GWS250 AC-DC power supplies achieve high efficiency

TDK-Lambdavisit website


GWS250 AC-DC power supplies achieve high efficiencyTDK-Lambda UK is launching the GWS250 AC-DC power supplies that comply with the energy-saving requirements of Energy Star and the ErP (Energy related Products) Directive. Suitable for use in light industrial equipment and front-end equipment for broadcast and communications applications, the 'green' 250W GWS series AC-DC power supply uses innovative design features to combine high efficiency, high power density and low standby power with the confidence of a five-year warranty. The GWS250 is also well-suited to indoor and outdoor LED information displays and digital signage, traffic controls, test and measurement, and entertainment systems.

Designed with a 105x199mm footprint and 1U height, the GWS250 is a compact, convection-cooled PSU fitting into spaces previously requiring a fan-cooled model. Rated at 250W the power supply is offered in four models with nominal outputs of 12V (21A), 24V (10.5A), 36V (7A) and 48V (5.3A). Outputs are user-adjusted by up to 20 per cent depending on model type – and the 24V and 36V models have a peak power rating of 300W. With a flat efficiency curve averaging at 93 per cent between 25 and 100 per cent load, the GWS250 range can be operated at full load from -25 to 50degC ambient temperature and up to +70degC with suitable derating.

The GWS250 series from TDK-Lambda has overvoltage, overtemperature and overcurrent protection (constant-current mode for 24V, 36V and 48V models, 12V hiccup mode). Models in the GWS250 series also feature <0.5W no load input power, 5V/0.3A standby output, remote on/off, DC 'GOOD' signal and a voltage programming function as standard.

CE marked in accordance with the LVD (Low Voltage Directive), the GWS250 carries a host of environmental and safety approvals including EN 55022 and FCC Class B, UL60950-1, CSA C22.2 No.60950-1-07 (cUL), EN 60950-1 edition 2 and IEC 60950-1. For more information about the GWS series power supplies, which includes supporting datasheets, please call TDK-Lambda UK directly on +44 (0)1271 856600 or visit the website at:

Planning for future ErP requirements

"In November 2009, the Eco-Design Directive EuP was replaced by the new ErP (Energy-related Products) Directive 2009/125/EC," explains Martin Southam, Marketing Director of TDK-Lambda EMEA. One of the first implementing measures under the ErP Directive to be enforced is for no-load input power consumption. Initially, this value is set so that it should not exceed 1W; however, it is expected to drop to below 0.5W by January 2013. "More and more of our end system customers are asking for low standby power consumption – even when their own equipment does not fall within the scope of ErP today we find that there is a real desire to produce environmentally-responsible products," adds Southam. "With this in mind, TDK-Lambda designed the GWS series with <0.5W no-load input power, helping designers achieve those regulations easily and ensuring that end systems are future-proofed beyond January 2013."

Follow the link for more information about the GWS series AC-DC power supplies from TDK-Lambda.

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