Preface
Xiaomi has launched a 120W small pudding gallium nitride charger, which is sold as a set, which contains a 120W small pudding charger and a 1.5-meter long data cable for users' convenience. The charger supports 100-240V input voltage, 65W output power when the input voltage is 110Vac, and 120W output power when the input voltage is 220Vac.
The measured charger supports 65W PD fast charging and also supports 33W UFCS fusion fast charging, which can not only meet the fast charging needs of Xiaomi mobile phones, but also fast charge laptops and Android phones of other brands. The following charging head network will bring the disassembly of Xiaomi's 120W small pudding charger, and let's take a look at the internal scheme and workmanship.
Xiaomi 120W GaN Small Pudding Charger unboxing
The front of the box is printed with the Xiaomi logo, the product name and the appearance of the set.
There is a product information sticker on the back.
Close-up of product specifications on the back.
The package contains a charger, a data cable, an instruction manual and a three-pack certificate.
The attached data cable is a USB-C to USB-C cable, and the network tail is designed with the word 6A, indicating that the cable can pass 6A high current.
The measured length of the data cable is about 150.3cm.
使用ChargerLAB POWER-Z KM003C测得线缆带有E-Marker芯片，支持20V5A PD快充，数据传输能力为USB 2.0。
The new charger continues the design language of Xiaomi's previous generation of 67W small pudding charger, with a glossy surface treatment and a very rounded transition.
机身正面印有120W以及Designed by Xiaomi字样。
另一面印有GaN和Designed by Xiaomi。
The input housing is printed with charger parameter information.
Close-up of product parameters
Model: MDY-16-EV
输入：100-130V~50/60Hz 2.0A
输出:5V3A、9V3A、11V6.1A、20V3.25A
输入：200-240V~50/60Hz 2.0A
输出:5V3A、9V3A、11V6.1A、20V6A
The charger is CCC certified.
The charger is equipped with fixed GB prongs.
The output is equipped with a single USB-C port.
The measured length of the charger body is 52.96mm.
The width is 33.92mm.
The thickness is 33.91mm. According to the three-dimensional calculation, the volume of the charger is about 60.92 cm³ and the power density is about 1.97 W/cm³.
Feel the size of the charger in your hand.
In addition, the weight of the charger was measured to be about 101g.
使用ChargerLAB POWER-Z KM003C测得充电器USB-C口支持UFCS、QC3.0、PD3.0、DCP充电协议。
PDO报文显示USB-C口还具备5V3A、9V3A、15V3A、20V3.25A四组固定电压档位,以及3.6-11V6.1A、3.6-20V4.8A两组小米私有快充档位。
测得UFCS融合快充支持5-11V3A、11-21V1.55A两组电压档位。
Use the Xiaomi 120W Pudding Charger to charge the Redmi Note 11T Pro+, and successfully turn on the 120W private fast charging.
Xiaomi 120W GaN Small Pudding Charger Teardown
After reading the appearance and test of the Xiaomi 120W small pudding gallium nitride charger, let's disassemble it and take a look at the internal scheme and workmanship.
First of all, remove the charger output housing, due to the internal potting filling, use a cutting machine to cut the shell, and take out the internal PCBA module.
Attach foam insulation to the inside of the back cover of the charger.
The PCBA module is crimped to the PCBA module for power supply through a shrapnel.
Graphite thermal adhesive is pasted inside the shell to enhance heat dissipation.
Close-up of graphite thermal pad inside the shell.
The charger PCBA module is filled with thermally conductive adhesive potting.
Paste the heat sink on the side of the PCBA module and paste the tape insulation.
On the other side is glued with aerogel insulation.
The length of the PCBA module measured by vernier calipers is about 49.3mm.
The width of the PCBA module is about 28.1mm.
The height of the PCBA module is about 28.6mm.
The PCBA module consists of two small plates welded, the bottom small plate welded rectifier tube and synchronous rectifier tube.
The side panels are equipped with heat sinks to dissipate heat from the GaN encapsulated chips.
Components such as high-voltage filter capacitors and transformers are welded inside the space enclosed by two PCBs.
Solder and remove the heat sink of the side plate, and the gallium nitride encapsulated chip is underneath.
Soldering split two PCBs, in which the left side is the switching power supply board, and the right side is the rectifier and output board.
Through the observation of the PCBA module, it is found that the Xiaomi 120W small pudding gallium nitride charger is a QR switching power supply architecture, synchronous rectification, a wide range of voltage output, the output voltage is fed back by the protocol chip through the optocoupler, and the gallium nitride fast charging source scheme comes from Jewalt. Let's start with the input to understand the information of each device.
List of PCBs at the bottom, input on the left, soldered fuse, thermistor, safety X2 capacitors, and two SMD Y capacitors. The right side is soldered with synchronous rectifier controller and USB-C receptacle.
Four rectifier diodes, SMD Y capacitors, SMD optocouplers, synchronous rectifier tubes, protocol chips and VBUS switch tubes are soldered on the back.
The front of the side plate is welded with high-voltage filter capacitors, differential mode inductors and transformers.
The output filter capacitor is welded inside the insulated frame of the transformer.
The back of the small board is soldered with a GaN sealed chip.
The input fuse is from Huade Electronics, and the specification is 3.15A 250V.
Thermistor silkscreen 3D7 for suppressing inrush current at power-up.
The other thermistor has the same specifications.
The safety X2 capacitor is from STE Matsuda Electronics and has a specification of 0.1μF.
