New 500-W power supply models combine 90 percent typical efficiency and ErP compliance with sub-0.5-W standby power

March 20, 2012 // By Paul Buckley
TDK Corporation has introduced the TDK-Lambda GWS500 series of 'green' power supplies which comply with the energy saving requirements of the ErP (Energy-related Products) Directive.  The GWS500 AC-DC power supply combines high efficiency, high power density and low standby power with the confidence of a five-year warranty.

The GWS500 is well -suited to a broad range of industrial applications, including ATE, automation and instrumentation.

Rated at 500 W, the GWS500 combines a 1U form factor with 105x218 mm footprint and 90% typical efficiency to achieve a power density of 8.7 W/in 3. Offered in four models, the GWS500 supplies nominal outputs of 12 V (42 A), 24 V (21 A), 36 V (14 A) and 48 V (10.5 A). Outputs can be user-adjusted by up to 20% depending on the model type, and the 24 V and 36 V models have a peak power rating of 600W.

With a flat efficiency curve averaging at 89%, from 25 to 100% load, which exceeds the ErP requirement of 87%, the GWS500 operates from -25 to 70°C with suitable derating. The high power GWS500 is reverse fan cooled (exhale) to mitigate contamination risk.

The GWS500 series from TDK-Lambda has overvoltage, overtemperature and overcurrent protection (constant current mode for 24 V, 36 V and 48 V models, 12 V model in hiccup mode). Models in the GWS500 series also feature a sub-0.5 W standby power, 5 V/0.3 A standby output, remote on/off, DC GOOD signal and a voltage programming function as standard.

All GWS500 models operate from an 85- input with active power factor correction to ensure EN61000-3-2 compliance. CE marked in accordance with the LV Directive, the GWS500 conforms to EN55022 and CISPR22 Class B conducted and radiated EMC, and meets CSA/IEC60950-1 Ed 2 and UL/EN60950-1 safety approvals.


The GWS500 series is available in stock for immediate sale.

More information about the GWS500 series power supplies at