Introduction
We have obtained the original power adapter for Lenovo Legion laptops, with a maximum output power of 300W, manufactured by Delta Electronics. It supports an input voltage range of 100-240V AC and has an output specification of 20V 15A, providing a total output power of 300W. The output connector is a proprietary square-shaped design from Lenovo, which meets the power requirements of high-performance laptops. Below, we will take a closer look at the internal components and materials used in the Lenovo Legion laptop's original adapter.
Product Appearance
It comes in a black packaging box, featuring an image of the product and the Lenovo logo.
The back of the box features product information.
The packaging includes the power adapter, power cord, and user manual.
The adapter features a flat, compact body with a matte-finish shell.
The bottom of the adapter has an information label, and the four corners are fitted with anti-slip pads.
Power Adapter 300W 20V
Model: ADL300SDC3A
Input: 100-240V~4.5A 50-60Hz
Output: 20.0V⎓15.0A 300W
Manufacturer: Delta Electronics, Inc.
Manufacturing Date: July 2025
The input end is equipped with a three-prong connector.
The output cable is designed with anti-bend protection.
The output cable is equipped with a shielding ferrite core.
The length of the output cable is about 180 cm (70.87 inches).
The square connector features identification pins inside.
The length of the adapter is about 200.2 mm (7.88 inches).
The width is about 99.9 mm (3.93 inches).
The thickness is about 25.7 mm (1.012 inches).
The included power cord is secured with a bundling strap.
The power plug is rated for 10A 250V~.
The three-prong connector is also rated for 10A 250V~.
The length of the power cord is about 178 cm (70.079 inches).
That's how big it is on the hand.
The weight is about 868 g (30.62 oz).
The weight, including the power cord, is about 1036 g (36.54 oz).
Teardown
Next, let's take it apart to see its internal components and structure.
Peeling off the anti-slip pads on the four corners reveals screws inside.
After removing the screws and opening the casing, it is found that the housing is secured with ultrasonic welding.
The input wires are connected via welding, and the soldering points are insulated with heat-shrink tubing.
The output wires are also connected via welding, and the terminals are insulated with heat-shrink tubing.
The PCBA module is wrapped with a large aluminum alloy heatsink for heat dissipation.
The length of the PCBA module is about 191.8 mm (7.55 inches).
The width is about 93.9 mm (3.7 inches).
The thickness is about 21.2 mm (0.83 inches).
The heatsink is removed, and inside the aluminum plate, a copper sheet is installed. The corresponding heating components are bonded with thermal adhesive and equipped with thermal pads.
The thermal adhesive applied to the PCBA module serves both to reinforce the structure and enhance heat dissipation.
The back side of the PCBA, corresponding to the heating components, is also coated with thermal adhesive, allowing heat to be dissipated through the heatsink.
Remove the adhesive from both the front and back sides of the PCBA module. The front side includes a fuse, safety X2 capacitor, common mode choke, filter inductor, film capacitors, bridge rectifiers, PFC MOSFETs, LLC MOSFETs, PFC boost inductor, resonant inductor, resonant capacitors, LLC transformer, and filter capacitors.
The back side includes the PFC controller, PFC rectifiers, LLC controller, synchronous rectifier controller, synchronous rectifiers, op-amp, and output current sense resistors.
Remove the heatsinks from both sides.
Close-up of input socket.
The input fuse is from Chevron, with a rating of T10A250V.
The safety X2 capacitor is from HJC, with a rating of 0.47μF.
The common mode choke is wound with flat copper wire.
The bridge rectifiers are mounted on an L-shaped heat sink.
The bridge rectifier is from YJ, model D10JB80A, with a rating of 800V 10A, and features a JB package.
The other bridge rectifier has the same model.
The film capacitor is from HJC, with a rating of 1μF 450V.
The filter inductor is wound with enameled wire.
The film capacitors have a rating of 1μF 450V.
The PFC controller is a custom model from Delta, marked with DAP047T, and features an SO8 package.
The heat sink is equipped with PFC MOSFETs, secured by a clamping plate.
