GaN 500W conduction cooled ac-dc PSUs with PMBus


Inside PFH500F-12 and PFH500F-48 are GaN power transistors, ‘bridge-less’ power factor correction and digital control, with digital isolators replacing optocouplers for reliability. Peak efficiency is 92%.

PMBus is included for programming and remotely monitoring.

Operating from 85 to 265Vac, the 12V PSU can deliver 42A and be trimmed across 9.6 – 14.4V using the trim pin or PMBus, and the 48V 10.5A version can be trimmed across 38.4 – 52.8V.

Droop mode current sharing is included, as is a 12V auxiliary stand-by output. There is also remote on/off, remote sense and an open-collector power-good output.

The PMBus can also activate the remote on/off, and change the under-voltage, over-voltage, over-current and over-temperature set points, as well as read-back input current, output current, input voltage and internal temperature.

Baseplate temperature needs to be maintained between -40 to +100°C.

Input to output isolation is 3kVac, input to case 2.5kVac and 1.5kVdc output to case.

Safety certification is to the IEC/UL/CSA/EN 62368-1, with CE and UKCA marking for the Low Voltage and RoHS Directives.

Evaluation boards are available.

Applications are foreseen in LED signage, power amplifiers, test equipment and measurement equipment.

The PFH500F  product page is here





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