Although the official price of these two chargers is 399 yuan, they are also equipped with dual C ports and have the same output performance, but the appearance design is very different. In addition to the intuitive and different impressions of the innovative “jelly” shape and the classic block shape, there are still many people who wonder if there are other differences, or which one to choose when buying.
The following charging head network makes a detailed comparison of these two Apple chargers, so that you can understand more of their differences.
Product appearance packaging
Apple A2579 and A2676 two charger boxes are basically the same except for the appearance of the front charger, including the product name, model, production date, etc.
Exterior
The top surface and side of the Apple A2579 charger is an integrated white bright surface shell, and the bottom is a gray shell. The overall shape is like a “jelly”, and the flat cut surface design at the bottom can fit well with wall plugs or power sockets, and is stable in use.
The Apple A2676 charger is designed in a classic square shape. The corners of the bright surface shell are rounded and it is also equipped with folding pins, but it is a classic detachable independent module design. In order to improve stability, two wings are added on both sides.
Size/Power Density
The three-dimensional measurement of the Apple A2579 charger is 49.4*49.38*28.01mm, and the power density is about 0.51W/cm³; the three-dimensional measurement of the Apple A2676 charger is 56.06*56.01*28.59mm, and the power density is about 0.39W/cm³. Through data comparison, we can also find that the second charger is slightly larger.
interface
Both Apple A2579 and A2676 chargers are equipped with dual USB-C ports, but if you look closely, you can find that the ports are different. The USB-C socket of the A2676 charger comes with an independent shell, which is also a major feature of Apple’s classic chargers. feature.
nameplate
The Apple A2579 charger nameplate is printed on the gray shell at the bottom, and the A2676 charger nameplate is printed on the side. Although the input and output parameters are the same, the A2579 charger is manufactured by Salcomp Technology (Shenzhen) Co., Ltd., and the A2676 charger is manufactured by Flextronics ( Dongguan) Co., Ltd. OEM.
Apple A2579 charger parameters:
Model: A2579
Input: 100-240V~50/60HZ 1A
PD output 1 or 2: 5V3A, 9V3A, 15V2.33A, 20V1.75A
Maximum output total power: 35W Max
Manufacturer: Salcomp Technology (Shenzhen) Co., Ltd.
Manufacturer: Salcom Technology (Shenzhen) Co., Ltd.
The charger has passed CCC certification and VI level energy efficiency certification.
Apple A2676 charger parameters:
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.
weight
The net weight of the Apple A2579 charger is about 104g, and the net weight of the A2676 charger is about 116g.
Front layout of internal structure
The Apple A2579 charger is a dual-channel independent power supply design, corresponding to two independent transformers and output filter capacitors. The input terminal is powered by a connector, which meets Apple’s design for multi-country plugs. Only one PCBA module can meet the requirements of all parts of the world. Production of power supplies without redesign.
The Apple A2676 charger PCBA module is divided into an AC power supply part and a DC step-down part. The ground wire is fixed on the T-type fixed terminal with screws. The output of the transformer is directly welded to the step-down small board. After synchronous rectification and filtering on the small board, the voltage drop Voltage circuit power supply, additionally insulated with a separate plastic case.
back layout
There is a synchronous rectifier tube on the back of the Apple A2579 charger motherboard, and the VBUS switch tube and primary components are all symmetrically configured. There is a rectifier bridge and a primary switch tube on the back of the Apple A2676 charger motherboard.
Primary controller for work materials
The two-way switching power supply main control chips of the Apple A2579 charger are all from PI, and the silk screen ZN1431C is a customized model for Apple. The chip integrates primary controller, high-voltage switch tube, synchronous rectification controller and feedback function, with high integration, simplified peripheral devices, and simplified design of fast charging source circuit.
The primary main control chip of Apple A2676 charger adopts Apple’s customized controller, silk screen APSLC01, which is used in Apple’s new 30W charger and 96W charger.
Synchronous Rectifier Controller
The Apple A2579 charger synchronous rectifier controller is integrated in the PI main control chip, and the Apple A2676 charger synchronous rectifier controller screen prints TEV.
Protocol chip
Apple’s A2579 and A2676 charger protocol chips both use Infineon’s CYPD4236-LQXQT, which belongs to the EZ-PD CCG4 series. The edge of the latter pad is reinforced with white hard glue.
