This charger adopts the family design of Apple chargers. It uses traditional replaceable folding pins and can also be used with extension cords. It is more convenient to use at home or outside. The following is a description of this 35W dual-port charger. Take a teardown and see how the interior is designed.
Apple 35W dual port charger out of the box
The front of the box is printed with the Apple logo, the name of the charger and the appearance diagram.
The name of the charger in multiple languages and a diagram of its use are printed on the back.
There is a charger parameter sticker on the side.
The other side is affixed with a product production date sticker, made in China. Except for the appearance of the front charger, the other design of the box is the same as that of the previously dismantled A2579.
The package contains the charger and instruction manual.
The Apple A2676 charger is designed with a classic square shape, with a white glossy shell and rounded corners.
The pins are designed as detachable independent modules, and two wings are added on both sides to improve the stability of use.
Equipped with foldable national standard pins, it is easy to carry and will not scratch other equipment in the bag.
After the pin module is removed, there is a T-shaped fixing seat on the body to help fix it, and it can also play a grounding role (the power cord with grounding pins needs to be replaced).
A warning is printed on the casing next to the T-shaped fixing seat.
The 2.5A 250V~ specification, Longwell manufacturer and CHN are printed on the pin module shell.
The charger parameter information is printed on the side of the fuselage.
Charger parameters close-up
Model: A2676
Input: 100-240V~50/60HZ 1A
PD output 1 or 2: 5V3A, 9V3A, 15V2.33A, 20V1.75A
Maximum output total power: 35W Max
Manufacturer: Flextronics Power (Dongguan) Co., Ltd.
The charger has passed CCC, KC certification, and VI energy efficiency certification.
The output is equipped with dual USB-C ports and white rubber cores.
The measured height of the charger body is 56.06mm.
The width is 56.01mm.
The thickness is 28.59mm.
Compared with Apple’s 30W charger, the two are about the same size.
Intuitive feeling of the size in the hand.
Net weight is about 116g.
Using ChargerLAB POWER-Z KT002, the USB-C1 port supports Apple2.4A, Samsung 5V2A, DCP protocol, and PD3.0 fast charging protocol.
The PDO message shows that the C1 port has four sets of fixed voltage levels: 5V3A, 9V3A, 15V2.33A, and 20V1.75A.
It is measured that the compatible protocol of the USB-C2 port is the same as that of the C1 port.
The PDO messages are exactly the same, and the single-port output performance of the two USB-C interfaces is exactly the same.
The dual ports are output at the same time, and the measured PDO messages of the two ports are 5V3A, 9V1.94A, 15V1.16A, 20V0.87A four groups of fixed voltage gears.
use appleMacBookThe serial number of the charger read by the Pro is C4H2237027P1VHGAY.
The serial number of the charger measured by ChargerLAB POWER-Z MF001 is also C4H2237027P1VHGAY.
Using this charger to charge the Apple MacBook, the measured charging power is 19.95V 1.68A 33.46W.
It was used to charge the Apple iPhone 13 Pro Max, and the measured charging power was 8.94V 2.93A 26.18W.
Use it to charge both Apple iPhone 13 Pro and iPhone 13 Pro Max at the same timecell phone, the measured power is around 16.5W, which supports intelligent power distribution and uninterrupted power.
Another mobile phone charging power at a glance.
Using the charger to charge the iPhone and the earphone at the same time, the measured charging power of the earphone is about 1.7W.
The charging power of the iPhone 13 Pro Max phone is about 26.05W.
Apple 35W dual port charger dismantling
After reading the unboxing and testing of this charger, let’s disassemble it and see how the interior is designed.
First use a cutter to cut the charger case along the seam of the case.
The internal capacitor of the charger and the PCB board are covered with a thermally conductive silicone cover to fill the internal space.
A graphite thermal paste is pasted inside the shell for heat dissipation.
Take out the PCBA module from the inside of the casing, and the bottom of the PCBA module is also filled with a silicone pad that fits the shape.
In addition, a graphite thermal paste is also pasted inside the shell to dissipate heat.
The PCBA module is divided into an AC power supply part and a DC step-down part, wherein the DC step-down module is insulated by a separate plastic shell.
