An innovative, highly integrated combo controller for the joint control of the PFC and the hybrid flyback stage.
With the announcement of the USB PD 3.1 standard [1], higher power levels of up to 240 W are enabled. Still, the wide output voltage range from 5 V to 48 V raises new challenges for the converter topologies currently in use. In this white paper, the combination of an AC-DC PFC boost and a DC-DC hybrid flyback (HFB) stage [2], also well known as asymmetrical half-bridge flyback topology, is proposed as the most suitable combination for USB-PD chargers and adapters with wide input and output voltage range.
A novel, highly integrated XDP controller XDPS2221 is used as a combo controller for the joint control of the PFC and the hybrid flyback stage. This integration offers optimal control of both stages to deliver class-leading performance. The shown 140 W AC-DC reference design achieves a full load peak efficiency of up to 95 percent and a high-power density of 22.67 W/in3 (uncased) while delivering an output voltage from 5 V to 28 V with input voltage range from 90 VAC to 264 VAC.
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