TDK Lambda Americas Inc
TDK World Wide


Power Supply Products

300-600W Constant Current Power Supplies are Suitable for Charging Energy Storage Systems

San Diego, CA – July 2016 –

TDK Corporation announces the introduction of the TDK-Lambda brand EVS constant current AC-DC power supplies.  The board style 300W rated models can operate without forced air cooling, with the enclosed 600W models having an internal cooling fan.  These five-year warranty power supplies are ideal for charging batteries in energy storage systems, or for other applications requiring constant current outputs such as water purification or plating.

The EVS series will accept a wide 85 to 265Vac input and has nominal 18V (300W only), 36V and 57V outputs for use with 12V, 24V and 48V lithium ion, nickel hydride and lead acid batteries.  The float voltage is user adjustable down to the nominal battery voltage and the charging current can set from 50% to 100% of the rated current.  Parallel operation is possible.

The units can operate in ambient temperatures ranging from -20 to 70oC with model dependent derating.  The 300W supplies measure 3.31” x 1.65” x 7.09” and have an optional perforated cover, with the 600W measuring 4.72” x 2.4” x 7.48”.  A remote on/off function can also be selected on both power levels.

An external stand-alone reverse protection module is also available, preventing backflow of current into the power supply from the battery.  Rated at 20A, 7 to 60Vdc, the EVS-RP6020 uses a low resistance MOSFET to reduce the voltage drop to less than 200mV.  This module is available as a board assembly or with a mounting bracket, measuring 1.97” x 1.02” x 3.05” and 2.36” x 1.26” x 3.68” respectively.

The power supplies have 3kVac input to output, 2kVac input to ground and 500Vdc output to ground isolation.  All are certified to UL/CSA/IEC/EN 60950-1 and carry the CE mark for the Low Voltage and RoHS2 Directives.  The EVS complies with EN55011/EN55022-B conducted emissions and the IEC 61000-3-2 harmonics and IEC 61000-4 immunity standards.

More information can be obtained at the following TDK-Lambda Americas website,, or by calling 800-LAMBDA-4.  Product availability for the EVS series can be found via the link to TDK-Lambda’s distributor network (see “Check Distributor Stock”) at


Major applications

Charging batteries for energy storage systems, water purification, plating, and other applications requiring constant current operation.

Main features and benefits

  • User adjustable float voltage and constant current settings
  • Convection and forced air models
  • Five-year warranty
  • Reverse current protection module

Major specifications


About TDK Corporation

TDK Corporation is a leading electronics company based in Tokyo, Japan. It was established in 1935 to commercialize ferrite, a key material in electronic and magnetic products. TDK's portfolio includes electronic components, modules and systems* marketed under the product brands TDK and EPCOS, power supplies, magnetic application products as well as energy devices, flash memory application devices, and others. TDK focuses on demanding markets in the areas of information and communication technology and consumer, automotive and industrial electronics. The company has a network of design and manufacturing locations and sales offices in Asia, Europe, and in North and South America. In fiscal 2016, TDK posted total sales of USD 10.2 billion and employed about 92,000 people worldwide.

* The product portfolio includes ceramic, aluminum electrolytic and film capacitors, ferrites, inductors, high-frequency components such as surface acoustic wave (SAW) filter products and modules, piezo and protection components, and sensors.

About TDK-Lambda

TDK-Lambda Corporation, a group company of TDK Corporation, is a leading global power supply company providing highly reliable power supplies for industrial equipment worldwide. TDK-Lambda Corporation meets the various needs of customers with our entire range of activities, from research and development through to manufacturing, sales, and service with bases in five key areas, covering Japan, Europe, America, China, and Asia.

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Editorial Contact:

Tom Tillman, Director of Marketing
TDK-Lambda Americas Inc.
401 Mile of Cars Way, Suite 325
National City, CA 91950
Ph: 619-575-4400