December 4, 2022

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This power adapter is manufactured by Lite-On Technology, and the output specification is 20V 4.25A. The power supply comes with a storage cable management board, which can easily store the output cable. The power supply is also equipped with a folding plug and an input extension cable, which is suitable for portable and extended power supply. need. The following charging head network will disassemble this power adapter to see how the internal design and materials are.

Apple 85W MagSafe 2 Charger Out of the Box

The front of the box is printed with the Apple logo, the name of the 85W MagSafe 2 Power Adapter and the appearance diagram.

The package includes the charger, power cord and instruction manual.

One end of the attached power cord is a national standard three-pin pin, and the other end is a plug that connects to the adapter. Both ends are treated with anti-bending.

The measured cable length is about 185cm.

The charger is designed in a classic square shape, with smooth edges and corners of the shell, and the magnetic connector with its own output cable is also a candy bar shape in the MagSafe 2 series.

The charger model is A1424, which is manufactured by Lite-On Technology Co., Ltd.

In addition, it supports 100-240V~50/60Hz 1.5A input and 20V4.25A output, and has passed CCC, KC safety certification and VI energy efficiency certification.

The charger comes with a detachable pin module, equipped with folding national standard pins, and a double-wing design is added on both sides to improve stability.

The output cable is protected against bending, and there are cable management boards on both sides of the fuselage.

The output cable can be wound and organized through two small plates.

The magnetic suction line head is made of metal material, in addition, there is an indicator light, and the end is covered with a plastic shell.

Close-up of the end of the wire, with five contacts in the groove.

The measured length of the charger body is 80.08mm.

The width is 80.01mm.

The thickness is 28.71mm.

The output cable length is about 175cm.

The weight of the charger with pins is about 322g.

Apple 85W MagSafe 2 Charger Teardown

After reading the appearance of Apple’s 85W MagSafe 2 power adapter, let’s disassemble the adapter to see how the interior is designed.

Disassemble the case along the seam of the power case, the inner PCBA module wraps the pure copper heat sink, and glues it to the case to enhance heat dissipation.

The entire charger PCBA module is wrapped with a pure copper heat sink to dissipate heat and wrapped with tape to fix it.

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There is tape insulation between the pure copper heat sink and the components.

The heat sink is soldered to the PCBA module.

The AC input is connected by welding with cold-pressed terminals of white and black wires, and a magnetic ring is used to suppress high-frequency interference.

The output wire of the charger is cold-pressed and insulated with a heat-shrinkable tube, and is soldered to the PCBA module.

Using a vernier caliper, the length of the PCBA module is about 70.1mm.

The width of the PCBA module is about 74.7mm.

The thickness of the PCBA module is about 25.07mm.

Remove the pure copper heat sink covered by the PCBA module and continue the disassembly.

The front of the PCBA module is at a glance, the internal components are glued and fixed, the PFC switch tube, the primary switch tube and the synchronous rectifier tube are all screwed to fix the aluminum heat sink.

The synchronous rectifier tube also has fixed aluminum heat sinks for heat dissipation.

A gray rubber pad is pasted on the back of the PCBA module for support.

Remove the two heat sinks, and clean off the glue and thermal pads from the circuit board, and start looking at the PCBA module.

The front view of the PCBA module, the lower left corner is the input fuse, the varistor, the EMI circuit and the rectifier bridge, the bottom is the filter inductor and filter capacitor, the top is the PFC boost inductor, the right side is the high-voltage filter electrolytic capacitor, and the top of the electrolytic capacitor is the switch. Transformer, top is synchronous rectifier tube and output filter capacitor. Between the capacitor and the transformer is a small board for secondary monitoring.

Multiple chips and feedback optocouplers are welded on the back of the PCBA module, which are respectively used for primary switching power supply and output control, and the optocoupler is used for protection and voltage feedback functions.

Through the observation of the power adapter circuit, it is found that the Apple 85W MagSafe 2 charger adopts the PFC+ flyback switching power supply architecture, and the fixed voltage output powers the notebook. PFC switch tube, primary switch tube and secondary synchronous rectifier tube are all fixed with heat sink to reduce temperature rise. Let’s start from the input side to understand the device information of the power supply.

Weld varistors, fuses, safety X2 capacitors, common mode inductors, rectifier bridges and other devices at the power input end.

The input fuse specification is 3.15A 250V, which is soldered under the blue safety X2 capacitor for input overcurrent protection.

The varistor is connected behind the fuse and in parallel with the X2 safety capacitor for input overvoltage protection.

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The blue safety X2 capacitor is from HJC Huarong with a capacity of 0.22μF.

The common mode inductor is made of magnetic surround, and the interior is insulated with bakelite and fixed with glue.

Weld the rectifier bridge, film filter capacitor, filter inductor, PFC boost switch tube and primary switch tube on the side of the power supply.

The rectifier bridge is from LT Lite-On, model KBP208GL, which is used to rectify alternating current into pulsating direct current.

The two thin-film filter capacitors are from Nichitong, and the specifications are both 0.68μF.

The filter inductor is made of magnetic surround, and the insulating bracket is fixed by glue.

The primary main control chip of the power adapter is screen printed LTA910N, which is a customized model. The chip has a built-in PFC and flyback controller.

The PFC boost switch tube is from Infineon, silk screen 6R299P, the actual model is IPA60R299CP, it is a CoolMOS with a withstand voltage of 650V, the conduction resistance is 299mΩ, and it is packaged in TO220FP.

The PFC boost inductor is tightly wound with tape for insulation.

PFC boost rectifier tube screen printing MUR460 is an ultra-fast recovery diode, and the pins are sleeved with magnetic rings to suppress high-frequency interference.

