Recently, the charging head network obtained a Lapo 65W USB PD gallium nitride fast charger. This product adopts a "tofu block" square shape design. It is not only small in size and easy to carry, but also has a complete voltage gear and supports PPS.
It is worth mentioning that this charger is also equipped with multiple laptop charging connectors. In addition to directly PD fast charging of USB-C interface laptops, it can also charge traditional interface laptops. Such a charger can charge most of the new and old interface thin and light laptops on the market, which is very practical. Let’s disassemble this charger to see how it is made of materials.
Lapo charger packaging box is colorful, with two-style charger appearance pictures printed on the front center, Lapo brand and 2-year warranty logo printed on the upper end, and the product name printed on the lower end.
packaging box adopts a flip-shaped design, with gallium nitride and product characteristics description printed inside. The corresponding charger part has a window to facilitate users to observe the product entity, and the product name and conversion head logo are printed below. The back of
contains information such as charger specifications and packaging content.
Internal plastic box has multiple grooves for placing charger, data cable and five laptop charging connectors.
package contains a charger, USB-C to USB-C data cable, USB-C to 5521 charging adapter and five laptop charging connectors.
USB-C to 5521 charging adapter cable is tied with magic ties, 1.2m long, the surface of the wire body is smooth, and both ends are resistant to bending.
DELL charging connector.
LenovoLenovo Square port wire connector.
The other three charging connectors are designed with bent shapes, and the plugs are yellow, green and black injection molded to distinguish them, with different colors and sizes. The yellow charging connector supports Panasonic, HP, Toshiba, Acer, AUSU Asus and Lenovo Lenovo laptop chargers; the green supports NEC and Toshiba laptops; and the black supports Sony and Fujitsu laptops.
Lapo 65W gallium nitride charger adopts a square rounded corner design, similar to "tofu blocks". The body surface is matte, the edges and corners are round and not harsh. It is matched with foldable pins, making the product look very small and easy to carry. At the same time, in the wall insertion scenario, the center of gravity of the structure is close to the wall, the self-gravity moment is small, and the stability is better after insertion.
The Lapo brand is printed on the front and back of the body, and the design is simple.
input terminal uses foldable American-regulated pins, which are easy to carry and do not easily scratch other electronic products in the bag.
output end is equipped with a USB-C interface, the black rubber core does not reveal copper, and there is an indicator light next to it.
product parameter information marked on adjacent sides Model: WT-565C Input: 100-240V~50/60HZ 1.6A Output: Normal: 5V2.4APD Output: 9V3A, 15V3A, 20V3.25AQC3.0/QC2.0: 5V3A, 9V2A, 12V3A Maximum output power: 65W Product has passed FCC certification, CE certification and PSE certification. Compared with the size of
and Apple 61W charger, the size advantage of this Lapo is very obvious. Compared with the size of
and Apple 30W charger, Lapo is a little smaller, and the advantages of gallium nitride are fully reflected.
thickness is larger than the diameter of a one-yuan coin.
net weight is about 102g.
uses ChargerLAB POWER-Z KT001 to detect the output protocol of the USB-C port, and it shows that it supports Apple 2.4A and DCP protocols, as well as multiple fast charging protocols such as QC2.0/3.0, AFC and FCP.
In addition, its PDO message shows that the USB-C interface also supports USB PD3.0 fast charging standard, with five sets of fixed voltage gears, 5V2.4A, 9V3A, 12V3A, 15V4A, and 20V3.25A, and two sets of PPS voltage gears.
2. Lapo 65W gallium nitride charger disassembles
Remove the input shell, the edge of the body is packaged with ultrasonic welding, and the pins are fixed with plastic plates and screws.
pin ends are opened for a list, and AC wires and metal shrapnel are welded.
Take out the PCB board , and heat conduction pads are pasted on the upper and lower sides of the board, and tape is pasted to fix it. The overall list of
PCB boards are soldered on the main control circuit board, which are used to place components such as capacitor inductors and USB-C motherboards to make full use of the internal space to reduce the volume. In addition, the glue is added to the gap between the boards to enhance the internal stability and heat dissipation performance of the charger.
PCB back side, there are two rectifier bridges in the upper left corner of the board and glue to conduct heat. The lower left corner is PWM main control chip and high voltage MOS, and the white optocoupler spans between the primary and secondary levels.
After observing and analyzing the charger circuit, it was found that the Lapo 65W USB PD gallium nitride fast charger adopts a typical switching power supply wide range output, and the protocol controls the output voltage. Let’s start from the input to understand each component one by one.
PCB board front end list, fuse, secondary common mode inductor and X capacitor are soldered on the side PCB board, and four high-voltage filtered electrolytic capacitors are two black soldered on the main control PCB board.
input end white fuse close-up, rated current 3.15A.
Two-stage common mode inductor dual-wire winding is used to filter out EMI interference.
Another common mode inductor close-up.
safety gauge X capacitance capacity is 0.22μF.
I-shaped inductor jacket heat shrink tube.
input end uses two TMBF310 rectifier bridges to rectify, which is used to evenly spread the heat and reduce the temperature rise.
Two black high-voltage filtered electrolytic capacitors come from Yongming, and the specifications are both 400V and 22μF. The side of the
PCB board is listed at a glance, and the other two high-voltage filter electrolytic capacitors are welded onto the small PCB board to make full use of the internal space. Next to it is a transformer, and the synchronous rectifier tube uses a brass radiator to dissipate heat.