The PFC MOSFETs are from AOS, model AOW125A60, NMOS, with a voltage rating of 700V, a drain-source resistance of 108mΩ, and come in a TO-262 package. They are suitable for PFC, flyback, and LLC applications in switch-mode power supplies, as well as for micro-inverter applications.
Here is the information about AOS AOW125A60.
Two sampling resistors are connected in parallel to detect the current of the PFC MOSFETs.
The PFC boost inductor has a magnetic core wound with copper foil shielding.
It is equipped with a ferrite bead to suppress high-frequency interference.
The PFC rectifier is from RePower, model BYV10ED-600P, an ultra-fast recovery diode, with a rating of 600V 10A, and comes in a TO252N package.
The other PFC rectifier has the same model.
The bypass diode is from LITEON, model S5MB, with a rating of 1000V 5A, and comes in an SMB package.
The high-voltage filter capacitors are from AiSHi, part of the RH series, with a 105°C heat resistance rating.
One of the capacitors has a rating of 450V 120μF.
The other two filter capacitors have a rating of 450V 68μF, bringing the total capacitance of the filter capacitors to 256μF.
The LLC controller is a custom model from Delta, marked with DAP048T, and features an SO16 package.
The two diodes are from YJ, model ES1D, with a rating of 200V 1A, and come in an SMA package.
The filter capacitor powering the master control chip is from AiSHi, part of the RJ series, and is a long-life electrolytic capacitor.
The capacitor has a rating of 35V 220μF.
The resonant capacitors have a rating of 0.022μF 630V.
The resonant inductor is wound with litz wire.
The LLC MOSFETs are secured to the heat sink by a clamping plate.
The LLC MOSFETs are from Infineon, marked with 6R165P, model IPI60R165CP, NMOS, with a voltage rating of 650V, a drain-source resistance of 165mΩ, and come in a TO262 package.
The LLC transformer is wound with litz wire, has a magnetic core with copper foil shielding, and is insulated with a plastic casing.
The blue Y capacitor has the part number CT7471KB.
The Everlight EL1013 optocoupler is used for output voltage feedback.
The TEA1995T from NXP is a synchronous rectifier controller designed for LLC resonant converter applications. It features two integrated drivers for synchronous rectification, simplifying external component requirements. The device is housed in an SO8 package.
The synchronous rectifiers are from STMicro, marked with 140N6F7, model number STD140N6F7, NMOS, with a withstand voltage of 60V, an on-resistance of 3.8mΩ, and a DPAK package.
The output filter capacitor is from AiSHi and is a long-life electrolytic capacitor from the RZ series.
The capacitors are rated at 25V 470μF, and a total of 6 capacitors are used in parallel.
The Op-Amp is from LITEON, marked with B4310P, model LB4310. It integrates dual Op-Amps and a voltage reference for output voltage and output current control, and is packaged in an SOP-8 package.
Two 3mΩ resistors are connected in parallel for output current detection.
Well, those are all components of the Lenovo Legion 300W Original Adapter.
Summary of ChargerLAB
Here is the component list of the Lenovo Legion 300W Original Adapter for your convenience.
It supports an input range of 100-240V AC, with an output specification of 20V 15A. The input side is equipped with a three-prong connector and includes a 1.8-meter power cord. The output is designed with an integrated cable, featuring a proprietary square connector for Lenovo devices. The output cable length is approximately 1.8 meters.
After taking it apart, we found that it utilizes a PFC+LLC+SR high-efficiency architecture. The PFC controller is the Delta DAP047T, paired with the PAD048T LLC controller. The synchronous rectifier controller is the NXP TEA1995T. The PFC MOSFETs are AOS AOW125A60, and the PFC rectifiers are RePower BYV10ED-600P. The LLC MOSFETs are IPI60R162CP, while the synchronous rectifiers are STMicro STD140N6F7.
The unit uses AiSHi capacitors for high-voltage filtering and output filtering. The LITEON LB4310 op-amp is employed for output constant current and constant voltage control. All power components are equipped with heat sinks, and the PCBA module is wrapped with an aluminum alloy heat sink. The components are secured with thermal adhesive to enhance heat dissipation, ensuring the system meets the requirements for high-power, long-duration output.
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