TDK Corporation's conduction cooled TDK-Lambda PFH500F-28 AC/DC power modules are rated at 28 V 504 W and feature a compact 4" x 2.4" footprint. They 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 Opto-couplers have been replaced by digital isolators for long term reliability and stability.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 V_AC to 265 V_AC input, the modules deliver 28 V at 18 A and can be adjusted from 22.4 V to 33.6 V using the trim pin or PMBus interface. Baseplate cooling allows operation at temperatures ranging from -40°C to +100°C. The metal enclosure measures 4" x 2.4" x 0.53" (101.6 mm x 61.0 mm x 13.3 mm) and is encapsulated for MIL-STD-810G shock and vibration.

Features and options include a 12 V standby voltage with 200 mA (or 2.4 W) 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 2,500 V_AC, input to output 3,000 V_AC, and output to case 1,500 V_DC.