The DC step-down module is completely insulated by a plastic case.
Using a vernier caliper to measure the length of the PCBA module is about 49.19mm.
The width is about 49.01mm.
The thickness is about 23.59mm.
The power input adopts the cold-pressed terminal of the wire, which is protected by a heat-shrinkable tube, and is connected to the PCBA module by welding.
The grounding wire is fixed on the T-type fixed terminal with screws. When used with a three-phase extension wire, the charger can be grounded to prevent numbness.
The T-type fixed terminal uses screws to fix the ground wire, and the other end is welded to the DC step-down module.
The front of the PCBA module is at a glance. Apple’s 35W dual-port charger adopts a secondary step-down circuit design. The output of the transformer is directly welded to the step-down small board, and the small board is synchronously rectified and filtered to supply power to the step-down circuit.
The rectifier bridge and primary switch tube of the AC power supply can be seen on the back of the small board.
Remove the silicone cover and insulating cover covered on the charger PCBA module for detailed disassembly.
Through the observation of the charger, Apple’s 35W dual-port charger adopts the method of switching power supply and two-way step-down circuit, and the output voltage of the step-down chip is controlled by the protocol chip, which meets the design method of dual-port simultaneous fast charging output. The secondary output of the transformer is directly connected to the output small board, and the small board performs synchronous rectification and step-down output.
A list of the AC input terminals of the charger. The fuse at the input terminal is fixed on the top of the bracket. The left side is the safety X2 capacitor, and the right side is the common mode inductor. The three-dimensional arrangement makes full use of the internal space.
The fuse jacket is insulated with heat shrink tubing.
The fuse is fixed on the insulating bracket with tape, the safety X2 capacitor is in the space on the left side of the bracket, and a common mode inductor is on the right side.
Safety X2 capacitor capacity is 0.1μF.
The input rectifier bridge comes from LITE-ON, silk screen RTT10KL, which rectifies the alternating current into pulsating direct current.
The three high-voltage filter capacitors are from Fengbin, the specification is 22μF 400V, and the total capacity is 66μF.
The differential mode inductor adopts an I-shaped magnetic core and cooperates with three electrolytic capacitors to filter the pulsating DC power output by the rectifier bridge into DC power to supply power for the switching power supply. Electrolytic capacitors and differential mode inductors are insulated with a one-piece silicone cover. Differential mode inductors have no jacket heat shrink tube and wrapping tape for insulation.
The silicone cover accommodates three electrolytic capacitors and common mode inductors.
Remove the plug-in components on the front of the AC power supply PCBA module, and weld a main control chip and a switch tube on the front.
The primary main control chip of the charger adopts Apple’s customized controller, silk screen APSLC01, which is used inside Apple’s new 30W charger and 96W charger.
A switch tube is from ST, silk screen 16EPF6N2.
The screen-printed 5001 transformer is used for primary current detection, eliminating the power loss caused by traditional sampling resistors.
The primary switch tube is from AOS Bandai, the silk screen is 180A60, and the actual model is AONV180A60. It is an NMOS with a withstand voltage of 700V, a conduction resistance of 160mΩ, and is packaged in DFN8*8.
A switch tube is from ST, silk screen 65PF6N2.
The transformer is insulated with tape wound.
The electrolytic capacitor for powering the primary main control chip, the specification is 35V 47μF.
The silicone cover of the transformer and the electrolytic capacitor jacket plays an insulating role.
Solder a small board next to the transformer for output voltage feedback. The output small board is connected by welding under the small board, and an insulating plastic cover is fixed on the back.
Below the plastic cover are safety Y capacitors and feedback optocouplers.
Close-up of the black safety Y capacitor.
EL1014 optocoupler is used for output voltage feedback.
Below the Mylar sheet pasted on the small board is a QR code.
The other Y capacitor is fixed with a plastic insulating bracket.
The output step-down board is welded with two inductors and filter capacitors, respectively corresponding to two synchronous step-down circuits for step-down output.
The plastic shell is pasted on the back of the small board to insulate the primary element.
A piece of copper foil is attached inside the shell, and the copper foil is grounded through the conductive cloth pasted on the PCB.
