Electronic Products & Technology

Conduction cooled ac-dc power modules communicate via PMBus

March 14, 2022  Stephen Law

TDK-LAMBDA PFH500F series 12V and 48V output, conduction cooled ac-dc power modules are rated at 504W, feature a compact 4” x 2.4” footprint with programming and communication through a PMBus interface. Units are suitable for a variety of applications including COTS (Commercial-Off-The-Shelf) applications, power amplifiers, LED displays and test equipment. Products utilize GaN semiconductors, bridgeless power factor correction, synchronous rectification and digital control, enabling efficiencies of up to 92%. Opto-couplers have been replaced by digital isolators for long term reliability and stability. Accepting an 85 to 265Vac input, modules deliver 12V at 42A or 48V at 10.5A and can be adjusted from 9.6 to 14.4V or 38.4 to 52.8V using the trim pin or PMBus interface. The droop mode current share option enables modules to be connected in parallel for additional power.

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