The charging head network purchased LA170 GaN charger launched by Lenovo, which is a black square body with fixed national standard pins.This charger supports 100-240Vac input voltage, of which the maximum output power when 110V input is 135W, and the maximum output power when 220V input is unlocked is 170W.
Lenovo's special USB-C to square port cable is included in the package, which supports 170W output. With USB-C cable, the maximum output power of the charger is 140W.High efficiency AHB architecture is adopted inside the charger to improve conversion efficiency and reduce heat generation.Here is the disassembly of Lenovo's 170W GaN charger, and let's take a look at the internal solutions and materials.
Lenovo Saver 170W GaN Charger Unpacked
The front of the packaging box is printed with Lenovo, LEGION brand, bilingual product name and appearance. The overall design of the packaging appearance is the same as that of the previous generation savior 140W PD3.1 GaN fast charging charger.
The bottom of the box is printed with product selling points, parameters and business information.
A close-up of the parameters of the packing box is introduced below in combination with the actual objects.
The package includes the charger, data cable and user manual.
The attached cable is C to slim cable, commonly known as square port cable, and the pins inside the terminal are gold-plated.
The USB-C terminal housing at the other end is sanded, and the LEGION brand is also designed.
The measured length of the square mouth line is about 152.5cm.
useChargerLAB POWER-Z KM003CIt is measured that the cable is equipped with an E-Marker chip, which supports Lenovo 170W fast charging.
The design language of the Savior 170W GaN Charger is roughly the same as that of the previous generation. The bright surface of the shell is sanded and color contrasted, and the shape is sharp, but the actual holding edge does not hurt the hand.
The area below the front of the fuselage is designed as the LEGION brand through frosted contrast.
170W power words are designed on the back.
There are multiple frosted diagonal stripe spacing designs in the side bright area, which is also a big difference in the appearance of this new product.
The input end is equipped with a fixed national standard pin, which is arranged on one side for easy plugging.
The shell of the input terminal is also bright and has detailed parameter information of the charger.
Close up of charger parameters
Model: LA170
Input: 100-127V~50/60Hz 2.5A
Output: 5/9/12/15V3A, 20V6.75A (135W Max)
Input: 200-240V~50/60Hz 2.5A
Output: 5/9/12/15V3A, 20V7A, 20V8.5A
140W Max(C-C)
170W Max(C-Slim)
Manufacturer: Lenovo (Beijing) Co., Ltd
The charger has passed CCC certification and Class VI energy efficiency certification.
The output end is equipped with a single USB-C interface.
The USB-C port is designed with 170W and lightning fast charging logo.
The measured height of the charger body is 70.96mm.
The width is 70.95mm.
The thickness is 31.13mm.The volume of the charger is about 156.73cm ³, and the power density is about 1.08W/cm ³.
Compared with Apple's 140W charger, it not only has a larger output power, but also has obvious size advantages.
The size of the charger is intuitive.
In addition, the measured net weight of the charger is about 250g.
Using ChargeLAB POWER-Z KM003C, it is measured that the USB-C interface supports QC3+/5, PD3.0, PPS, DCP and Apple 2.4A charging protocols.
PDO message shows that USB-C port has six groups of fixed voltage gears: 5V3A, 9V3A, 12V3A, 15V3A, 19.5V5A, 20V6.75A, and 5-21V5A one group of PPS voltage gears.
Use this charger to charge Lenovo laptop, and the measured power is about 20.58V 7.69A 158.21W.
Disassembly of Lenovo Saver 170W GaN Charger
After seeing the appearance and test of Lenovo's GaN charger, we will disassemble it and take a look at the internal scheme and materials.
First, pry off the shell along the shell seam, and the fixed pins are connected by welding wires.
Draw out the internal PCBA module and cover the copper plate for heat dissipation.
The length of PCBA module measured with vernier caliper is about 67.4mm.
The width of PCBA module is about 64.9mm.
The thickness of PCBA module is about 26.2mm.
The front and back fins of PCBA module are connected by welding.
Remove the heat sink wrapping the PCBA module, glue the transformer and other heating elements to enhance heat dissipation, and set a heat conduction pad on the back of the corresponding PCB.
Mylar sheet is used for insulation between the heat sink and the heat conduction pad.