The two high-voltage capacitors are also from Yongming, with specifications of 400V 22μF and 400V 33μF respectively.
high voltage electrolytic capacitor family portrait, four are connected in parallel and a total of 99μF.
main control chip is ON ON Semi NCP1342, which is a high-frequency primary PWM controller with built-in active X2 capacitor discharge and multiple complete protection functions.
ON Semi NCP1342 Detailed information.
charging head network learned through disassembly that the gallium nitride charger that uses the ON Semi NCP1342 main control chip on the primary side also has SlimQ 65W gallium nitride USB PD fast charger, Pinsheng 65W USB PD gallium nitride charger, Aifukaiwu 2C1A 65W PD gallium nitride charger and Bes 65W 2C1A GaN gallium nitride charger and other products.
InnoGaN INN650D02 "InnoGaN" switch tube, with a pressure resistance of 650V, and a resistance as low as 0.2Ω, complies with the industrial application requirements of JEDEC standards. INN650D02 "InnoGaN" switch tube has good high-frequency characteristics and small on-resistance, which is suitable for high-frequency and efficient switching power supply applications. It is packaged in DFN8*8 and has ultra-low thermal resistance and good heat dissipation performance. It is suitable for switching power supply applications with high power density.
InnoSecco revealed to the Charging Head Network that the INN650D02 "InnoGaN" switch tube is based on the industry-leading 8-inch production and processing technology. It is currently the first mass-produced advanced process gallium nitride power device on the market. The large-scale commercialization of this technology will promote the rapid popularization of gallium nitride fast charging.
Innosecko INN650D02 Detailed information.
transformer is wrapped with marathon tape, and the top code has information.
PCB board is soldered vertically on the other side of the PCB board, and the middle of the board is empty, which seems to allow more interfaces to be added.
CT 1018 optocoupler, spanning between primary and secondary, is used for primary secondary communication, and feedback output voltage.
output anti-interference blue Y capacitor close-up, from JNC Jianai Electronics Co., Ltd.
silk screen IBHJK secondary synchronous rectifier controller, actual model is MP6908A, from MPS core source semiconductor, maximum operating frequency 600KHz.
MPS MP6908A detailed specification parameters.
charging head network disassembled and learned that the use of MPS MP6908A is also the Besie 65W 2C1A GaN GaN GaN Charger, AiFuKaiwu 1A2C 65W PD GaN Charger and RAVPOWER 65W GaN Charger. In addition, the MPS synchronous rectifier chip is also used by dozens of products such as Xiaomi 9 Pro original 45W fast charging charger, thinkplus 45W USB PD charger, thinkplus 65W lipstick USB PD charger, Zimi 65W 2C1A desktop PD fast charging charger, Google Pixelbook original 45W USB PD fast charging charger, etc.
mSecondary Synchronous Rectification MOS tube of
htmlAOS, model AONS62922, NMOS, with a voltage withstand voltage of 120V, optimized for synchronous rectification. The front of the MOS tube is equipped with thermal conductivity glue to fix the heat sink and the large area of vias at the corresponding position on the back of the board.AOS AON62922 detailed specifications.
PCB board output ends at a glance, two solid capacitors next to the transformer are welded side by side, USB-C mother seat is welded on the protocol board, and there is an LED indicator light next to it.
The output filtered solid-state capacitor specifications of the two cloud stars are the same, both 25V 470μF. The "YX" brand solid-state capacitor is specially designed for USB PD fast charging. It can still guarantee a life of 2,000 hours in a working environment of 105℃. It also has high temperature resistance, large ripple resistance, and low ESR resistance.
protocol small board is soldered on the front of the board, model F75183A, from Fintek Jingtuo Technology. This chip supports Qualcomm QC 4.0/4.0+ fast charging; it also supports USB PD2.0/3.0 (PPS).
fine-tuning F75183A detailed information.
is soldered on the back with a USB-C interface output VBUS switch.
output VBUS switch model is ZM045N03M, NMOS, with a voltage withstand voltage of 30V, from Zhenmaojia Semiconductor.
ZM045N03M specification information.
USB-C mother seat via welding, the shell is printed with the words KRCONN, from Shenzhen Jingrui Xingye Technology Co., Ltd.
has been disassembled, let’s take a family photo.
charging head network disassembly summary
charging head network learned through disassembly that the Lapo 65W USB PD gallium nitride fast charger adopts a typical architecture of wide range of switching power supplies, and a protocol to control the output voltage. The AC-DC part of the charger is composed of ON Semi NCP1342 with INN650D02 gallium nitride power device, and synchronous rectification controller MP6908A with AOS Bandai MOS; finally, the output is controlled by the Jingtuo USB PD protocol chip F75183A.
This charger has a compact internal structure and uses three additional small PCB boards, which has high space utilization. In addition, small boards and transformers and other components are glued and reinforced, and major heating chips such as rectifier bridges are also glued to help conduct heat, and the internal stability and heat dissipation performance are guaranteed. In addition, Yongming high-voltage electrolytic capacitor and Yunxing low-voltage solid-state capacitor are used for filtering, and the materials are solid.
The USB-C output interface of the last charger supports QC2.0/3.0, AFC, FCP fast charging protocols and USB PD3.0 fast charging standards, and has 5/9/12/15/20V and PPS voltage gears. It is equipped with multiple charging adapters, which can meet the charging needs of most new and old thin and light laptops. It is multi-purpose and is very practical.
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