Recently, Charging Head Network noticed Lenovo Lenovo has a 65W PD fast charging charger manufactured by Kangshu Technology. It adopts the current mainstream square column design and has a power density as high as 1.02W/cm³, but it uses a conventional fast charging charger. recharge plan. There are very few cases where such a compact charger can be designed using conventional solutions, which makes the editor very curious. Now that we have got this product, let’s dismantle it in detail and take a look at the specific materials and workmanship.
1. Lenovo 65W charger appearance
The charger adopts a common square column design, with a smooth and white waist, rounded transitions between surfaces, and fixed national standard pins at the input end.
There are Lenovo brand and 65W power words on the diagonal corners of one side.
The charger parameters are marked on the input shell
Model: ADLX65UAGC2D
Input: 100-240V~50/60HZ 1.8A
Output: 5V3A, 9V3A, 15V3A, 20V3.25A, 65W Max
Manufacturer: Kangshu Technology Co., Ltd.
The product has passed CCC certification, China energy-saving certification and VI level energy efficiency certification.
The top USB-C port is located near the edge, and the yellow rubber core does not expose copper.
uses vernier caliper to measure the length of the charger body is 60.26mm.
width is 32.94mm.
thickness is 31.95mm. Through three-dimensional calculation, the volume of the charger is approximately 63.42cm³, and the power density is approximately 1.02W/cm³. An intuitive comparison between
and Apple’s 61W charger shows that the size advantage is very obvious.
The intuitive feeling of holding it in your hand. The net weight of
is about 97g.
Using ChargerLAB POWER-Z KT002, it was measured that the USB-C port supports Apple 2.4A, Samsung 5V2A, DCP protocols, as well as QC3.0, QC4+, PD3.0, and PPS fast charging protocols.
In addition, the PDO message display C port also has four sets of fixed voltage levels: 5V3A, 9V3A, 15V3A, 20V3.25A, and a set of PPS voltage levels of 5-20V3.25A.
2. Disassembly of Lenovo 65W charger
Disassemble the input housing and use black and white AC wires to connect and power on.
PCBA module wraps the isolation board and brass heat sink, and secures it with tape.
The heat sink is also soldered and fixed to the PCB board.
Remove the heat sink and isolation board. There are four thermal pads attached to the back of the motherboard, corresponding to the rectifier bridge , primary and secondary MOS tube and other major heating devices.
PCB board front view, the primary side common mode inductor, capacitor and transformer are also attached with thermal pads.
used a vernier caliper to measure the length of the motherboard to 56.4mm.
width is 27.38mm. The thickness of the
module is 26.91mm.
PCB board front view, four-stage layout design, the structure is very clear.
PCB board back view, there are two rectifier bridges, switching power supply main control chip and high-voltage switch tube, optocoupler , two SMD Y capacitors, synchronous rectifier tube and output VBUS switch tube. The entire periphery looks very simple .
After removing the large components on the front of the motherboard, we can find that some resistors, capacitors, and other small components are actually placed on the front, and there are also synchronous rectifier controller and protocol IC on the secondary side.
discovered through observation that Lenovo’s 65W PD fast charger uses a typical architecture of a switching power supply with wide range output and a protocol chip to control the output voltage. Let's learn about each component one by one starting from the input end.
The input end of the charger is equipped with a small plate, the common mode inductor on the left is also equipped with a plastic base, and a high-voltage filter electrolytic capacitor is placed horizontally in the middle, a single large-capacity solution.There are fuses and common mode inductors on the front of the
small board. There is a production date of July 2, 2020 on the board.
time delay fuse specification is 3.15A 250V.
common mode inductor is glued and reinforced, and is equipped with an isolation board.
Another common mode inductor is wound with flat copper tape and has a green core. A two-stage common mode inductor is designed at the input end to filter out EMI interference.
Safety regulations X capacitor sleeve has a circle of copper foil and is wrapped with insulating tape .
X capacitor close-up, capacity 0.33μF.
Chongqing Pingwei TMBFR310 rectifier bridge close-up, maximum operating temperature 150℃, maximum surge current 0A, two are set here to evenly distribute the heat.
Chongqing Pingwei TMBFR310 details.
high voltage filter electrolytic capacitors are from AiSHi. The specification of
is 400V 100μF. There is a transformer at the other end of
, and two solid capacitors are distributed on both sides.
charger main control chip is ON Semiconductor NCP1342, which is a high-frequency primary PWM controller with built-in active X2 capacitor discharge and multiple complete protection functions, with ultra-low standby power consumption.
