Faced with the fact that many Apple iPhones no longer have standard chargers, hundreds of third-party brands have launched 20W chargers to fill the huge market gap. Recently, Shenzhen Shanmok Digital Technology Co., Ltd. also launched a 20W fast charging charger. The product has a very classic shape. In terms of performance, in addition to supporting the fast charging of iPhone 12, it can also be compatible with many mainstream charging protocols on the market. The charging head network will disassemble this charger in detail to see how its design and workmanship are.
1、 Appearance of Shanmok 20W charger
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This 20W charger is made of PC flame-retardant white shell, and the waist piano is painted. The transition between the sides is smooth. The front center of the body is equipped with SMARTDEVIL brand, which is simple in design.
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Charger parameter information is marked on the input housing
Model: FJ-SW618HG20C
Input: 100-240V~50/60Hz 0.6A
Output: 5V3A, 9V2.22A, 12V1.67A
Supervisor: Shenzhen Shanmo Digital Technology Co., Ltd
Manufacturer: Huizhou Fujia Electrical Technology Co., Ltd
The product has passed 3C certification.
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In addition, it is equipped with fixed national standard pins.
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The output top surface is concave, and the center is equipped with a USB-C interface. The black rubber core does not expose copper.
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The measured length of charger body with vernier caliper is 48.74mm.
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The width is 45.11mm.
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The thickness is 25.5mm.
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Compared with the size of Apple 20W charger, the Shanmon charger is wider and flatter.
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The intuitive feeling of holding it in the hand.
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The net weight of the charger is about 53g.
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use ChargerLAB POWER-Z KT002 The USB-C port output protocol is detected, and the display supports Apple 2.4A, Samsung 5V2A, DCP protocols, as well as QC2.0/3.0, AFC, FCP, SCP, PE2.0, and PD3.0 fast charging protocols.
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In addition, PDO message shows that USB-C interface also has three sets of fixed voltage gears: 5V3A, 9V2.22A and 12V1.67A.
2、 Disassembly of Shanmok 20W charger
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Disassemble the shell of the input end, and contact the pins with the metal sheet to power on.
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Both sides of the fuselage shell are provided with grooves to fix the PCB board.
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The front of the PCB board is at a glance. Components such as transformers and capacitors are glued and fixed. Isolation boards are set between the primary stages. The USB-C mother seat is vertically welded using protocol small boards.
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The back of the PCB board is at a glance. The back is equipped with a rectifier bridge, a master chip, an optocoupler and a secondary synchronous rectifier chip. A hollow slot is set between the primary stages to place the isolation board.
Through the observation of PCB circuit, it is found that the Shanmok 20W PD fast charging charger uses a typical architecture of switching power supply with wide range output, and the protocol chip controls the output voltage through optocoupler feedback. Now let's start from the input end to understand each component.
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List the input terminals, and glue and fix the components.
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The specification of delay fuse is 2A 250V.
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NTC surge suppression resistor is used to suppress power on surge current.
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Close up of ABS210 rectifier bridge.
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The side of PCB board is equipped with I-shaped inductance and two high-voltage filter electrolytic capacitors.
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H-shaped inductor is protected by heat shrink tube.
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One high-voltage filter electrolytic capacitor is from Chengxing, with the specification of 400V 15 μ F。
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The other one is from Okap, and the specification is also 400V 15 μ F。
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List the other side of PCB board.
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The power supply capacitor specification of PWM master chip is 50V 10 μ F。
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Close up of PWM main control chip, screen printed 2393BN.
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Close up of MOS tube of primary switch, screen printed 4N70DS.
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Close up of transformer with information sticker on the top.
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Yiguang EL 357N optocoupler, spanning between primary stages, is used for primary secondary communication and feedback output voltage.
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List of output terminals.
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Close up of anti-interference blue Y capacitor.
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The high-performance secondary side synchronous rectification driver chip LP20R100S of Shimao Microelectronics is suitable for synchronous rectification applications of AC-DC, forward excitation system and flyback system. In addition, it supports multiple working modes of DCM, BCM, QR, and CCM, withstands 100V, and integrates VCC power supply in the chip.
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Information of Xinmao Micro LP20R100S.
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Synchronous rectifier output filter electrolytic capacitor from Chengxing, specification 16V 330 μ F。
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Synchronous rectifier output filter solid capacitor from Yubang, specification 16V 680 μ F。
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The front of the small output board is equipped with a protocol chip and a USB Type-C female seat.
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The other side is equipped with output VBUS switch tube and output current sampling resistance.
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USB PD protocol chip adopts English chip IP2723T. The chip has passed the USB IF Association PD3.0 PPS certification, and is a fast charging protocol IC that integrates multiple protocols and is used for USB output ports. It supports a variety of fast charging protocols, including USB TypeC DFP, PD2.0/3.0, PPS, HVDCP QC4, QC4+, QC3.0/2.0, FCP, SCP, AFC, MTK PE+2.0/1.1, Apple 2.4A, BC1.2, and Samsung 2.0A. Provide a complete TYPE-C solution for one-way output applications such as adapters and car chargers.
In addition, IP2723T has a high degree of integration and rich functions, requiring only a few peripheral devices in application, effectively reducing the size of the overall scheme and reducing BOM costs.
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Yingjixin IP2723T data information.
After disassembling the charging head network, we learned that the products with Yingjixin IP2723T are Maiduoduo 20W mini PD quick charge 、 Huakelong 20W PD fast charging charger 、 Momex 65W 2C1A Gallium Nitride Fast Charging Charger 、 Nubia 65W USB PD GaN Charger 、 Nubia 1A1C 45W deuterium front gallium nitride fast charger In addition, Yingjixin fast charging chip can also be used in various charging fields such as car charging, mobile power supply, adapter, etc millet 、 Jingdong Jingzao 、 Huawei 、 Samsung 、 Tesla And other well-known brands More than 100 products adopt 。
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Close up of output VBUS switch tube, core cell PED3016M, withstand voltage 30V, suitable for DC converter and other applications.
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Details of core cell PED3016M.
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Close up of USB-C mother seat, via welding, black rubber core without copper exposed.
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After all disassembly, let's have a family photo.
Disassembly summary of charging head network
The flash mob 20W PD fast charging charger adopts a straight panel design, the waist piano is painted, the input terminal is equipped with a fixed pin, and the output top surface is sanded and concave, which is very typical. The USB-C interface supports Apple 2.4A, QC, AFC, FCP, SCP, PE2.0 and PD3.0 protocols. It also has three sets of fixed voltage gears, 5V3A, 9V2.22A and 12V1.67A, which can meet the charging needs of major brands of mobile phones, including iPhone.
After disassembling the charging head network, it was found that the PCB board of this charger has sufficient space, and there is a good spacing between the components, so it is not easy to accumulate heat. The output end is vertically welded with a small protocol board. In addition, the charger uses Xinmao Micro highly integrated high-performance synchronous rectifier chip LP20R100S, and Yingjixin IP2723T protocol chip. This chip has not only passed the USB IF Association PD3.0 PPS certification, but also requires few peripheral devices in application, effectively reducing the size of the overall scheme and reducing BOM costs.