This protocol chip supports dual-port fast charging applications and provides two complete USB PD interface applications, which can be used in notebook, adapter and docking station applications. EZ-PD CCG4 adopts Cypress’s proprietary M0S8 technology, built-in 32-bit ARM M0 processor, with 128KB flash memory and 8KB memory, using 6*6mm 40pin QFN package,
Primary switch tube
The Apple A2579 charger high-voltage switch is integrated in the PI main control chip, and the Apple A2676 charger’s high-voltage switch adopts AOS AONV180A60, which is a NMOS with a withstand voltage of 700V, a conduction resistance of 160mΩ, and a DFN8*8 package.
Synchronous Rectifier
The synchronous rectifier tube of Apple A2579 charger adopts AOS AONS62920, which is an NMOS with a withstand voltage of 100V, a conduction resistance of 6.3mΩ, and a DFN5*6 package. The Apple A2676 charger synchronous rectifier tube adopts Infineon BSC093N15NS5, which is a NMOS with a withstand voltage of 150V, a conduction resistance of 9.3mΩ, and a SuperSO8 package.
capacitance
The Apple A2579 charger uses three electrolytic capacitors for filtering, two of which are 400V 22μF from AiSHi. Another filter electrolytic capacitor is from CapXon Fengbin, the specification is 10μF 400V. The Apple A2676 charger is filtered by three CapXon Fengbin electrolytic capacitors, all of which are 22μF 400V.
The Apple A2579 charger uses two Fengbin solid capacitors for synchronous rectification and output filtering. It is a PS series conductive polymer capacitor with a heat resistance of 105°C and a specification of 560μF 25V. The Apple A2676 charger uses Nichicon FP series solid capacitors for output filtering, 270μF 25V.
Synchronous Buck Controller
Another big difference between the Apple A2676 charger and the A2579 is that the output has two synchronous buck circuits. The synchronous buck controller adopts MPS MP9928, which is a current mode synchronous buck controller that supports 60V input. Half-bridge NMOS driver, programmable operating frequency of 100kHz-1MHz, supports phase inversion output, supports cycle-by-cycle overcurrent protection, has output overvoltage protection function and high-precision overheat protection function.
Synchronous Buck Switch
The Apple A2676 charger synchronous buck switch adopts ON Semiconductor FDMC007N30D, which 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.
Product Performance Agreement
Using ChargerLAB POWER-Z KT002 to measure Apple A2579 and A2676 chargers C1 and C2 interfaces support Apple2.4A, Samsung 5V2A, DCP, PD3.0 charging protocols.
The comparison chart of the other C port test protocol of the two chargers.
PDO
It is measured that the single-port output PDO messages of the C1 and C2 interfaces of the Apple A2579 and A2676 chargers are also the same. Both have 5V3A, 9V3A, 15V2.33A, 20V1.75A four sets of fixed voltage gears, support power blind insertion and intelligent distribution.
A comparison chart of the other C port PDO messages of the two chargers.
Summary of charging head network
Finally, a comparison table of these two Apple chargers is attached, so that you can compare the differences between the two products.
The two 35W dual-C port chargers of Apple A2579 and A2676 can be intuitively understood from the name that they are equipped with dual USB-C ports and support up to 35W fast charging output. The actual measurement is compatible with the same protocols such as Apple2.4A and PD3.0, and has 5V3A , 9V3A, 15V2.33A, 20V1.75A four groups of the same voltage gear, support intelligent power distribution.
The two chargers have many similarities and many differences. First of all, the appearance is very different, one is a novel “jelly” shape design, and the other is a classic block shape. Secondly, the internal circuit design and the use of devices are also very different. The A2579 charger adopts a two-way switching power supply circuit design, while the A2676 charger adopts a single switching power supply plus two-way DC-DC step-down circuit design, but the devices are all from PI , MPS, Infineon, ON Semiconductor and other international manufacturers.
It is worth mentioning that many filter capacitors of the two chargers are used in the products of two major domestic manufacturers, Aihua and Fengbin. It can be seen that after years of development, the quality of domestic capacitors has made great progress, such as Aihua and Fengbin. The product quality of the first-line manufacturers has even reached the international first-class level and is trustworthy.
It is mentioned at the beginning that the official price of these two Apple chargers is 399 yuan, the product performance is the same, and the quality is absolutely guaranteed, so you can choose which one you prefer.
