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Class II encapsulated power supplies operate in high ambient temperatures

30 June 2016

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

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 5V output 10W to 25W models). Off-load power draw is less than 0.5W and full load efficiencies are as high as 88 percent. Board design is made simpler and space minimised 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.


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