Microchip has released an AC-DC reference design based on the new dsPIC33F 'GS' series of digital power digital signal controllers (DSCs). This reference design demonstrates how digital power techniques are applied to reduce component count, lower product cost, eliminate oversized components and incorporate topology flexibility to develop the best solution for the application.
The reference design unit works from a universal input voltage range and produces three output voltages, with a continuous power output rating of 300 W. The front-end power factor correction (PFC) boost circuit converts universal AC input voltages to a 420 V d.c. bus voltage. A full-bridge transformer isolated buck converter, incorporating a phase-shift zero voltage transition (ZVT) circuit, produces 12 V d.c. at 30 A from the 420 V bus. The phase-shift ZVT converter also provides output voltage isolation from the AC mains input. A multiphase synchronous buck converter then produces 3,3 V d.c. at 69 A from the 12 V d.c. bus, and a single-phase buck converter produces 5 V d.c. at 23 A from the same bus.
The reference design is powered by one of Microchip’s new dsPIC33F 'GS' series of DSCs, which controls the PFC boost circuit and the primary-side ZVT full-bridge circuit. A second 'GS' series dsPIC33F monitors the 12 V bus voltage and controls the four buck converters.
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