Silicon nitride technology launched a65WGallium nitrideFast charging reference design, this reference design has2C1AOutput interface, any USB-C interface supports65WFast charging output.This reference design adopts the latestGallium nitrideIntegrated controller chip DXP8001FA, which integrates GaN HEMT and controller, greatly reducing the difficulty of circuit design and debugging.
At the same time, this chip also supports a wide power supply voltage range, meeting the output voltage range of PD fast charging, without additional components for power supply, further simplifying the peripheral circuit.The following charging head network brings the silicon nitride technology65WGallium nitrideAnalyze the integrated fast charging scheme, and let's have a look at the design of this scheme.
Nitrogen silicon technology65WThere is a small board on the side of the reference design.
The small side plate is welded with the rectifier bridge and synchronous rectifier circuit, and the output side is also welded with a small plate to weld the USB-C output bus.
The length of PCBA module measured with vernier caliper is about 53.8mm.
The width is about 48.3mm.
The thickness is about 24mm.
The measured reference design weight is about 65g.
Power on the DEMO, and use the ChargerLAB POWER-Z KM003C to measure that the USB-C1 interface supports the charging protocols of FCP, SCP, AFC, QC3.0/4+, SFPP, PE2.0, PD3.0, PPS, DCP, SAM 2A, and Apple 2.4A.
PDO message shows that USB-C1 port also has five sets of fixed voltage gears: 5V3A, 9V3A, 12V3A, 15V3A, 20V3.25A, and 3.3-11V5A, one set of PPS voltage gears.
It is measured that the compatible protocol of USB-C2 port is the same as that of USB-C1 port.
In addition, the PDO message is the same, and the single port output performance of the two USB-C ports is the same, supporting power blind insertion.
Finally, it is measured that the USB-A interface supports the charging protocols of FCP, SCP, AFC, QC3.0, SFPP, PE2.0, DCP, SAM 2A, and Apple 2.4A.
Nitrogen silicon 65WGallium nitrideAnalysis of Reference Design of Integration Scheme
At the front of the PCBA module, the lower left corner is welded with input fuse, safety gauge X2 capacitor, and the bottom panel is welded with NTC thermistor and common mode inductance.High voltage filter capacitor is welded on the upper left side, and transformer is welded on the right side.The right side is welded with the output step-down board, on which the step-down inductance and filtered solid capacitor are welded, and the bottom board is welded with the synchronous rectifier controller and filtered solid capacitor.
The back of PCBA module is welded with GaN integrated controller chip, two SMD Y capacitors and feedback optocoupler.Silicon nitride technology's reference design is 65W output power, with a fixed voltage output and a synchronous buck circuit design architecture.Now we will analyze this reference design from the input side.
List of PCBA module input terminals, welding high-voltage filter capacitor on the left, welding fuse on the right, safety gauge X2 capacitor and NTC thermistor.
The input fuse is insulated by a heat shrink tube.
The safety gauge X2 capacitor is from Konyson, and the specification is 0.22 μ F.
NTC thermistor screen printing 3D-7 is used to suppress power on surge current.
Common mode inductance is wound with enameled wire and insulated wire.
The small plate on the side of PCBA module is welded with two rectifier bridges, synchronous rectifier controller and synchronous rectifier tube.
Two WRMSB40M rectifier bridges at the input end are from Shenzhen Walde Industrial Co., Ltd., with the specification of 4A 1000V.The WRMSB40M soft bridge can reduce the diode junction capacitance to achieve the effect of very little harmonic oscillation through a relatively soft recovery curve and a relatively smooth turn off characteristic.
Weld a high-voltage filter capacitor from Yongming behind the small plate of rectifier bridge.
The specification of high-voltage filter capacitor is 27 μ F400V.
Behind the input fuse is a differential inductance, which is insulated by a heat shrink tube.
The other four filter capacitors have the same specification, all 27 μ F400V, and the total filter capacitance is 135 μ F.
The core element of this reference design comes from silicon nitride technology. It is a GaN integrated controller chip, model DXP8001FA.650V 165m Ω GaN switch and high-frequency flyback controller are integrated in the chip for the application of PD fast charging adapter.The chip supports 9-85V power supply voltage range, covering 3.3-21V output voltage of PPS and PD fast charging, without additional power supply winding and step-down circuit.
Silicon nitride technology DXP8001FA adopts adaptive multi-mode control, supports DCM and QR working modes, and supports burst mode to improve energy efficiency.Rich protection functions are integrated inside the chip, including output overvoltage protection, power supply overvoltage protection, BROWN IN/OUT protection, sampling resistance short circuit protection.
