you can only use the cutting machine to continue cutting the shell.
After removing the internal PCBA module, it can be seen that the outer periphery is wrapped with a large area of copper sheets, and the input end is supported and insulated with a plastic skeleton.
From the output, a larger volume of primary filter capacitor is placed between the two PCB boards, and the outer periphery is wrapped with horse-drawn tape, and a rubber insulating sleeve is also placed on the top.
Remove the copper sheet on the periphery of the PCBA module. An insulating plastic plate and horse-drawing tape are pasted on the inside of the copper sheet, and a thermal pad is added to the corresponding position of the chip.
Xiaomi 65W gallium nitride charger uses a planar transformer, with a copper foil shielding layer wrapped on the outside. The PCB board where the plane transformer is located is also equipped with an synchronous rectifier chip and a synchronous rectifier MOS tube, and silicone and small pieces of thermal pads are used to enhance thermal conductivity.
primary filter electrolytic capacitor and the transformer are fixed by glue injection, and there is a gap between the electrolytic capacitor and the two PCB boards.
continue to remove the plastic skeleton at the input end. It can be seen that there are two small PCB boards on the input end. Safety capacitors, common mode inductors and rectifier bridges are respectively set on the two small PCB boards at the input end of
; the words TEC25001 are printed on the copper foil of the transformer. When assembling the charger, a small-volume thermal pad is provided on both sides of the transformer. The power input of the
PCBA module is realized through two gold sinking contacts on the bottom main PCB.
remove the input filter electrolytic capacitor, one of the pins is fitted with an insulated rubber sleeve, and a rubber pad is pasted on the PCB board at the bottom.
Remove the insulating horse-drawing tape, and the electrolytic capacitor specification is 400V and 100μF.
electrolytic capacitor brand is AiSHi, with a temperature resistance of 105℃.
Another small volume input filter electrolytic capacitor is also from Aihua, with a specification of 400V 18μF. The PCB board with safety X capacitors and delay fuses are provided on the input terminal of
, and the delay fuse is 3.15A 250V. The output end of the
charger uses two rectifier bridges, which are both spread out and heat.
main PCB board list, the right side is the primary side and the left side is the secondary side. There is a multi-optical EL1018 optocoupler between the primary and secondary, for output voltage feedback. At the same time, four chip Y capacitors are also used to output anti-interference.
primary side two gallium nitride power chips are from Nanwei semiconductor , with models NV6115 and NV6117 respectively, which are also the core components of the entire product. It is understood that NV6115 and NV6117 have built-in drivers and complex logic control circuits, 170mΩ resistance and 120mΩ resistance, withstand voltage of 650V, supports 2MHz switching frequency, and adopts a 5*6mm QFN package to save area.
nanomicrosemiconductor NV6115 Detailed information.
nanomicrosemiconductor NV6117 detailed information.
Next to the two gallium nitride power chips is an ON Semi controller NCP51530B.
ON Semi NCP51530 is a 700V high-voltage and low-voltage driver with 3.5A power supply and 3A sink current driving capabilities, suitable for AC and DC power supply and inverters. The NCP51530 provides optimal transmission delay, low quiescent current and low switching current during high frequency operation, and the chip is designed for efficient power supplies for high frequency operation. There are two versions of NCP51530, NCP51530A/B. The NCP51530A has a typical 60 ns propagation delay, while the NCP51530B has a typical 25 ns propagation delay. The NCP51530 is available in SOIC8 and DFN10 packages.
billion optical EL1018 optocoupler, used for output voltage feedback. There is a VBUS switch on the back of the
HD interface, which uses Toshiba TPCC8104 PMOS tube.
Toshiba TPCC8104 Detailed information.
has a protocol chip on the back of the main PCB board, and the primary side is a main control chip.
USB PD fast charging protocol chip uses Cypress CYPD3174, which supports PD3.0 including PPS protocol, supports QC4.0, Apple 2.4A and other fast charging protocols; has multiple comprehensive protection functions, a built-in 32-bit M0 processor, an integrated oscillator and no external clock is required.
Cypress CYPD3174 Detailed information.
comes from TI Texas Instruments' UCC28780 primary controller. Its operating frequency can reach 1MHz, which is much higher than the common civil switching power supply frequency. It also complies with increasingly stringent energy consumption and efficiency standards, supports GaN power tubes, and has a variety of built-in protection functions.
TI UCC28780 Detailed information.
There is also a silk-print D8B LDO next to the protocol chip.
is on the left side of the transformer PCB board, and is equipped with a synchronous rectification controller, a synchronous rectification MOS tube and a patch capacitor. Through the words "Design by Cukteck" on the PCB board, we learned that Xiaomi 65W gallium nitride USB PD fast charging charger was developed by Kuke, which shows that Kuke has profound attainments in the research and development of GaN gallium nitride charger.
synchronous rectification control uses MPS core source semiconductor MP6908.
MP6908 detailed specification parameters.
secondary synchronous rectifier MOS tube uses Infineon BSC0805LS, 100V withstand voltage and 7mΩ resistance.
Infineon BSC0805LS Detailed information.
planar transformer width is about 18mm.
has a length of about 25.4mm.
thickness is about 9.9mm. Behind the transformer are two kemet tantalum polymer capacitors, used for output filtering, 100μF25V, and two in parallel. This capacitor is also used in Apple 87W USB PD charger. All the chargers of
have been disassembled.
charging head network disassembly summary
Xiaomi's 65W charger broke through the technical barriers after using gallium nitride power devices and concentrated the volume to 30.8×30.8×56.3mm. Not only does the product's power density reach 1.21W/cm³, but the weight of the charger is also controlled at 82g, truly achieving high power, small volume, lightweight and portable.
has been tested in the charging head network. Xiaomi 65W gallium nitride charger has five fixed voltage levels: 5V/3A, 9V/3A, 12V/3A, 15V/3A, 20V/3.25A, and supports two PPS voltage levels: 5-11V3A/5-20V3.2A. It is also compatible with APPLE2.4A, Samsung AFC, Huawei FCP, QC3.0, etc., with a wide range of support protocols and is compatible with most mobile phones, laptops, mobile power supplies and other products on the market. Through disassembly, the Xiaomi 65W gallium nitride charger can achieve a breakthrough in power density, mainly due to the GaNFast gallium nitride power chips NV6115 and NV6117 with built-in nano-semiconductor, which is paired with ON Semiconductor, high-frequency switching is achieved, thereby greatly reducing the volume of the transformer. At the same time, this charger uses a chip capacitor to further compress the volume. In terms of compatibility, Cypress's solution is used. The performance of CYPD3174 is not the case. In addition to the conventional protocol, it can also achieve 50W fast charging for Xiaomi 10 Pro. In terms of heat dissipation, the power devices and transformer parts inside the charger have added thermal pad designs, and the entire PCBA module is wrapped with copper plates to dissipate heat evenly. The entire product uses solid materials and fine workmanship, which is a fine product among chargers.
