504W AC-DC conduction cooled module uses GaN

504W AC-DC conduction cooled module uses GaN

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By Nick Flaherty

The TDK-Lambda PFH500F‑28 uses industry standard PMBus commands so that the output voltage and fault management levels can be adjusted (read/write) and product status read back in LED signage, communications, broadcast, test and measurement equipment.

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. The Transphorm TPH3206LDG FET uses the popular 8×8 PQFN package, and the development was led by the TDK-Lambda Americas in Dallas, Texas, working with Transphorm’s application support team throughout various phases of the three year design process.

“Our decision to work with Transphorm on our first GaN AC-DC product was based largely on the power semiconductors’ proven quality and reliability as well as the team’s reputation for successful collaboration. Our experience was such that we’ve released the PFH500F-28 with our three year warranty and are in discussions with Transphorm regarding future projects,” said Jin He, Vice President of Engineering at TDK-Lambda.

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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