For a long time, multi-port chargers have been favored by users with their small size, support for multi-device simultaneous charging, portable and easy storage, etc., especially since the cancellation of standard chargers by mobile phone brands represented by Apple and Samsung, the market demand for multi-port fast chargers has further increased.
At present, the multi-port charger on the market is mainly concentrated in the 45W and above power band, for users, the selection range of multi-port fast charging sources within 45W is very limited, and the small-power fast charging sources using dual USB-C design are even fewer. To this end, Biyiwei recently launched two sets of 35W dual USB-C port fast charging source scheme, which are based on traditional Si MOS devices and the development of gallium nitride chips, the former has been reported in detail on the charging head network, and the following continues to introduce the Biyi micro 35W gallium nitride dual USB-C fast charging scheme for everyone.
The scheme adopts KP22064 of gaN sealed on the original side, KP4060 on the secondary side, and the protocol chip adopts the latest SW3556 of Zhirong, and the whole set of solutions is designed to be small and concise.
From a positive point of view, The Biyiwei 35W Gallium Nitride dual USB-C port fast charging scheme is basically consistent with the Si MOS scheme previously introduced. The structure of a power supply motherboard and two auxiliary boards is adopted, the transformer is arranged in the center, two high-voltage electrolytic capacitors are provided at the input end, and the two USB-C interfaces are soldered vertically on the secondary PCB board on the secondary side, and the secondary buck output is used.
The surface circuit design of the PCB board back is very simple, the primary side adopts a closed gallium nitride chip, the secondary side is laid out with a synchronous rectifier chip and synchronous rectification MOS, there is a wide isolation between the primary and secondary, and the optocoupler, Y capacitor, and rectifier bridge are all chip packages.
Biyi micro KP22064 closed gallium nitride chip built-in 0.4Ω conductive resistance gallium nitride switch tube, using DFN8×8 package, the bottom of the area of 90% of the heat dissipation PAD, the operating frequency up to 500KHz, can greatly improve product performance, reduce product volume, support maximum 45W power output, suitable for 30W-45W gallium nitride fast charging design.
Biyi micro KP22064 integrates a high-voltage start circuit, which can obtain fast start-up and ultra-low standby performance, and the chip also integrates the X capacitor discharge function to solve the standby loss problem caused by the X capacitor discharge resistor. Built-in stable and reliable drive circuit, greatly optimizing the design of gallium nitride products. The Pirwik KP22064 operates in valley on mode with the highest frequency configured through the corresponding pins and peak current jitter to optimize EMI performance. The chip operates in green energy-saving mode and hiccup mode, and the standby power consumption is less than 30mW.
Biyi micro KP22064 integrates complete protection functions, including VDD undervoltage protection (UVLO), VDD overvoltage protection (VDDOVP), input undervoltage protection (BOP), input overvoltage protection (LOVP), X capacitor discharge protection, output overvoltage protection (OVP), cycle-by-cycle current limiting (OCP), overload protection (OLP), output current overcurrent protection (SOCP), built-in overtemperature protection, soft start, front blanking (LEB) CS pin open circuit protection, etc.
The secondary side synchronous rectifier controller is also from Biyiwei, model KP4060, the chip supports DCM, CCM, QR working mode and active clamp Flyback topology, supports 600kHz operating frequency, integrated high voltage detection circuit and high voltage power supply circuit, integrated intelligent dual LDO, no need for auxiliary winding power supply, support output short circuit SR operation. It is available in a space-saving SOT23-6 package.
The Biyi micro KP4060 supports a wide range of output voltage applications, especially suitable for fast charging fields that support QC, PD and other protocols. And supports high-side or low-side configurations.
The dual USB-C port output of this scheme adopts the secondary buck architecture, and selects the Zhirong SW3556 as the buck and protocol controller, and the chip can support PPS, PD, QC, AFC, FCP, SCP, PE, SFCP, TFCP and other mainstream fast charging protocols; the scheme supports blind plug output of 35W power when the single port output, and has 5V3A, 9V3A, 12V2.92A, 15V2.33A, 20V1.75A a variety of voltage gears, to meet different types of equipment charging, dual port simultaneous output total power of 5V3A.
The measured Biyi micro 35W Gallium Nitride dual USB-C fast charging scheme is about 52.15mm in length.
The width is approximately 32.5mm.
The thickness is about 18.77mm, and the equivalent power density is about 1.1W/cm.
Charging head net summary
Following the cancellation of the 20W fast charging market with a charger for Apple mobile phones, the 30W gallium nitride fast charging has also ushered in a wave of growth. However, with the increase in the number of electronic products in the hands of users, the application advantages of dual USB-C port chargers have gradually become prominent, and 35W dual C port fast charging is also a relatively new product specification, which has the advantage of maintaining a small size and portable volume, and taking into account the functions of dual-port fast charging and laptop charging.
The set of 35W Gallium Nitride dual USB-C port fast charging scheme launched by BiyiWei is based on the development of a closed Gallium nitride chip, which uses a chip on the primary side, only needs to be equipped with simple peripheral devices, while ensuring output performance, taking into account low cost, easy debugging, etc. It is worth mentioning that this 35W gallium nitride dual C-port fast charging scheme has completed various performance tests inside Biyi Micro, and the efficiency, ripple, EMI, etc. have reached the requirements of mass production.