Convection cooled miniature PSU increases reliability and reduces noise

Powerstax has introduced a convection cooling option for its N-03751-PFC Series of ultra-compact AC-DC switching power supplies. The N-03751-PFC Series is designed for outdoor and semi-sealed industrial applications and low noise office environments and its low profile will suit 1U rack mounted systems.

Picture: Powerstax

The new convection cooling option delivers 260W of output power across all output voltages and eliminates the fans and fan controllers required to cool conventional power supplies. The convection cooling option reduces costs and frees-up valuable system real-estate. As the Powerstax N-03751-PFC does not require forced air for full 260W operation, the system designer no longer has to be concerned with channelling air over the PSU, simplifying thermal design. Removing the fans also significantly increases the reliability of the Powerstax N-03751-PFC and reduces audible noise of end products, making them ideal for office environments.
Where an end system may be used in different environments, system level design can be simpified by specifying the convection cooled Powerstax N-03751-PFC and if required substituting the forced-air cooled version which offers the same very compact, low profile 5×7.7×2.3mm (3.3x5x1.5”), packaging, connectors and layout, saving design time and costs.
“Powerstax power supplies are inherently reliable,” said Tim Worley, CEO of Powerstax. “Since the reliability of a power supply is in many cases degraded by the reliability of its cooling fan, the introduction of this range of compact convection cooled power supplies offers our customers a very real increase in reliability with added packaging and cost benefits. Convection cooled power supplies reduce overall system power consumption and cooling requirements and are not susceptible to failures due to dust clogging fans or airborne contamination of their circuit boards.”
The synchronous rectification technique of the Powerstax N-03751-PFC Series delivers high efficiency, up to 93% in some models and all models feature active current sharing allowing up to four power supplies to be operated in parallel for high output power applications. An optional active OR-ing MOSFET board is also available for N+1 redundant applications. Both 5V standby and 12V auxiliary outputs can be wired OR-able when the main output is disabled.
The Powerstax N-03751-PFC Series has a very compact footprint of 3.3” x 5.0” (83.8mm x 127.0mm) and low profile of 1.5” (38.1mm) suitable for use in 1U racks, an active PFC input over the range 90–264 VAC, an operating temperature range of –25ºC to +50ºC and meets a full range of international agency requirements, including RoHS, UL, DEMKO, CE Mark and FCC Class B. Output is protected against overvoltage, overpower, short circuit and over temperature.

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