Conductive cloth to connect the copper foil on the back.
The front of the small board is welded with two step-down inductors, two USB-C sockets and a protocol chip, and four solid capacitors are used for input and output filtering.
The synchronous rectifier tube is welded on the left side of the back of the small board, two VBUS switch tubes are in the middle, two dual MOS tubes on the right are used for synchronous step-down, and the two on the far right are synchronous step-down controllers, which are controlled by the protocol chip to adjust the output voltage.
Synchronous rectifier controller silkscreen TEV.
The synchronous rectifier is from Infineon, silk screen 093N15NS, the actual model is BSC093N15NS5, it is an NMOS with a withstand voltage of 150V, the conduction resistance is 9.3mΩ, and it is packaged in SuperSO8.
The filter capacitor is from Nichicon, FP series solid capacitor, 270μF 25V.
The protocol chip comes from Infineon, model CYPD4236-LQXQT, which belongs to the EZ-PD CCG4 series. It is a protocol chip that supports dual-port fast charging applications and provides two complete USB PD interface applications, which can be used for notebooks, adapters and docking stations. application. EZ-PD CCG4 adopts Cypress’s proprietary M0S8 technology, built-in 32-bit ARM M0 processor, has 128KB flash memory and 8KB memory, and adopts 6*6mm 40pin QFN package, with white hard glue reinforcement on the edge of the pad.
The synchronous buck controller comes from MPS, model MP9928. It is a current mode synchronous buck controller that supports 60V input. It integrates a half-bridge NMOS driver inside. The operating frequency is 100kHz-1MHz programmable, and it supports phase inversion output and cycle-by-cycle Current protection, with output overvoltage protection function and high precision overheat protection function.
Two MP9928 synchronous step-down controllers are used for the step-down output of the two interfaces respectively.
The synchronous buck switch is from ON Semiconductor, model FDMC007N30D. It is a dual NMOS transistor with asymmetric structure and a half-bridge connection inside, which is suitable for synchronous buck applications. The withstand voltage of the two internal MOS tubes is 30V, the conduction resistance of the upper tube of the step-down is 11.6mΩ, and the conduction resistance of the lower tube is 6.4mΩ.
The step-down MOS tube of the other channel is of the same type.
Close-up of MLCC used for power supply filtering, five parallel.
The 6R8 alloy inductor is used with the step-down circuit for output step-down.
Another step-down inductor.
Solid-state capacitors for synchronous rectification input filtering, Nichicon FP5K series, 100μF 25V.
The two output filter capacitors are also of the same specification.
The two output VBUS switches are from AOS Bandai, the model is AON7428, which is a NMOS with a withstand voltage of 30V, a conduction resistance of 2.3mΩ, and a DFN3.3*3.3 package.
A close-up of the output USB-C female socket, which is combined with the shell structure to form a complete USB-C socket.
The USB-C female housing inside the housing is an independent module.
After all the dismantling is completed, let’s take a family photo.
Disassembly summary of charging head network
Apple’s new 35W dual-port charger adopts a traditional family-style design and is comparable in size to a 30W charger. The single port of the charger supports 35W power output, and supports automatic power distribution to meet the simultaneous charging needs of mobile phones and laptops. The USB-C port has four sets of fixed voltage gears, 5V3A, 9V3A, 15V2.33A, and 20V1.75A. When the second device is connected, the previously connected device will not be powered off, which improves the user experience.
The charging head network learned through disassembly that this 35W dual-port interior is insulated with multiple plastic parts and a silicone cover, which not only provides insulation protection, but also conducts heat to the shell for dissipation, improving the heat dissipation performance of the charger. The charger uses Apple’s custom APSLC01 main control chip, which is combined with ST and AOS switch tubes to form a switching power supply.
The output of the transformer is synchronously rectified, and the two MP9928s are controlled by Infineon CYPD4236 for synchronous rectification and step-down. The synchronous step-down tube is from ON Semiconductor, and the asymmetric structure is more suitable for step-down applications. The primary filter capacitor of the charger is from Fengbin, and the output solid capacitor is from Nichicon. The materials used for the whole machine are the first-line brands in the industry. The design and materials of the charger are very powerful.
