Conduction cooled power module offers PMBus communications

17th January 2019

Alex Lynn

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Datasheet

The introduction of the TDK-Lambda brand PFH500F 28 high efficiency AC-DC power supplies, has been announced by TDK Corporation. Rated at 504W, the baseplate conduction-cooled module is packaged in a compact 101.6x61mm footprint. Using industry standard PMBus commands, the output voltage and fault management levels can be adjusted (read/write) and product status read back.

The PFH500F series has been designed for outstanding performance in COTS (Commercial-Off-The-Shelf), LED signage, communications, broadcast, test and measurement equipment.

The PFH500F-28 has an operating efficiency of up to 92%, enabled through the use of the latest technology. This includes GaN semiconductors, bridgeless power factor correction with synchronous rectification and digital control. A digital isolator replaces the traditional optocoupler for long term stability and reliability.

Operating from a wide range 85 to 265Vac input, the PFH500F-28 will deliver 18A at 28V with an adjustment capability of 22.4 to 33.6V via the trim pin or the PMBus. Other output voltages will be available later in 2018. The module has a baseplate temperature range of -40 to +100°C and measures 101.6x61x13.5mm.

Product features and options include droop mode current share, a 12V auxiliary standby output, remote on/off, remote sense, an open collector power good signal, output trim and PMBus communication. The PMBus can be used to program the output voltage, activate the remote on/off, change the under/over-voltage, over-current and over-temperature set points, plus read-back input and output current, input voltage and internal temperature.

Input to output isolation is 3,000Vac, input to case 2,500Vac and 1,500Vdc output to case. Safety certification is to IEC/EN/UL 60950-1 standards with CE marking for the Low Voltage and RoHS2 Directives.