The common mode inductor is made of magnetic surrounding, insulated by a heat shrinkable tube, and insulated by a bakelite board at the bottom.
The rectifier tube at the input end of the charger is from PY Pingwei, model RS4MBF, fast recovery rectifier tube, specification is 4A 1000V.
The high-voltage filter capacitors are from Dongjia, which are KZM series 125°C heat-resistant capacitors, two of which are 400V33μF.
The other is 400V 22μF with a total filter capacitor capacity of 88μF.
The differential mode inductor is made of magnetic surrounding, and the jacket is insulated by heat shrinkable tube.
The GaN encapsulated chip is from Jewalt, model JW1565J, this encapsulated chip encapsulates the high-frequency GaN direct drive controller and GaN power transistor in one package, reducing the impact of parasitic parameters on high-frequency switching, JW1565J integrates high-voltage start and X-capacitor discharge functions, and integrates 700V withstand voltage, 165mΩ GaN switch inside the chip.
The Jewalt JW1565J has a wide supply voltage range, QR operation mode to improve energy efficiency, and the chip has optional over-current and over-power protection for different PD and QC fast charging applications. The chip has ultra-low standby power consumption, has reliable and perfect protection functions, and adopts VDFN6*8-8L package.
Jewalt JW1565J Profile Information.
The transformer core is tightly wound and insulated with a plastic frame.
SMD Y capacitors come from Sichuan Teruixiang Technology Co., Ltd., which have the characteristics of small size and light weight, which are very suitable for high-density power products such as gallium nitride fast charging. The part number is TMY1151K.
Teruixiang focuses on the research and development, production and sales of passive components, with a registered capital of 100 million yuan. It has two categories of independent capacitor brands: SMD TRX and DIP TY capacitors, TRX will be committed to the research of ceramic materials, in order to expand more categories of applications, to provide customers with more solutions.
The charging head network learned that in addition to being used by dozens of high-power chargers such as Baseus Qualcomm QC5 certified 100W gallium nitride fast charging, Maiduoduo 100W gallium nitride, OPPO 65W super flash charging gallium nitride charger, Lenovo 90W gallium nitride fast charging, Nubia 65W gallium nitride charger, Baseus 120W gallium nitride + silicon carbide PD fast charging charger, etc., can also be applied to 20W mini fast charging of brands such as Hailutong, First Guard, Belkin, etc., and the performance has been unanimously recognized by customers.
LITE-ON LTV1008 optocouplers are used for output voltage feedback.
The other side of the small board is also welded with two SMD Y capacitors.
贴片Y电容料号为TMY1101K。
The synchronous rectifier controller is from Jewalt, silk screen JWJ9, the actual model is JW7726BH, the chip supports ACF, DCM, QR and CCM working modes, supports high-side and low-side applications. The chip supports direct power supply from the output voltage, has low quiescent current, has fast drive capability in CCM mode, and is available in a SOT23-6 package.
Jewalt JW7726BH information.
The synchronous rectifier is from Weizhao Semiconductor, model VSP003N10HS-G, NMOS, withstand voltage 100V, conduction resistance is 3.8mΩ, and it is packaged in PDFN5*6.
威兆半导体 VSP003N10HS-G 资料信息。
According to the dismantling of the charging head network, Weizhao MOS tubes are widely used in chargers, wireless charging, car charging, power banks, energy storage power supplies and other aspects, and have been used in dozens of products of well-known brands such as Huawei, Xiaomi, Zimi, Samsung, OPPO, VIVO, Meizu, Nubia, Baseus, Bull, NetEase Intelligent Manufacturing, etc., and the product quality has been unanimously recognized by customers.
The output filter capacitor is from Dongjia Electronics, which is a KW series 125°C heat-resistant solid-state capacitor with a specification of 25V680μF.
The protocol chip is customized by Xiaomi to Yingjixin, and the chip is silk-screened with the logos of the two brands of Xiaomi and Yingjixin, and the word C3 is also silk-screened.
The output VBUS switch is from PY Pingwei, model D50N03HL, NMOS, withstand voltage 30V, conduction resistance 3mΩ, and DFN3*3 package.
USB-C female spot welded steel sleeve, through hole welding fixed.
The USB-C receptacle has an orange tongue.
A list of all dismantling and a family photo.
Summary of the dismantling of the charging head network
Finally, a list of core components of the Xiaomi 120W small pudding charger is attached for your convenience.
The Xiaomi 120W small pudding charger continues the shell design of the previous generation of 67W small pudding, with a strip-shaped column shape and a unique style. The charger uses fixed national standard pins, supports 120W fast charging for Xiaomi mobile phones, and also supports 65W PD fast charging and 33W UFCS fast charging, and supports fast charging for laptops and other brands of Android mobile phones, with good overall compatibility.
Through the dismantling of the charging head network, it was found that the Xiaomi 120W small pudding charger adopts a potting process inside, and graphite thermal conductive stickers are pasted inside the shell to strengthen heat dissipation. The internal PCBA module is composed of two soldering pieces, which makes full use of the space, and arranges the rectifier tube, gallium nitride encapsulated chip and other components separately to evenly share the heat and reduce the temperature rise.
The GaN fast charging source scheme inside the charger comes from Jiehuat, using a JW1565J GaN encapsulated chip with a JW7726BH synchronous rectifier controller, the synchronous rectifier tube is from Weizhao Semiconductor, and the rectifier tube and VBUS switch are from Pingwei. The input and output filter capacitors are from Dongjia and are 125°C heat resistant. The inside of the charger is solid and the materials are reliable.