JWT launches high density 33W sealed gallium nitride fast charging power supply scheme

2021-12-17

Gallium nitride has gradually replaced the traditional high-voltage silicon MOS transistor in fast charging because of its advantages of fast switching speed, low conductivity and low input and output charge. The use of gallium nitride instead of silicon MOS tube reduces the switching loss and improves the conversion efficiency of the charger, so that the charger does not need to design a large area of heat sink. At the same time, it can also increase the switching frequency from the traditional 65khz to 130KHz, reduce the inductance of the transformer, reduce the size of the transformer, and reduce the volume of the charger.

By packaging gallium nitride and controller together, the influence of parasitic inductance on gallium nitride can be effectively reduced, and the performance advantages of gallium nitride can be brought into full play. Following the 65W gallium nitride fast charging scheme, jw1566a, a gallium nitride sealed chip with built-in 650V withstand voltage and 480m Ω conduction resistance, has been launched again, and a 33W high-density gallium nitride fast charging scheme has been launched with this chip as the core.

This fast charging scheme is composed of quasi resonant flyback topology, synchronous rectification and four small plates stacked and welded. With the high-density power supply design, the measured size of the power supply scheme is only 28.1 * 22 * 25.5mm, and the power density is 2.1w/cm ³。

JWT 33W sealed gallium nitride adopts the stacking structure of multiple PCBs, which makes full use of space and is very small. Jw1566a highly integrated gallium nitride sealed chip has the advantages of high integration, small volume, low standby power consumption and high efficiency, which can improve the competitiveness of power products.

The use of sealed chip can reduce the negative impact of parasitic parameters on the high-frequency operation of power supply, improve the power conversion efficiency, and simplify the primary design of switching power supply. It can be matched with a variety of protocol chips to meet the design of fast charging charger.