Charging Head Network learned through disassembly that ON Semiconductor’s NCP1342 main control chip is used in mophie 65W 1A1C gallium nitride fast charge, Pinson 65W 2C1A gallium nitride fast charge, instant 65W 2C1A gallium nitride fast charge, and Red Magic mobile phones. 120W gallium nitride fast charge, flash 90W 2C1A gallium nitride fast charge, LG 65W gallium nitride charger, Xiaomi 20W super fast charge, iQOO 120W flash charger, etc.
silk screen 60C7185, which is actually Infineon IPL60R185C7, with a voltage resistance of 650V and a resistance of 185mΩ.
Infineon IPL60R185C7 data information.
transformer close-up.
008 optocoupler, used for primary and secondary communication, feedback adjustment of the output voltage.
Two SMD Y capacitors are from Sichuan Teruixiang Technology Co., Ltd. They have the characteristics of small size and light weight, and are very suitable for use in high-density power products such as gallium nitride fast charging.
Teruixiang focuses on the R&D, production and sales of passive components, with a registered capital of 100 million yuan. It has two types of independent capacitor brands: SMD TRX and DIP TY capacitors. TRX will be committed to the research of ceramic materials to expand more categories of applications and provide customers with more solutions.
Charging Head Network learned that Teruixiang SMD Y capacitors are not only used by Maiduoduo 00W gallium nitride, OPPO 65W super flash charging gallium nitride charger, Lenovo 90W gallium nitride fast charging, Nubia 65W gallium nitride In addition to using dozens of high-power chargers such as the charger and Baseus 20W gallium nitride + silicon carbide PD fast charging charger, it can also be used in 20W mini fast charging of brands such as Hailutong, First Guardian, Belkin and so on. , the performance has been unanimously recognized by customers.
The silk screen IAZEM secondary synchronous rectification controller is actually the MP6908 of MPS Core Source Semiconductor. It supports a wide output voltage range, supports DCM/CCM/quasi-resonance multiple operating modes, and supports high-side and low-side synchronous rectification.
MP6908 detailed specifications.
Charging Head Network learned that MPS MP6908 is also used in RedmiBook Pro 15 notebook standard 100W charger, IKEA 40W 2A1C desktop fast charging charger, Lenovo notebook 65W PD fast charging charger, Samsung 65W PD fast charging charger, flash Ji 100W 3C1A gallium nitride fast charging charger, Anker 65W PD fast charging, Xiaomi 65W GaN charger. In addition, MPS synchronous rectification chip is also used by Xiaomi 9 Pro original 45W fast charging charger, thinkplus 45W USB PD charger, Zimi Used in dozens of products including 65W 2C1A desktop PD fast charging charger.
synchronous rectifier uses ON Semiconductor FDMS86181, with a voltage resistance of 100V and a resistance of 4.2mΩ.
ON Semiconductor FDMS86181 data information.
The specifications of the two output filter solid capacitors are 25V 470μF. The
protocol chip uses Tongjia LD6612QM, which is highly integrated and can reduce external parts. It is a solution with overall cost and design size advantages.
LD6612 combines USB-PD baseband PHY, Type-C cable detection, shunt regulator, voltage and current monitoring, load switch NMOS control circuit and microcontroller . The chip's built-in voltage regulator allows the operating voltage to operate at 3V~24V. Protocol support: PD3.0, PPS, FCP/SCP, QC5/QC4+/QC3.0/QC2.0, Apple5V2.4A, BC1. 2 etc.
output VBUS switch tube uses Fuding AP4024EYT, NMOS tube, withstand voltage 30V and conduction resistance 4.5mΩ.
Fuding AP4024EYT data information.
Close-up of USB-C female socket, through-hole soldering.
is all disassembled, let’s take a family photo.
Charging head network disassembly summary
Lenovo's charger looks very simple against the white shell. It has the Lenovo brand and 65W power words on the waist, and the input end is equipped with fixed pins. In terms of performance, it supports QC3.0, QC4+, PD3.0, and PPS fast charging protocols, and has 5V3A, 9V3A, 15V3A, 20V3.25A, and 5-20V3.25A voltage levels to meet the fast charging needs of laptops and mobile phones.
Charging Head Network learned through disassembly that the charger PCBA module is planned very concisely and hierarchically. It uses ON Semiconductor NCP1342 with Infineon IPL60R185C7 high-voltage MOS, and MPS MP6908 with ON Semiconductor FDMS86181 synchronous rectifier to form a switching power supply. Through Tongjia The LD6612QM protocol chip controls the output voltage. One Aihua large-capacity capacitor is used for input filtering and two solid capacitors are used for output filtering. The overall materials used are also very solid.
