First PFC and hybrid flyback combo IC for mobile and battery-powered devices

Infineon Technologies AG has introduced the novel XDP digital power XDPS2221. This highly integrated combo controller IC for USB-PD supports high power designs in wide input and output voltage applications up to 28V output voltage.

The device combines an AC/DC PFC controller with a DC-DC HFB, also known as an asymmetrical half-bridge (AHB), in one package. Regulatory needs can readily be fulfilled through the harmonised operation of the two stages. Also, the further integration of all gate drivers and a 600V high voltage start-up cell for the initial IC voltage supply and the certified active X-capacitor discharge allow a low external BOM and component count. Based on a novel ZVS HFB topology in conjunction with GaN-based devices, it brings class-leading efficiency across many line/load conditions. Thanks to these features and inherent topology advantages, including zero voltage switching and resonant energy transfer for transformer size reduction, system designs utilising the device can deliver very high-power densities.

Moreover, the new combo IC provides a synchronous PFC and HFB burst mode operation for the lowest possible no-load input standby power performance. The quasi-resonant multimode PFC stage is improved with automatic PFC enable/disable functionality and adaptive PFC bus voltage control to maximise average and light load efficiency. Optionally, the integrated PFC function can also be disabled to support the use case with any external PFC Controller.

The hybrid flyback stage utilises peak current control operation for robust regulation and fast dynamic load response. To provide ZVS operation under all conditions, the hybrid flyback features ZVS pulse insertion, incorporating body diode cross-conduction prevention in discontinuous conduction mode. Furthermore, the device also offers easy-to-configure parameters through a GUI to optimise system performance.