On October 24, 2019, vivo officially released iQOO Neo 855. In addition to this year’s flagship chip, the Dragon 855, the phone also provides users with a faster charging experience. The iQOO Neo 855 supports 33W fast charging and comes standard with a FlashCharge 2.0 fast charging charger with an output of 33W. Here’s a detailed teardown of this charger.
At the same time, the charging head network has also been dismantled in the vivo 44W SUPER Flash Charge ultra-flash charger, vivo X9Plus charger, VIVO Xplay5 power adapter and other products, you can click on the link to learn more about the dismantling.
I, vivo 33W FlashCharge 2.0 fast charge charger appearance
The vivo 33W FlashCharge 2.0 fast charge charger is flat and the housing is partially made of white PC flame retardant material with fixed pins and USB-A output. The front and sides of the charger do not have any parameter information, look very simple.
Product parameters are printed on the back of the charger, vivo FlashCharge 2.0 charger, Model: V3330L0A0-CN, output: 100-240V to 50/60Hz 0.85A, output: 5V/2A or 9V/2A or 11V/3A. Charger manufacturer for Huizhou Jinhu Industrial Co., Ltd., has passed the CCC certification.
National standard fixed AC pin.
The USB-A output interface uses a white core and visible four pins inside.
The vivo is slender in size than Apple’s 30W PD fast-charge charger.
The net weight of the charger is about 72g.
Using The ChargerLAB POWER-Z KT001 to detect the output protocol of the USB-A interface, the display supports the USB DCP protocol and QC2.0 fast charge, and under the QC2.0 fast charge protocol, the charger has a maximum output voltage of 9V.
II, vivo 33W FlashCharge 2.0 fast charge charger disassembly
Charger shell for ultrasonic welding, very strong, strong output, side cover plate pry deformation before it can be opened.
After removing the cover, you can see that the internal PCB board is fixed in the guide groove on the inside of the housing, and the output USB-A interface is designed with a plastic dust shield. Two output anti-jamming Y capacitors and output filtered solid-state capacitors can also be seen.
The inside of the housing uses metal shrapnel to contact the PCBA module on.
Take out the PCBA module, pcb board front is yellow, single-sided circuit board, above mainly plug-in components, including transformers, capacitors, delay fuses, safety X capacitor, common mode inductor, etc., and between components using adhesive reinforcement treatment.
The input sits with a delay fuse, an x capacitor, a common mode inductor, ntC surge suppression resistance, input filter electrolytic capacitor, etc. Large amounts of silicone are used around transformers and electrolytic capacitors to secure and conduct heat.
Delay fuse, 250V 2A.
The gray is the Safety X capacitor.
A close-up of the common mode inductor.
NTC surge suppression resistance is used to suppress surge shock when power is applied.
The input filter ingress using four electrolytic capacitors, three of which are slightly larger, with a capacity of 12?F and one with 8.2?F, and two Y capacitors to the right of the electrolytic capacitor.
AiSHi Aihua input filter electrolytic capacitor, size 450V 12 sF, 105 degrees C heat resistance.
Another input filter edgto capacitor, size 450V 12?F.
Also an electrolytic capacitor for AiSHi Aihua, the specification is 450V 8.2?F.
There is a word inductor next to the electrolytic capacitor.
The transformer is wrapped with white mara tape and has been silk-printed with the label information.
Next to the transformer is a PWM chip-powered capacitor, provided by Koshin Dongjia Electronics, 50V 4.7?F.
The side of the transformer is wrapped with yellow horse-drawn tape and two secondary output lines are welded to the post on the secondary side. The primary and secondary sides are isolated using a plastic insulated gear plate.
The output side USB-A interface is centered, custom-made, with a plastic dust cover, two Y capacitors on the left and two solid-state filter capacitors on the right.
There are two fixed welding feet under the USB-A connector.
Two solid-state filter capacitors, both available in size 16V 470?F.
The two output anti-jamming capacitors are in series.
The design of the primary and secondary hollowing on the back of the PCB board and the insertion of a plastic insulation plate provides an effect of strengthening the insulation.
The input is made of four diode bridge rectifiers, silkscreenRS3MBF.
The primary master chip comes from Liyuan Technology, silk screen 6C -L2H, model RT7753GCV.
Liyuan RT7753GCV detailed specifications.
The primary master switch MOS tube is supplied by Hangzhou Shilan Microelectronics, model SVF65R950CMJ/D, NMOS, in toe-252-2L package.
Sheeran SVF65R950CMJ/D details.
1009 optocoupler for regulating the feedback output voltage.
The secondary synchronous rectifier controller is the Lisse Technology RT7220B.
Liyuan Technology RT7220B information introduction.
The secondary side is driven by the synchronous rectifier MOS tube of Vanguard Vime, model VS6410AS, voltage-resistant 60V, 5V logic voltage.
Vanguard Wimter VS6410S details.
The fast-charging protocol chip uses the RT7203T, RT7203T is a programmable integrated fast charge protocol controller, and built-in feedback loop, ADC, temperature detection, CC/CV control, built-in processor for different proprietary protocols, this controller is designed for high power density switching power supply, can be modified by firmware programming protection settings. Very powerful.
Liyuan RT7203T detailed specifications.
Vivo’s latest FlashCharge 2.0 fast charge charger is a far cry from the original charger, and the body is shorter. The body housing is made of white flame retardant PC material, matte treatment, scratch resistant and fingerprint-free. In terms of performance, in addition to supporting vivo’s latest FlashCharge 2.0 fast charge, it also supports the QC2.0 fast charge protocol, which is compatible with the vivo old model 18W fast charge.
The charging head mesh dismantling found that the charger used a full set of vertical fast charging solutions, and the use of Shilan microelectronics primary switch tube and Wei Zhao Semiconductor’s secondary synchronous rectifier MOS tube, the main components are from the industry’s well-known semiconductor enterprises. At the same time, the internal component layout is orderly, compact, and in the transformer perimeter to use a large number of dispensing treatment, strengthen the heat dissipation, to avoid local overheating in the high power output.