Class II encapsulated power supplies operate in high ambient temperatures

TDK Corporation announced the introduction of the KWS-A series of single output 5W to 25W encapsulated power supplies capable of operating in ambient temperatures of up to 85ºC.  With a Class II input, the products require no earth-ground connection, making them suitable for use in a range of process control, broadcast, test & measurement and industrial equipment.


The board-mount product lineup comprises four power levels, 5 W, 10 W, 15 W and 25 W, and is housed in three compact package sizes. The 5W and 10W units measure 38.1 x 25.4 x 21.5 mm, the 15 W 50.8 x 25.4 x 24 mm and the 25 W models 63.5 x 25.4 x 29 mm. Four popular output voltages are available, 5 V, 12 V, 15 V and 24 V, and all operate from a wide range input voltage of 85 – 265 Vac, 47 – 440 Hz.


The KWS-A can start up at -40ºC and operate without forced air cooling in ambient temperatures of up to 85ºC and, at full load, over a -10ºC to +55ºC range (+45ºC for the 5 V output 10 W to 25 W models). Off-load power draw is less than 0.5W and full load efficiencies are as high as 88%. Board design is made simpler and space minimized as no external fusing or electrolytic capacitors are required.


The series carries certification to UL/CSA/IEC/EN 60950-1 and the CE mark for the Low Voltage and RoHS2 Directives. All models comply with EN 55011-A conducted and radiated emissions (class B with the addition of a small X-capacitor) and EN 61000-4-2, -6-2 immunity standards.


Visit TDK Corporation to learn more about the TDK-Lambda KWS-A series and the company.

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