Power Supplies

GaN-Based Conduction Cooled AC-DCs Pack 504W in 4” x 2.4” Footprint

TDK Corporation has announced the introduction of the conduction cooled TDK-Lambda PFH500F-28 ac-dc power modules.  The power supplies deliver 504W at 28V, feature a compact 4″ x 2.4″ footprint and have optional Read/Write programming and communication through a PMBus™ interface.

These third-generation power supplies are ideal for a variety of applications including COTS (Commercial-Off-The-Shelf), power amplifiers, LED displays and test equipment.

The PFH500F-28 series utilizes 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 Opto-couplers have been replaced by digital isolators for long term reliability and stability.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 265-Vac input, the modules deliver 28V at 18A and can be adjusted from 22.4 to 33.6V using the trim pin or PMBus interface.  Baseplate cooling allows operation at temperatures ranging from -40 to +100°C.  The metal enclosure measures 4 x 2.4 x 0.53″ (101.6 x 61.0 x 13.3mm) and is encapsulated for MIL-STD-810G shock and vibration.

Features and options include a 12V standby voltage with 200mA (or 2.4W) capability, remote on/off, pre-biasing start-up, droop mode current share, a DC Good signal, various protections (OVP, UVP, OCP, OTP) and a PMBus interface. The interface can be used to program (read-write) the output voltage and fault management functions and monitor the unit’s operating status.

The series has been certified to the IEC/UL/CSA/EN 60950-1 safety standards (62368-1 pending) and carries the CE mark for the Low Voltage and RoHS Directives.  Input-to-ground isolation is 2,500Vac, input-to-output 3,000Vac and output-to-case 1,500Vdc.

Summary of features and benefits

  • 4″ x 2.4″ foot-print
  • High Efficiency – up to 92%
  • PMBus™ interface
  • Parallel capability (droop mode)
TDK Corporation
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