GaN chips reduce footprint for 504W AC-DC converter in test systems

January 15, 2019 //By Nick Flaherty
GaN chips reduce footprint for 504W AC-DC converter in test systems
TDK has launched an AC-DC power supply module rated at 504W that measures 101.6mm x 61mm footprint by using gallium nitride (GaN) power devices. 

The baseplate conduction cooled TDK-Lambda PFH500F‑28 is aimed at test and measurement equipment as well as LED signage, communications and broadcast designs and uses industry standard PMBus commands for remote control.

The PFH500F-28 has an operating efficiency of up to 92% by using GaN power 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 - 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°C to +100°C and measures 101.6 x 61 x 13.5mm (L x W x H).

The module handles 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.

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