TDK-Lambda introduces 400W medical power supplies

TDK-Lambda EMEA has extended its range of EFE digitally controlled medical power supplies with the introduction of the 400W EFE400M Medical range.

Combining a 4kV AC reinforced input-to-output isolation with dual fusing and an output-to-ground isolation of 1,500V AC, the EFE400M 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 12V/33.3A, 24V/16.7A or 48V/8.3A, all models in the EFE400M series deliver 400W continuous power - the 12 and 24V models can deliver 530W peak for 10sec - and can easily accommodate non-standard system voltages by precise factory programming.

The patented Multi-Resonant Topology helps boost efficiency to typically 90 per cent and the 8-bit microcontroller provides full digital control of the power supply.

The use of digital control allows the EFE400M to be more efficient, smaller, cooler and more feature rich - consistent with the demand for environmentally friendly products.

Standard features such as redundant operation, (complete with in-built Oring FET) and a high-current standby output (5V/2A or 12V/1A) 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 6.5 x 3.5in footprint with less than 1U height, the EFE400M achieves typical power densities of up to 17.4W/in3 under peak load conditions and 13.1W/in3 under continuous loading.

Case options include open-frame, U-Chassis, cover and chassis, and cover, chassis and fan.

An additional 12V/1A fan supply is included if no fan is fitted.

All models operate from 90-264V AC input, with dual fusing as standard.

Earth leakage current is better than 300uA, 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 - 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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