High-voltage filter capacitors are from Guimi Gong, KXG series long-life capacitors, with a specification of 420V 82μF.

The primary switch tube is fixed with screws and heat sinks to increase the heat dissipation area.

Teardown report: Apple Apple 85W MagSafe 2 Charger A1424

The primary switch tube is from Infineon, silk screen 11N80C3, the actual model is SPA11N80C3, NMOS, withstand voltage 800V, conductance resistance 0.45Ω, using TO220FP insulation package, which helps to simplify the internal heat dissipation design of the power supply.

Teardown report: Apple Apple 85W MagSafe 2 Charger A1424

Sampling resistor used to detect primary switch tube current, sheathed with heat shrinkable tube for insulation.

Teardown report: Apple Apple 85W MagSafe 2 Charger A1424

Two electrolytic capacitors are used to power the primary controller, the capacitors are from ruby, and the specification is 50V22μF.

Teardown report: Apple Apple 85W MagSafe 2 Charger A1424

Weld the synchronous rectifier tube corresponding to the secondary side of the transformer.

Teardown report: Apple Apple 85W MagSafe 2 Charger A1424

Close-up of a switching transformer with magnetic core wound with tape for insulation.

Teardown report: Apple Apple 85W MagSafe 2 Charger A1424

Close-up of three blue Y capacitors.

Teardown report: Apple Apple 85W MagSafe 2 Charger A1424

Four optocouplers are used for output voltage feedback and power supply protection control functions.

Teardown report: Apple Apple 85W MagSafe 2 Charger A1424

NXP NXP TEA1762, integrated synchronous rectification controller and feedback control for synchronous rectification drive and output voltage feedback control.

Teardown report: Apple Apple 85W MagSafe 2 Charger A1424

The synchronous rectifier is from Infineon, silk screen 086N10N, the actual model is IPA068N10N3 G, it is an NMOS in a TO220FP package, with a withstand voltage of 100V and a conduction resistance of 8.6mΩ.

Teardown report: Apple Apple 85W MagSafe 2 Charger A1424

Solder two filter capacitors, a small board, output fuse and Y capacitor at the output end.

Teardown report: Apple Apple 85W MagSafe 2 Charger A1424

An output filter capacitor is from Guimi Gong, KZH series low resistance capacitor, the specification is 25V 680μF.

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Teardown report: Apple Apple 85W MagSafe 2 Charger A1424

The other output filter capacitor is from Ruby, ZLJ series long-life capacitors, which have the advantage of high ripple current, and the specification is 25V 470μF.

Teardown report: Apple Apple 85W MagSafe 2 Charger A1424

A 10mΩ resistor is used to sense the output current.

Teardown report: Apple Apple 85W MagSafe 2 Charger A1424

Three chips are soldered on the front of the small board.

Teardown report: Apple Apple 85W MagSafe 2 Charger A1424

A larger chip silk screen M430V343.

Teardown report: Apple Apple 85W MagSafe 2 Charger A1424

A voltage comparator silkscreen AJK, the actual model is TLV3402, from TI Texas Instruments, is a micro-power dual voltage comparator.

Teardown report: Apple Apple 85W MagSafe 2 Charger A1424

A voltage regulator chip silk screen AQI, from TI Texas Instruments, the actual model is TPS71533, supports 24V input voltage, used to power the chip on the small board.

Teardown report: Apple Apple 85W MagSafe 2 Charger A1424

Two chips are soldered on the back of the small board.

Teardown report: Apple Apple 85W MagSafe 2 Charger A1424

One of the chips is silk-screened BHF 19E5.

Teardown report: Apple Apple 85W MagSafe 2 Charger A1424

Another chip silk screen OCFQ, from TI Texas Instruments, the actual model is OPA330, is a single-channel micro-power zero-drift operational amplifier.

Teardown report: Apple Apple 85W MagSafe 2 Charger A1424

Remove the in-line components on the circuit board, leaving a MOS tube and a chip fuse.

Teardown report: Apple Apple 85W MagSafe 2 Charger A1424

The switch tube that controls the output is from Toshiba, model TPC8118, which is a PMOS with a withstand voltage of 30V, with a conduction resistance of 5.5mΩ, and is packaged in SO8.

Teardown report: Apple Apple 85W MagSafe 2 Charger A1424

The power output passes through a fuse for overcurrent protection, and the fuse specification is 4.8A.

Teardown report: Apple Apple 85W MagSafe 2 Charger A1424

After all the dismantling is completed, let’s take a family photo.

Disassembly summary of charging head network

The Apple 85W MagSafe 2 power adapter is designed with a cable integrated, with a special magnetic plug, designed for notebook charging. There is a cable management card on the adapter shell, which is convenient for storing output cables and easy to carry. The package comes with a foldable plug and a 1.8-meter long AC power cord, and the magnetic suction output line is 1.8 meters long, which can be flexibly selected according to the use situation and is convenient to use.

The charging head network learned through disassembly that the Apple 85W magnetic power adapter has a built-in PFC+ flyback switching power supply with a fixed voltage output. The PCBA module is packaged with a pure copper heat sink for heat dissipation, and the switch tube uses an aluminum heat sink for heat dissipation. Solder a small board on the output side, solder the op amp and voltage comparator, and use a fuse for output overcurrent protection.

The power adapter is manufactured by LITE-ON, and the PFC switch tube, primary switch tube, and secondary synchronous rectifier tube are all from Infineon. The internal switch tubes of the charger are all fixed with heat sinks, and the internal capacitors are made of Japanese guimi Gong and ruby. The materials used are all from well-known manufacturers in the industry, and the overall workmanship is solid and the quality is reliable.