At the front of the PCBA module, the filter panel is welded at the lower left corner, and the safety gauge X2 capacitor and common mode inductance are welded on the panel.Lower welding fuse and common mode inductance.The right side is welded with a rectifier bridge, and a heat sink is arranged on the rectifier bridge.The lower right corner is the PFC boost inductor, and the upper part is the high-voltage filter capacitor.The switch transformer is welded at the upper left corner, the filter capacitor plate is welded at the upper right corner, and the USB-C mother seat plate is welded at the right side.
At the back of PCBA module, PFC controller, PFC switch tube and PFC rectifier tube are welded at the upper right corner.The lower left corner is welded with AHB controller and half bridge GaN chip, as well as patch Y capacitor and feedback optocoupler.The lower right corner is welded with synchronous rectifier controller and synchronous rectifier tube, patch Y capacitor and feedback optocoupler, VBUS switch tube, and the other side is welded with protocol chip.
Through observation, it is found that Lenovo's 170W GaN charger uses PFC+AHB switching power supply architecture design. PFC performs power factor correction, AHB switching power supply performs wide voltage output, and finally the protocol chip controls the output voltage of the interface through optocoupler feedback. The internal use of nano micro GaN switches and Italian semiconductor GaN half bridge chips.Now let's start from the input to understand the information of each device.
List of PCBA module input terminals, welding fuse, common mode inductance, safety gauge X2 capacitor.Welding transformer and electrolytic capacitor on the left side.
The input fuse is from Huade Electronics, and the specification is 5A250V.
The common mode inductance is wound with enameled wire and insulated wire, and the bottom is welded with insulated support.
The EMI small board, filter capacitor and filter inductor are welded on the side, and the PFC boost inductor is on the right.
The safety regulation X2 capacitor is from KNSCHA Konisheng, and the specification is 0.47 μ F.
A common mode inductor is also welded on the front of the small board.
There are no welding elements on the back of the small board.
The common mode inductance is wound with flat copper wire, and the insulation support is welded at the bottom.
Rectifier bridge is from Yangjie Technology, with model of GBU810 and specification of 8A 1000V.
The film filter capacitor is MPB series shell mounted film capacitor from KNSCHA Konyson, with the specification of 1 μ F450V.
Magnetic loop winding is adopted for filter inductance.
The PFC controller at the input end adopts Silijie SY5072B, silk screen d9, operates in the critical mode, adopts constant on time operation, and the built-in boost converter adopts quasi resonant switch, which is turned on at the bottom to obtain high efficiency and optimize EMI performance.
PFC switch tube is from nano micro, model NV6136C, which is a highly integrated GaN power chip, with built-in driver and high-precision lossless current sampling circuit to eliminate the loss of sampling resistance.The NV6136C has a built-in 170m Ω conduction resistance, 700V withstand voltage GaN switch tube, supports 2MHz switching frequency, and uses 6 * 8mm QFN packaging to save area.
The side of PCBA module is welded with PFC boost inductor, high voltage filter capacitor, USB-C bus base small board and output filter capacitor small board.
Close up of PFC boost inductance, magnetic core winding tape insulation.
PFC switch tube is from MHCHXM HiSilicon, model SFN06ACS.
GS3MB diode is used for PFC bypass.
Two high-voltage filter capacitors are from emerald, and the specification is 420V39 μ F.
The specification of the other filter capacitor is 420V22 μ F, and the total filter capacitor capacity is 100 μ F.
AHB controller is an asymmetric half bridge flyback controller from Jewart, model JW1556B, which is packaged with QFN 4x4-20 and suitable for offline flyback converter applications.The input voltage range is 2.5-38V, and the maximum operating frequency is 1.5MHz. It supports 65-300W fast charging applications.JW1556B is a model that optimizes the peak output power for laptop use. It supports 1-2 times the peak power and is suitable for laptop adapter use.
JW1556B works in ZVS mode under heavy load, supports adaptive ZVS switch, and achieves efficiency optimization.Working in DCM mode under light load, it can provide two-way output control of main power switch and auxiliary switch, and support functions such as high-voltage startup, X capacitor discharge, burst mode control, adjustable line compensation, etc.
The filter capacitor supplied by the main control chip is from Aihua, and the specification is 50V100 μ F.
The half bridge GaN device comes from ST STP Semiconductors, model MASTERGAN4. It is internally integrated with two 650V withstand voltage GaN switches with a resistance of 225m Ω. It is connected by half bridge. The chip is internally integrated with a driver, which can be controlled by inputting logic signals. It is simple to use.9 * 9mm QFN package is adopted, which is suitable for half bridge resonant switching power supply applications.
