TDK-Lambda has extended its range of EFE300M digitally controlled medical power supplies with the addition of three new models with nominal outputs of 28 V/10,71 A, 40 V/7,5 A or 48 V/6,25 A.
Digital control, combined with a 4 kV a.c. reinforced input-to-output isolation and other specifications such as an output-to-ground isolation of 1500 V a.c., enables the models to meet the rigorous international safety standards of IEC 60601-1 for medical equipment, making them suitable for use in B (general) and BF (direct patient contact) type medical applications. Standard features such as redundant operation capability and a high current standby output make the supplies equally suitable for high integrity applications including broadcast, instrumentation, routers, servers and security networks. Other suitable applications include ATE and automation equipment.
As with previous models in the EFE300M, these three new units deliver 300 W continuous power (400 W peak for 10 seconds) and can accommodate non-standard system voltages by precise factory programming. The patented ‘multiresonant’ topology helps boost efficiency to typically 90%, and the 8-bit microcontroller provides full digital control of the output and handles all housekeeping routines. Typical power densities of up to 1,01 W/cm³ are achieved under peak load conditions and 0,76 W/ cm³ under continuous loading.
An additional 12 V/1 A fan supply is also included and all models operate from 90–264 V a.c. input with dual fusing as standard. Earth leakage current is better than 300 μA, fully complying with medical safety requirements. Active power factor correction ensures EN61000-3-2 compliance. Other EMC design features, such as the use of SiC diodes, ensure curve B EMC performance with a significant margin.
Further features include remote on/off and power good signals; the EFE300M also comes with a 5 V/2 A isolated standby supply, which is not affected by the remote on/off. The inclusion of an ORing FET allows redundant connection of the units with no additional diode required. Output regulation is better than 4% and, since the microcontroller is used to digitally predict the output voltage, the line and load regulation can be changed or fine tuned precisely, which is particularly useful when droop paralleling.
All models in the EFE300M range are approved to IEC/EN/UL/CSA 60950-1 for general-purpose applications, IEC/EN 61010-1 for laboratory and process control applications and IEC 60601-1 for medical equipment. In addition, the units carry the CE mark, according to the LV directive, and come with a three-year warranty.
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