TDK Lambda Americas Inc
TDK World Wide


November 18, 2008 Editorial & Technical Contact:
Mel Berman, Lambda Americas

TDK-Lambda Takes Digital Power Control to the Next Level

SAN DIEGO, CA (November 19, 2008) - Taking digital power control to the next level, TDK-Lambda's new EFE Series of embedded front-end power supplies delivers industry leading power density, high efficiency, and enhanced reliability. The first products in the range are the 300-watt EFE-300 and the 400-watt EFE-400 single output supplies that deliver 133% peak power capability for 10 seconds and offer a class-leading efficiency of up to 90%.efe series

The EFE Series employs an 8-bit microcontroller for full digital control of the output and to handle housekeeping routines This brings a 25% parts count reduction to achieve a 45% smaller and up to 56% lighter design when compared to similar recently announced competitive products. Power densities of up to 22W/in3 are achieved under peak load conditions and 16.6W/in3 under continuous loading.

Compact dimensions and a 1U profile (the EFE-300 is only 3" x 5" x 1.34" and the EFE-400 is only 3" x 6" x 1.34") allow the EFE Series to be incorporated in designs where space is limited, so end products can be smaller, cooler and more feature rich. Typical applications include broadcast, instrumentation, industrial, ATE, automation, routers, servers and security networks.

The new digitally controlled power supplies incorporate many innovative design features including an integrated magnetics transformer that increases the overall efficiency. The digital control allows the power supply's performance, such as current limit and start-up characteristics, to be optimized. A low cost primary side control topology is used, supervised by the microcontroller. This results in fewer parts and higher efficiency without sacrificing load regulation performance. Furthermore, the need for an opto-isolator is eliminated – a device which is undesirable for long life power supply designs.

TDK-Lambda's Advanced Development Manager, Andrew Skinner commented: ‘'Many of the design features of the EFE Series directly enhance reliability. For example, having precise control of abnormal situations through proprietary algorithms prevents device overstress. In addition, better circuit noise immunity is achieved compared to analog designs, and the substantial parts count reduction allows for more optimized component spacing leading to improved thermal performance."

The EFE-300 delivers 300W continuous power (400W peak for 10 seconds) with nominal outputs of 12V/25A or 24V/12.5A, and the EFE-400 delivers 400W continuous power (530W peak for 10 seconds) with nominal outputs of 12V/33.3A or 24V/16.7A. All models can be precisely factory programmed to accommodate non-standard system voltages. An additional 12V/0.25A fan supply output is also available and all models operate from a 90-264VAC input. Active power factor correction ensures EN61000-3-2 compliance. Other EMC improving design features, such as the use of SiC diodes, ensure Curve B EMC performance with a significant margin.

As well as the impressive technical performance, the EFE Series meets TDK-Lambda's design guidelines for environmentally responsible products by consuming less energy to manufacture and to operate, having fewer parts, weighing less, and having a long life expectancy. The EFE Series is available in a variety of case options, either open frame or enclosed. The use of low profile output connectors allows maximum airflow for optimized cooling efficiency.

All products in TDK-Lambda's EFE Series are approved to IEC/EN/UL/CSA 60950-1 for general purpose applications and IEC/EN 61010-1 for laboratory and process control applications. In addition, the units carry the CE mark according to the LV Directive, are RoHS compliant, and come with a three-year warranty.

The EFE series are available now with prices starting at $150.00 each in 500 piece quantities. For more information, please call TDK-Lambda Americas directly at 619-575-4400 or visit the website at:

About TDK-Lambda
TDK-Lambda is a subsidiary of the TDK Corporation (NYSE: TDK), a leading global electronics company ( TDK-Lambda has been a major provider of power solutions for over 60 years. The company designs and manufactures a wide range of AC-DC and DC-DC power products for Industrial, Medical, Telecom, Datacom, and Test & Measurement applications worldwide. For more information, please call TDK-Lambda directly on 619-575-4400 or visit the website at:

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