Silicon nitride technology DXP8001FA adopts DFN8 * 8 packaging to effectively reduce chip temperature rise.By integrating GaN switches and controllers, the conversion efficiency, power density, reliability and switching frequency are improved, the impact of parasitic parameters on the system is reduced, and the number of components is reduced, simplifying the design of fast charging power supply.
Silicon nitride technology DXP8001FA information.
The transformer core is tightly wound and insulated with tape.
The SMD Y capacitor comes from Sichuan Teruixiang Technology Co., Ltd., which has the characteristics of small size and light weight, and is very suitable for use in high-density power products such as GaN fast charging.The material number is TMY1102M, and the lower one is TMY1222M.
Teruixiang focuses on the R&D, production and sales of passive components, with a registered capital of 100 million yuan.It has two independent capacitor brands: SMD TRX and DIP TY capacitors. TRX will devote itself to the research of ceramic materials to expand the application of more categories and provide customers with more solutions.
Yiguang EL1019 optocoupler is used for output voltage feedback.
The synchronous rectifier controller is screen printed with IBHJN, the actual model is MP6908A, from MPS core source semiconductor, and the maximum operating frequency is 600KHz.It supports DCM, CCM, QR, ACF multiple working modes, supports high side and low side applications, and has ring detection to prevent false opening.
Synchronous rectifier tube is from Weian, model: WMB072N12LG2, NMOS withstand voltage: 120V, conductivity: 5.4m Ω, and it is packaged with PDFN5060-8L.
The output filter capacitor is sheathed with red insulating sleeve.
The output end is welded with a step-down small board, the small board is welded with a USB-C bus base, a synchronous step-down switch tube, and a filtered solid capacitor.
The back of the small board is welded with a step-down inductor.
The main control chip of the two buck circuits adopts Zhirong SW3516H for buck control and protocol identification.Zhirong SW3516H is a highly integrated dual port charging chip with multi fast charging protocol, which supports arbitrary fast charging output of A+C ports and independent current limiting of two ports.
The SW3516H integrates a 5A high-efficiency synchronous buck converter.Support multiple fast charging protocols such as PPS/PD/QC/AFC/FCP/SCP/PE/SFCP, maximum output PD 100W, CC/CV mode, and dual port management logic.Only a few devices are needed in the periphery to form a complete high-performance multi fast charging protocol dual port charging solution.
The other way of buck protocol chip also uses Zhirong Technology SW3516H.
Two circuits of synchronous step-down switch tube are from Ruijun Semiconductor, RUH4040M2, NMOS, 40V withstand voltage, 8m Ω conductivity, and PDFN3333 packaging.
Two step-down inductors are insulated with heat shrinkable tubes.
The two filter capacitors are from Raytheon, with a specification of 220 μ F25V, and they correspond to two outputs respectively.
A filter capacitor of the same specification is also welded on the back of the small board.
The VBUS switch tube for USB-C2 and USB-A ports is from Ruijun Semiconductor, RU30D20. It is a dual N MOS, with a withstand voltage of 30V and a conductivity of 8.5m Ω. It is packaged with PDFN3333.
Close up of non-standard MCU for automatic power distribution control.
The USB-C mother seat is fixed by via welding, and the black rubber core does not expose copper.
USB-A mother seat adopts green rubber core, and the front end is equipped with auxiliary contacts.
Summary of charging head network
Through the analysis of the reference design of the silicon nitride DXP8001FA GaN integrated controller chip, it is found that this reference design of the switching power supply primary only uses one chip, replacing the design of the controller+GaN switch tube in the traditional GaN fast charging.In the reference design, the silicon nitride technology DXP8001FA GaN integrated controller chip is used. The chip is a flyback architecture with fixed voltage output.
The output adopts two independent buck circuits, uses Zhirong Technology SW3516H buck protocol chip, matches with external switches and buck inductors, and realizes three port fast charging.The PCBA module adopts three small plates combined and welded to disperse the heat source, reduce the temperature rise and facilitate the heat dissipation design.
Silicon nitride technology DXP8001FA adopts adaptive multi-mode control, supports DCM and QR working modes, and supports burst mode to improve energy efficiency.Rich protection functions are integrated inside the chip, and the DFN8 * 8 package with enhanced heat dissipation is used to provide an efficient and reliable solution for GaN fast charging.