With its small and portable advantages, gallium nitride chargers quickly conquered the majority of consumers once they were launched, quickly replacing traditional PD chargers and becoming the new favorite of consumers. In the field of notebook power adapters, there are also many adapters that use gallium nitride devices.
These adapters take advantage of the performance advantages of GaN devices, changing the traditional impression of laptop power supplies to becoming slimmer, thinner, lighter, and easier to carry. At the same time, the conversion efficiency is improved, the temperature rise is lower, and the service life is longer. The following charging head network summarizes the disassembled laptop power supply using gallium nitride devices, and looks at the internal design together.
The Dell 90W GaN Fast Charger features the family's typical flat body design with a power cord and an additional USB-A port. The product supports PD fast charging, with 5V3A, 9V3A, 15V3A, 20V45A four sets of voltage ranges, supporting 90W and 10W output at the same time, can charge two devices such as laptop and mobile phone at the same time.
Through the dismantling of the charging head network, it was learned that the AC-DC part of Dell's charger is composed of onsemi NCP1937 combination controller with Navitas NV6117 gallium nitride power chip, and Xinyuan Semiconductor MP6908A with Bandai AOD296A to form a synchronous rectifier switching power supply with APFC. The output voltage is controlled by Dell's self-developed protocol chip DPD021P. The chips are all from well-known manufacturers in the industry, and the materials are solid.
The inside of the charger is covered with two large pure copper heat sinks for overall heat dissipation, and some components such as rectifier bridges are also equipped with special heat sinks and graphite thermal conductive stickers to help heat dissipation, in addition to a large number of glue on the front and back of the PCB board to enhance internal stability and thermal conductivity. Capacitors, inductors, etc. are wrapped with insulating tape, and the details are exquisite.
Related reading: 1. Dell, a major notebook manufacturer, entered the GaN fast charging market, and the first 90W PD multi-port charger was disassembled!
Dell's notebook power adapter is designed with its own output cable, and it comes with 18m long USB-C output cable, support Dell 28V 585a 165w，20v 6.5A 130W proprietary protocol and supports 140W PD31 Specification. Not only can it meet the power supply needs of Dell graphics workstations, but it can also meet the power supply needs of other notebooks. The adapter is powered by a Torx connector and is equipped with a power indicator.
Through the dismantling of the charging head network, it was learned that Dell's notebook power adapter uses active rectification, using NXP TEA2206T controller with Fuding advanced MOS. The adapter uses PFC+HFB topology, the PFC controller uses TEA19162, the Infineon IGLD60R070D1 gallium nitride switch is used, and the Yangjie ultrafast recovery diode is used for rectification.
The HFB controller is from Infineon and is a customized model. The synchronous rectifier controller uses MPS MP6951, and the protocol chip adopts Weiquan WT6676F. The internal capacitor of the adapter comes from Wanyu and Kingsoft brands, the PCBA module is filled with glue as a whole, and the PCBA module is wrapped with an aluminum heat sink to increase the heat dissipation area. The adapter optimizes the heat dissipation performance for long-term high-power output scenarios such as laptop charging, and reduces the temperature rise of long-term output.
Related reading: 1. Teardown report: Dell Dell 165W PD31 GaN power adapter.
Lenovo's 100W power adapter has a white body, fixed national standard pins, and comes with 18 meters of output cable to meet the needs of daily use. The output cable of the adapter is a USB-C interface, which supports 100W output, and supports charging and powering laptops with USB-C interface. Because the charger has a built-in GaN device, it is significantly smaller and more portable than traditional chargers.
Through dismantling, the charging head network learned that this power adapter adopts PFC+ flyback switching power supply architecture, PFC uses NXP TEA19162 controller with Infineon IPL60R125P7 switch tube, and the flyback controller is from Richtek Technology, with Transphorm TP65H150G4LSG gallium nitride switch tube.
The synchronous rectifier controller is from MPS MP6908A, the synchronous rectifier tube is from onsemi, model FDMS86181, and the protocol chip adopts Weiquan WT6633P. The internal high-voltage capacitor of the power adapter comes from Aihua, and the output is filtered using solid-state capacitors. The PCBA module is wrapped with copper sheets for heat dissipation, and glued and filled to improve heat dissipation performance, and the internal workmanship and materials are very good.
The LG 65W GaN power adapter has a classic design and simple style, which can be said to be very typical as a laptop adapter. As a gallium nitride charger, the brick body has its own USB-C output cable, which is a bit "alternative". In terms of performance, PD3 is supported0 fast charging, with 5V3A, 9V3A, 15V3A, 20V3There are four sets of voltage ranges of 25A, which can meet the daily fast charging needs of laptops.
Through the dismantling of the charging head network, it was learned that the switching power supply of the charger is composed of onsemi NCP1342 with Navitas NV6125 gallium nitride power switch, and MPS MP6908A with Bandai synchronous rectifier tube, and the output protocol chip adopts Weiquan WT6636F certified chip, and the external thermistor is overheated protection. In addition, the charger uses large-capacity capacitors for input and output filtering, and all of them are from Taiwan's Guankun, and the internal area is filled with thermal conductive glue, and the overall materials are solid and reliable.
Related reading: 1. Built-in nano gallium nitride solution, South Korean LG laptops are equipped with 65W chargers as standard.
The LG Gram laptop comes standard with a 65W PD gallium nitride charger with a classic design and a simple style. As an included charger, the design of the cable that comes with it is also normal. The charger output supports PD30 fast charging, with 5V3A, 9V3A, 15V3A, 20V3There are four sets of voltage ranges of 25A, which can meet the daily fast charging needs of laptops.
Through the dismantling of the charging head network, it was learned that this charger was produced by Shenzhen Oulutong Electronics Co., Ltd. The switching power supply of the charger is composed of onsemi NCP1342 with Navitas NV6125 gallium nitride power switch, and MPS MP6908A with Bandai synchronous rectifier tube, and the output protocol chip adopts WT6636F certified chip, and the external thermistor is overheated protection. The inside is all made of Guankun capacitors, and the inside of the charger is filled with a large amount of thermal conductive glue, and the overall materials are solid and reliable.
Related reading: 1. Dismantling report: LG gram notebook original 65W gallium nitride adapter (European version).
Compared with traditional silicon devices, gallium nitride has a higher switching frequency, lower switching losses, supports higher switching frequency, and can reduce the size of the transformer core. The low switching loss reduces the heat dissipation requirements of the adapter, eliminating the need for a large heatsink and ensuring full power operation for long periods of time.
By summarizing the article, it can be found that the current mainstream brand laptop brands, the original self-wired power adapter has gradually turned to gallium nitride devices, through the application of gallium nitride devices in the power adapter, the volume of the power adapter can be significantly reduced, and the weight can be reduced, and the consumer experience can be improved.