AC/DC conduction-cooled power saves space in COTS and digital signage
AC/DC power supplies available from TDK-Lambda now include the PFH500F‑28 high efficiency series. They conduction cooled supplies are rated at 504W and the baseplate conduction-cooled module is packaged in a compact 101.6 x 61 x 13.5mm footprint. The output voltage and fault management levels can be adjusted (read/write) and product status read back using industry standard PMBus commands. The PFH500F series has been designed for COTS, LED signage, communications, broadcast, test and measurement equipment, says TDK-Lambda.
The PFH500F-28 has an operating efficiency of up to 92 per cent, enabled through the use of GaN semiconductors, bridgeless power factor correction with synchronous rectification and digital control, reports TDK-Lambda. A digital isolator replaces the traditional optocoupler for long term stability and reliability.
Operating from a wide range 85 to 265V AC 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 made available, says the company. The module has a baseplate temperature range of -40 to +100°C.
The AC/DC supplies have 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 3000V AC, input to case 2500V AC and 1500V DC output to case. Safety certification is to IEC/EN/UL 60950-1 standards with CE marking for the Low Voltage and RoHS2 Directives.
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