New TDK-Lambda AC-DC power modules

Posted 14 March 2022

TDK Corporation announces the introduction of 12V and 48V output models to the TDK-Lambda brand PFH500F series of high-efficiency AC-DC power modules. The series, rated at 504W, can be conduction-cooled to a cold plate for outdoor applications.

The power modules can be programmed (read/write) or remotely monitored (read) through the industry-standard PMBus interface.

PFH500F-12 and PFH500F-48 utilise the latest technologies, including GaN semiconductors, bridgeless power factor correction and digital control to achieve efficiencies of up to 92%. Digital isolators replace traditional optocouplers for long-term stability and reliability.

Operating from a wide range 85 to 265Vac input, PFH500F-12 will deliver 42A at 12V with an adjustment capability of 9.6 – 14.4V using the trim pin or the PMBus interface.

PFH500F-48 delivers 10.5A at 48V and can be adjusted from 38.4 – 52.8V. The modules have a baseplate temperature range of -40°C to +100°C and measures 101.6 x 61.0 x 13.5mm (L x W x H).

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 and output trim. 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.

The input to output isolation is 3,000Vac, input to case 2,500Vac and 1,500Vdc output to case. Safety certification is to the IEC/UL/CSA/EN 62368-1 standards with CE and UKCA marking for the Low Voltage and RoHS Directives. For ease of testing, fully populated evaluation boards are available.

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