TDK-Lambda has extended its successful range of EFE digitally controlled medical power supplies with the introduction of the 400 W, EFE400M medical range.
Combining 4 kV a.c. reinforced input-to-output isolation with dual fusing and an output-to-ground isolation of 1500 V a.c., the series meets EN/IEC/UL/CSA 60601-1 safety approvals for medical equipment, making it suitable for use in B (body) and BF (body floating) type medical applications.
Offered with nominal outputs of 12 V/33,3 A, 24 V/16,7 A or 48 V/8,3 A, all models in the range deliver 400 W continuous power – the 12 V and 24 V models can deliver 530 W peak for 10 seconds – and can easily 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 power supply.
Standard features such as redundant operation, (complete with in-built ORing FET) and a high current standby output (5 V/2 A or 12 V/1 A) 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.
Offered in a 16,5 x 9 cm footprint with less than 1U height, the EFE400M achieves typical power densities of up to 1,06 W/cm³ under peak load conditions and 0,8 W/cm³ under continuous loading. Case options include open frame, U-chassis, cover and chassis, and cover, chassis and fan; an additional 12 V/1 A fan supply is included, if no fan is fitted. 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. The digital control and other EMC improving 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 isolated standby supply of the EFE400M is not affected by the remote on/off. Since the microcontroller is used to digitally predict the output voltage, the line and load regulation can be changed or fine tuned precisely – this is particularly useful when droop paralleling. Protection circuitry for short circuit, over-temperature and over-voltage conditions are also included as standard.
All models in TDK-Lambda’s EFE400M range are approved to Edition 2 versions of IEC/EN/UL/CSA 60950-1 for general purpose applications, IEC/EN 61010-1 for laboratory and process control applications and IEC/EN/UL/CSA 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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