Product category: AC/DC Power Supplies
News Release from: Nu Horizons Electronics Corp | Subject: N2 Power XL275 Series
Edited by the Electronicstalk Editorial Team on 5 July 2007
Digitally controlled switcher
is smart alternative
Very compact 275W AC/DC power supplies feature digital power management and optional PMBus capability
Available now from Nu Horizons Electronics are the first models in the XL275 Series from N2 Power, a family of very compact 275W AC/DC power supplies that feature digital power management and optional PMBus capability. The XL275 Series delivers 275W from a 15in2 footprint, and features very low profile packaging for 12.22W/in3 power density.
This article was originally published on Electronicstalk on 5 July 2007 at 8.00am (UK)
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The XL275 family is expressly designed for OEM applications such as industrial automation, telecommunications, gaming systems, security and surveillance systems and network servers.
The XL275 Series packs more power in a smaller package than any other product on the market, while simultaneously reducing overall power consumption and cooling requirements.
Power supplies have traditionally been controlled and protected by analogue circuitry that does well under one set of conditions (such as cold startup), but suffers from stored charges in components that do not discharge quickly enough to respond to power line dropouts and load glitches.
The XL275 breaks that mould by using a dedicated digital microcontroller to supervise the unit's operation.
The microcontroller monitors the following power supply parameters: DC voltage on the bulk capacitor (supplied by the AC mains), output voltage, output current, auxiliary 12V output voltage, transformer temperature, ambient temperature, and fan tachometer.
Further reading
Power supply deal goes global
N2Power's widely regarded XL125, XL160 and XL250 Series AC/DC power supplies are now available worldwide from Nu Horizons
New source for discontinued devices
Franchise deal brings discontinued semiconductor devices, silicon die and fabrication services to the UK market
Acquisition expands German distribution share
Nu Horizons Electronics has acquired Munich based distributor Dacom-Sud Electronic Vertriebs
Unlike the conventional analogue circuitry that can provide timing accuracies in the range of +/-10-20%, the microcontroller can provide timing accuracies in the 1% range and does not suffer from stored charge memory.
It responds to changing conditions 500 times each second with knowledge of the past, but without being slowed by its knowledge.
The microcontroller is responsible for enabling the main output whenever all the required startup conditions are met and shutting it down on command, loss of input power or whenever the power supply's longevity is threatened by excessive loads or temperatures.
It always provides the host system with advanced warning of an impending shutdown so that it may perform its house-cleaning before power is lost.
To minimise acoustic noise, the microcontroller can turn a 12V fan on or off based on the prevailing load conditions and the amount of cooling air available.
Because it's programmable, the microcontroller code can be customised to fit the OEM's requirements.
An optional I2C digital communications interface is also available to allow up to four XL275s to communicate over the same bus using the PMBus protocol.
This communications interface allows routine remote control of the main outputs and the 12V fans.
It can also notify the host if a fan fails (lost tachometer pulses).
The host can query the microcontroller for its output voltage and current plus the ambient and transformer temperatures.
The XL275 Series incorporates the same industry-leading features as theXL125, XL160 and XL250 power supply families, such as active power factor correction for reduced input power, built in ORing diodes, active inrush current protection, remote on-off, and high efficiency - up to 90% in some models.
All N2Power supplies meet a full range of international agency approvals, including UL, Demko, CE Mark and FCC Class B.
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