Rated at 504 W, the baseplate conduction-cooled PFH500F-28 from TDK-Lambda is packaged in a compact 101,6 x 61 mm 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 is optimised for 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 265 V a.c. input, the module will deliver 18 A at 28 V with an adjustment capability of 22,4 – 33,6 V via the trim pin or the PMBus.
It has a baseplate temperature range of -40°C to +100°C and measures 101,6 x 61 x 13,5 mm (L x W x H).
Product features and options include: droop mode current share, a 12 V 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 3 000 V a.c., input to case is 2 500 V a.c. and output to case is 1 500 V d.c. Safety certification is to IEC/EN/UL 60950-1 standards with CE marking for the Low Voltage and RoHS2 directives.
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