Compact, conduction-cooled 504-W ac-dc modules offer PMBus communication

The conduction cooled TDK-Lambda PFH500F-28 ac-dc power modules are rated at 28 V 504 W, feature a compact 4×2.4-in footprint and have optional read/write programming and communication through a PMBus interface. These third-generation power supplies are candidates 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 Opto-couplers have been replaced by digital isolators for long term reliability and stability.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 28 V at 18 A and can be adjusted from 22.4 to 33.6 V using the trim pin or PMBus interface. Baseplate cooling allows operation at temperatures ranging from -40 to +100°C. The metal enclosure measures 4×2.4×0.53 in (101.6×61.0x13.3 mm) and is encapsulated for MIL-STD-810G shock and vibration.

Features and options include a 12-V standby voltage with 20 0mA (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 Vac, input-to-output 3,000 Vac and output-to-case 1,500 Vdc.

More information can be obtained at https://www.us.tdk-lambda.com/lp/products/pfh-series.htm, or by calling 800-LAMBDA-4. Product availability for the PFH500F series can be found via the link to TDK-Lambda’s distributor network (see “Check Distributor Stock to Buy”) at https://www.us.tdk-lambda.com/lp/.