The resonant capacitance specification is 0.47 μ F450V.
The side of PCBA module is welded with transformer, and the left side is welded with output filter capacitor board.
The transformer core is wrapped with copper foil for shielding, and the output adopts multi-layer insulated wires.
The transformer core is insulated with plastic shell.
The SMD Y capacitor comes from Sichuan Teruixiang Technology Co., Ltd., which has the characteristics of small size and light weight, and is very suitable for use in high-density power products such as GaN fast charging.The part number is TMY1101K.
Teruixiang focuses on the R&D, production and sales of passive components, with a registered capital of 100 million yuan.It has two independent capacitor brands: SMD TRX and DIP TY capacitors. TRX will devote itself to the research of ceramic materials to expand the application of more categories and provide customers with more solutions.
The material number of the other patch Y capacitor is TMY1471K.
Guangbao LTV1008 optocoupler is used for output voltage feedback regulation.
The other LTV1008 optocoupler is used for PFC switch control.
The synchronous rectifier controller is JW7726BL, from Jewart. It is a synchronous rectifier controller supporting ACF, DCM, CCM, QR, AHB and other topologies, supporting high side and low side applications.Compared with the traditional Schottky diode, it can significantly improve the efficiency.JW7726BL is directly powered by the output voltage and has fast driving capability. It is used in CCM operation mode and is packaged with SOT23-6.
Information of JW7726BL.
Two synchronous rectifier tubes are from Toshiba, model TPH4R50ANH1, NMOS, withstand voltage 100V, conductivity 3.7m Ω, and are packaged by SOP Advance.
Six filter capacitors are welded on the small board. The filter capacitors are from emerald, and the specification is 680 μ F25V.
There are no welding elements on the back of the small board.
The protocol chip is from Huinengtai.Model HUSB362 is a high-performance PD protocol chip that supports PD3.1 EPR and integrates 32-bit RISC-V MCU. It has 32 KB MTP memory and supports multiple PDOs with programmable voltage and current, such as PPS PDO and EPR PDO. All PDOs fully comply with USB PD 3.1 V1.7 specification.HUSB362 has passed the PD3.1 compliance test of USB-IF Association, and the EPR TID is 9692.
VBUS switch tube comes from Fuding Advanced, model AP3NR68CDT, NMOS, withstand voltage 30V, conductivity 0.68m Ω, and is packaged with PDFN5 * 6.
The USB-C mother seat is welded on the vertical small plate, and the corresponding data line is equipped with TVS diode for electrostatic protection.
There are no welding elements on the back of the small board.
The USB-C mother seat is fixed by via welding, and the black tongue does not expose copper.
After all disassembly, let's have a family photo.
Disassembly summary of charging head network
Finally, the list of core components of Lenovo 170W GaN charger is attached for your reference.
The Lenovo 170W GaN Charger has a black body and fixed pins. It is suitable for carrying with the computer inside the interlayer of the computer bag. Compared with the traditional large charger, it is lighter, smaller and has a better carrying experience.The charger is a single USB-C output interface, which supports 140W fast charging output for the notebook with USB-C cable, and also supports 170W fast charging output for the notebook with its own adapter cable.The USB-C port also supports PPS fast charging, which can charge mobile phones and laptops of other brands.
Through disassembly, the charging head network learned that the Lenovo 170W Gallium Nitride Charger PCBA module was completely wrapped with brass heat sink, filled with heat conduction adhesive, and pasted with heat conduction pad to enhance the heat dissipation effect.PFC+AHB architecture is adopted inside the charger, and the PFC adopts the Silijie SY5072B controller with the Nano NV6136C GaN power chip.AHB adopts Jewart JW1556B with Italian semiconductor MASTERGAN4 gallium nitride half bridge chip.
The synchronous rectification adopts Jewart JW7726BL synchronous rectification controller with two Toshiba TPH4R50ANH1 synchronous rectification tubes, and the protocol chip adopts Huinengtai HUSB362.The charger uses emerald high-voltage electrolytic capacitor and solid capacitor filter inside, and the small PCB board is vertically welded inside, which is compact in structure and makes full use of space.The internal materials and workmanship of the charger are solid and reliable.